GREISINGER GMH 3750 Precision Thermometer User Manual
- June 6, 2024
- GREISINGER
Table of Contents
GMH 3750 Precision Thermometer
H49.0.02.6C-12
Precision thermometer
for Pt100 4-wire temperature probes
as of version 1.8
operating manual
GMH 3750
GMH 3700 Series
Pt100 Thermometer Hochpräzision / High-Precision
WEEE-Reg.-Nr. DE 93889386
GHM GROUP – Greisinger
GHM Messtechnik GmbH | Hans-Sachs-Str. 26 | 93128 Regenstauf | GERMANY Tel.:
+49 9402 9383-0 | info@greisinger.de | www.greisinger.de
H49.0.02.6C-12
CONTENTS
User’s Guide GMH 3750
page 2 of 16
1 GENERAL NOTE ……………………………………………………………………………………………………………………………………3
2 SAFETY ………………………………………………………………………………………………………………………………………………….3
2.1 INTENDED USE…………………………………………………………………………………………………………………………………….3 2.2 SAFETY SIGNS AND SYMBOLS………………………………………………………………………………………………………………..3 2.3 SAFETY GUIDELINES…………………………………………………………………………………………………………………………….3
3 PRODUCT SPECIFICATION………………………………………………………………………………………………………………….4
3.1 SCOPE OF SUPPLY ………………………………………………………………………………………………………………………………..4 3.2 OPERATION AND MAINTENANCE ADVICE ………………………………………………………………………………………………..4
4 HANDLING …………………………………………………………………………………………………………………………………………….5
4.1 DISPLAY …………………………………………………………………………………………………………………………………………….5 4.2 BASIC OPERATION……………………………………………………………………………………………………………………………….5 4.3 CONNECTIONS …………………………………………………………………………………………………………………………………….5 4.4 POP-UP CLIP ………………………………………………………………………………………………………………………………………..6
5 START OPERATION………………………………………………………………………………………………………………………………7
6 CONFIGURATION …………………………………………………………………………………………………………………………………7
7 REMARKS TO SPECIAL FEATURES ……………………………………………………………………………………………………8
7.1 DISPLAY RESOLUTION………………………………………………………………………………………………………………………….8
7.2 AVERAGE FILTER (,,T.AUG”)………………………………………………………………………………………………………………..8 7.3
ALARM (,,AL.”) …………………………………………………………………………………………………………………………………..8 7.4 USER
SENSOR CURVE (‘LIN USER’)………………………………………………………………………………………………………..9
7.5 REAL TIME CLOCK (,,CLOC”)……………………………………………………………………………………………………………….9
8 OPERATION OF LOGGER…………………………………………………………………………………………………………………….9
8.1 STORING SINGLE MEASUREMENTS (,,FUNC-STOR”)
…………………………………………………………………………………9 8.2 AUTOMATIC RECORDING WITH SELECTABLE CYCLE
TIME ,,FUNC CYCL”……………………………………………….10
9 OUTPUT ……………………………………………………………………………………………………………………………………………….11
9.1 SERIAL INTERFACE …………………………………………………………………………………………………………………………….11 9.2
ANALOGUE OUTPUT SCALING WITH DAC.0 AND DAC.1 ……………………………………………………………………..12
10 INPUT ADJUSTMENT……………………………………………………………………………………………………………………….12
10.1 ZERO DISPLACEMENT (‘OFFSET’)………………………………………………………………………………………………………12 10.2 SCALE CORRECTION (‘SCALE’)………………………………………………………………………………………………………….12 10.3 CALIBRATION SERVICES ………………………………………………………………………………………………………………….12
11 PROBE CONNECTION ……………………………………………………………………………………………………………………..12
11.1 4-WIRE CONNECTIONS……………………………………………………………………………………………………………………..12 11.2 2- OR 3-WIRE CONNECTIONS …………………………………………………………………………………………………………….12 11.3 4-POLIGER MINI DIN PLUG ………………………………………………………………………………………………………………13
12 SOME BASICS OF PRECISION TEMPERATURE MEASURING……………………………………………………..13
13 FAULT AND SYSTEM MESSAGES …………………………………………………………………………………………………..14
14 RESHIPMENT AND DISPOSAL ………………………………………………………………………………………………………..15
14.1 RESHIPMENT ………………………………………………………………………………………………………………………………….15 14.2 DISPOSAL INSTRUCTIONS…………………………………………………………………………………………………………………15
15 SPECIFICATIONS……………………………………………………………………………………………………………………………..16
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User’s Guide GMH 3750
page 3 of 16
1 General Note
Read this document carefully and get used to the operation of the device
before you use it. Keep this document within easy reach near the device for
consulting in case of doubt.
Mounting, start-up, operating, maintenance and removing from operation must be done by qualified, specially trained staff that have carefully read and understood this manual before starting any work.
The manufacturer will assume no liability or warranty in case of usage for other purpose than the intended one, ignoring this manual, operating by unqualified staff as well as unauthorized modifications to the device. The manufacturer is not liable for any costs or damages incurred at the user or third parties because of the usage or application of this device, in particular in case of improper use of the device, misuse or malfunction of the connection or of the device.
2 Safety
2.1 Intended Use
The GMH 3750 is a precision thermometer for the measurement of the temperature
with exchangeable 4wire Pt100 temperature sensors. With high resolution and
precision temperature values can be measured from -200 to 850 °C. The device
is to be protected against wetness and soiling and has to be stored and
operated only within the permissible environmental conditions and connection
data (see “Specification”).
2.2 Safety signs and symbols
Warnings are labelled in this document with the followings signs:
Caution! This symbol warns of imminent danger, death, serious injuries and
significant damage to property at nonobservance.
Attention! This symbol warns of possible dangers or dangerous situations which
can provoke damage to the device or environment at non-observance.
Note! This symbol point out processes which can indirectly influence operation
or provoke unforeseen reactions at non-observance.
2.3 Safety guidelines
This device has been designed and tested in accordance with the safety regulations for electronic devices. However, its trouble-free operation and reliability cannot be guaranteed unless the standard safety measures and special safety advises given in this manual will be adhered to when using the device.
1. Trouble-free operation and reliability of the device can only be guaranteed if the device is not subjected to any other climatic conditions than those stated under “Specification”. If the device is transported from a cold to a warm environment condensation may cause in a failure of the function. In such a case make sure the device temperature has adjusted to the ambient temperature before trying a new start-up.
- DANGER
If there is a risk whatsoever involved in running it, the device has to be switched off immediately and to be marked accordingly to avoid re-starting. Operator safety may be a risk if: – there is visible damage to the device – the device is not working as specified – the device has been stored under unsuitable conditions for a longer time. In case of doubt, please return device to manufacturer for repair or maintenance.
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User’s Guide GMH 3750
page 4 of 16
3. When connecting the device to other devices the connection has to be designed most thoroughly as internal connections in third-party devices (e.g. connection GND with protective earth) may lead to undesired voltage potentials that can lead to malfunctions or destroying of the device and the connected devices.
_DANGER
4.
_DANGER
5.
DANGER
6.
This device must not be run with a defective or damaged power supply unit.
Danger to life due to electrical shock!
Do not use these products as safety or emergency stop devices or in any other
application where failure of the product could result in personal injury or
material damage. Failure to comply with these instructions could result in
death or serious injury and material damage. This device must not be used at
potentially explosive areas! The usage of this device at potentially explosive
areas increases danger of deflagration, explosion or fire due to sparking.
This device is not constructed for use in medical applications.
DANGER
3 Product Specification
3.1 Scope of supply
The scope of supply includes:
device with 9V battery block Operation manual
3.2 Operation and maintenance advice
Battery operation If bAt’ is shown in the lower display the battery has been used up and needs to be replaced. However, the device will operate correctly for a certain time. IfbAt’ is shown in the upper display the voltage is too
low to operate the device; the battery has been completely used up. The
battery has to be taken out, when storing device above 50 °C. We recommend
taking out battery if device is not used for a longer period of time. After
recommissioning the real-time clock has to be set again.
· Mains Operation with power supply When using a power supply please note that
operating voltage has to be 10.5 to 12 V DC. Do not apply overvoltage!! Cheap
12V-power supplies often have excessive no-load voltage. We, therefore,
recommend using regulated voltage power supplies.
Trouble-free operation is guaranteed by our power supply GNG10/3000. Prior to
connecting the power supply to the mains make sure that the operating voltage
stated at the power supply is identical to the mains voltage.
Treat device and sensor carefully. Use only in accordance with above
specification. (do not throw, hit against etc.). Protect plug and socket from
soiling.
To disconnect temperatur sensor plug do not pull at the cable but at the plug.
When connecting the probe the plug will slide in smoothly if plug is entered
correctly.
Selection of Output-Mode: The output can be used as serial interface or as
analogue output. This choice has to be done in the configuration menu.
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4 Handling
4.1 Display
User’s Guide GMH 3750
page 5 of 16
1 Maindisplay: Currently measured temperature 2 Secondary display: Display of
min, max or hold values Special display elements: 3 Min/Max/Hold: shows if a
min., max. or hold value is
displayed in the auxiliary display
4 “Offset” arrow: indicates that zero point offset is activated 5 ,,Corr”
arrow: indicates that a scale correction is activated
6 ,,Logg” arrow: Shown if logger function is selected, flashes if cyclic
logger is running
7 ,,Alarm” arrow: Flashes if alarm is present
4.2 Basic Operation
ON
Tara
OFF max
1
2
3
Set min Store
Menu
4
5
Quit
6
4.3 Connections
On / Off
min/max at measure:
press short:
press again:
shows the min./max. value hides min./max. value
press 2 sec.:
clears particular value
Tara Function only during configuration:
3
Selection of menu-parameter
Set/Menu: press short: Store/Quit: press short:
at active logger: at menu:
invokes configuration menu
hold-function, the last measuring value will be held in the secondary display.
invokes logger functions acknowledge setting, return to measurement
Output:
Connection for el. Isolated interface adapter or for analog output (please refer to chapter 9)
Probe connection: 4 pole Mini-DIN-Socket, for Pt100 4-wire probes
Power supply: the mains adapter socket is located at the left side of the device.
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4.4 Pop-up clip
User’s Guide GMH 3750
page 6 of 16
Handling: · Pull at label “open” in order to swing open the pop-up clip. · Pull at label “open” again to swing open the pop-up clip further.
Pop-up clip closed
Pop-up clip at position 90° Pop-up clip at position 180°
Function:
· The device with a closed pop-up clip can be plainly laid onto a table or
attached to a belt, etc. · The device with pop-up clip at position 90° can be
set up on a table, etc. · The device with pop-up clip at position 180° can be
suspended from a screw or the magnetic holder
GMH 1300.
Device attached to a belt
Device set up on a table
Device suspended from magnetic holder GMH 1300
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User’s Guide GMH 3750
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5 Start Operation
ON
Connect temperature probe, turn on device via
OFF
1
key.
After segment test
the device displays some configuration:
· If the logger function is not off, the time of the integrated clock will shortly be displayed. · If a zero point adjustment was carried out, the display shows shortly ,,nuLL Corr”.
After changing the battery the clock-setting menu is activated automatically (,CLOC`). Check the clock and adjust, if necessary (p.r.t. chapter 6).
After that, the device is ready for measuring.
6 Configuration
To change device settings, press Menu (key 4) for 2 seconds. This will call the configuration menu (main display: ,,SEt” or “rEAd LoGG”). Pressing key Menu changes between the menus, pressing ( (key 3) jumps to the referring parameters, which can be selected with key ( (key 3). The parameters can be changed with (key 2) or (key 5). Pressing Menu again jumps back to the main configuration menu and saves the settings. Quit (key 6) finishes the configuration and returns to standard measuring operation.
Menu(*1) ,Menu`
Parameter/Values(2*)
Meaning
or
Read Logg: single value-logger read out
(Only when data existing! Please refer to chapter 12)
p.r.t. 8
Set Configuration: Generic Settings
°C:
All temperature values are in degrees Celsius
°F:
All temperature values are in degrees Fahrenheit
0.1° / 0.01°:
Resolution 0.1° / 0.01°
- 7.1
Auto:
Resolution is selected automatically
E.751
characteristic curve according to EN60751
- 7.4
USEr
User sensor curve (Predefined to EN60751 values,
changeable by software GMHKonfig)
-2.50…2.50°C / Zero correction
- 10.1
-4.50…4.50°F
oFF:
Zero displacement inactive (=0.0°)
-2.000…2.000: Scale correction [in %]
- 10.2
oFF:
Scale correction factor inactive (=0.000)
1…30: oFF:
Average filter (period in seconds) Average filter inactive
- 7.2
1…120
oFF oFF: SEr: dAC: 01,11..91
Power-off delay in minutes. Device will be
automatically switched off as soon as this time has
elapsed if no key is pressed or no interface
communication takes place
Power-off function inactive (continuous operation)
No output function
9
Output is serial interface
Output is analogue output
Base address of device for interface communication
9.1
-200..850°C / Zero point of analogue output: Temperature at
9.2
328…1562°F which the analogue output potential should be 0V
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-200..850°C / -328…1562°F
User’s Guide GMH 3750
page 8 of 16
Scale of analogue output : Temperature value at
9.2
which the analogue output potential should be 1V
Set Alarm: Setting of Alarm Function
On / No.So
Alarm on with horn-sound / Alarm on without horn-
7.3
sound
OFF
no alarm function
-200°C …AL.Hi Min alarm rail (not when AL. oFF)
AL.Lo … 850°C Max alarm rail (not when AL. oFF)
Set Logger: Setting of Logger Function
CYCL
Cyclic: logger function cyclic logger
Stor
Store: logger function individual value logger
OFF
No logger function
0:01… 60:00
Cycle time of cyclic logger [minutes:seconds]
Set Clock: Einstellen der Echtzeituhr
HH:MM
Clock: Setting of time hours:minutes
YYYY
Year
- 8 * 8
7.4
TT.MM
Date: day.month
(*) Hint:
If the logger memory contains data already, the menus/parameters marked with
(*) can not be invoked! If these should be altered the logger has to be
stopped and the memory has to be cleared before!
Restoring of ex-works settings The settings will be set to the settings ex
works, if keys Set and Store are pressed simultaneously for more than 2
seconds.
7 Remarks To Special Features
7.1 Display Resolution
Standard setting: ‘Auto’, i.e. the device automatically switches over to the
optimum resolution between .01° and 0.01°. If temperatures to be measured are
near the switching threshold, a fixed resolution may be better, e.g. for easy
manual recording. In such a case please set the optimum resolution to the
desired value.
7.2 Average filter (,,t.AuG”)
The filter forms the arithmetic floating average over the entered time. The
displayed value will be correspondingly slower in this case.
7.3 Alarm (,,AL.”)
There are three possible settings: Alarm off (AL. oFF), on with horn sound
(AL. on), on without horn sound (AL. no.So). Following conditions will display
an alarm, when the function is activated (on or no.So): – Value is below lower
(AL. Lo) or above upper alarm rail (AL.Hi). – Sensor error – Low battery (bAt)
– Err.7: System error (always with sound) In case of an alarm and when polling
the interface the “prio”-flag is set in the returned message.
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User’s Guide GMH 3750
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7.4 User Sensor Curve (‘Lin USEr’)
By means of this function besides the standard conversion of resistance to temperature following EN60751(Lin E.751) also other curves can be used. The user sensor curve can be read and edited by the configuration software GMHKonfig. The standard setting ex works is also set to the EN60751 data. The curve is defined by a table with two columns (input resistance [Ohm]/output temperature [°C]) with 50 rows. Info: the sensor curve following EN60751 uses the international temperature scale ITS90 and following formulas:
Temperatures < 0°C:
Rneg(T) := 100 · [1 + 3.9083·10-3·T 5.775·10-7·T2 4.183·10-12·(T 100)·T3]
Temperatures >= 0°C:
Rpos(T) := 100 · (1 + 3.9083·10-3·T 5.775·10-7·T2)
Please notice: Temperature measurements with the user sensor curve are allowed only within the temperature range, which has been used to generate the user sensor curve. Measuring with activated user sensor curve beyond the checked temperature range may lead to larger errors. Therefore the sensor curve acc. to EN 60751 (Lin E.751) has to be used for temperature measurements beyond the checked temperature range.
7.5 Real Time Clock (,,CLOC”)
The real time clock is used for the logger function: Recorded values are also
containing the point of time, when they were measured. Please check the
settings when necessary. If the battery was replaced the referring menu ,CLOC`
will automatically be started
8 Operation Of Logger
The device supports two different logger functions: ,,Func-Stor”: manual
recording via keypress “Store” (key 6). ,,Func-CYCL”: automatic recording with
the selected recording interval/cycle
The logger records 1 measurement result each time
The data set consists of: – measuring value at time of recording
– time and date of recording
For the read out and evaluation of the data the software GSOFT3050 (V1.7 or
higher) has to be used. The software also allows easy configuration and
starting of the logger.
When the logger is activated (Func Stor or Func CYCL) the hold function is no
longer available, key 6 is solely used for the operation of the logger
functions.
8.1 Storing Single Measurements (,,Func-Stor”)
a) Record Measuring:
If the logger function “Func Stor” was activated (see chapter
6″Configuration”), up to 99 measuring data sets can be recorded manually.
Press shortly: Data set will be recorded (“St. XX” will be shown shortly. XX
is the number of the data set)
If the logger memory is full, the display will show: b) Viewing Recorded
Measurings:
Stored data sets can be either read out via PC Software GSOFT3050, or be
viewed in the display directly. Press for 2 seconds: The display will show:
Please note: “rEAd Logg” only appears, if there are already data stored! If memory is empty, the
configuration menu
will show.
Press shortly: Changing between measuring value and date+time of data set
or
Changing between the data sets
Exit logger data display
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User’s Guide GMH 3750
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c) Clear recorded measurings:
If there are already data sets stored, these can be deleted via the store key:
Press for 2 seconds: Calling of clear-Menu
Change selection by:
or
:
Clear nothing (cancel menu)
Clear all recordings
Clear the last recording
Stores the settings
8.2 Automatic Recording With Selectable Cycle Time ,,Func CYCL”
If the logger function “Func CYCL” was activated (see chapter 6
“Configuration”), and the logger was started, it automatically records data
sets at intervals of the selected logger cycle time The logger cycle time is
selectable from 1s to 60min (see chapter 6 “Configuration”).
Max. number of measurings:
16384
a) Starting a recording:
press for 2 seconds: the recording will be started.
Each recodring is signales with a short diplay of `St.XXXXX’. XX is the number
of the data set. If the logger memory is full, the display will show b) Stop
the recording:
Press for 2 seconds: If a recording is running, the Stop menu will be shown
Change selection by:
or
:
Do not stop the recording
Stop the recording
Stores the settings
Note:
If you try to switch off the instrument in the cyclic recording operation, You will be asked automatically if the recording should be stopped. The device can only be switched off after the recording has been stopped! The Auto-Power-Off- function is deactivated during recording!
c) Clear recorded measurings:
Press for 2 seconds: If logger data are present and the recording was stopped, the clear menu will be shown
Change selection by:
or
:
Clear nothing (cancel menu)
Clear all recordings
Stores the settings
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User’s Guide GMH 3750
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9 Output
The output can be used as serial interface (for USB 3100, USB 3100 N, GRS 3100 or GRS 3105 interface adapters) or as analogue output (0-1V). If none of both is needed, we suggest to switch the output off, because battery life then is extended.
9.1 Serial Interface
By means of the serial interface and a suitable electrically isolated interface adapter (USB 3100, USB 3100 N, GRS 3100 or GRS 3105) the device can be connected to a computer for data transfer. With the GRS 3105 up to 5 devices of the GMH3xxx- series can be connected to one interface (see also manual of GRS 3105). As a precondition the base addresses of all devices must not be identical, make sure to configure the base addresses accordingly (refer menu point “Adr.” in chapter 6). To avoid transmission errors, there are several security checks implemented e.g. CRC.
The following standard software packages are available for data transfer:
GSOFT3050:
Operating and evaluation software for instruments with integrated logger function
EBS20M/ -60M: 20- / 60-channel software to record and display the measuring values
GMHKonfig:
Software for a comfortable configuration of the device (e.g. freeware)
In case you want to develop your own software we offer a GMH3000-development package including
– an universally applicable 32bit Windows functions library (‘GMH3000.DLL’) with documentation that can
be used by all ‘serious’ programming languages.
– Programming examples for Visual Studio 2010 (C#, C++), Visual Basic 6.0TM, Delphi 1.0TM, TestpointTM,
LabviewTM
In addition to the operation at a PC the device can be operated with the GAM3000-device, to use the alarm function for simple supervision and controlling applications. Just connect a GAM3000 to the interface, activate the alarm function of the GMH and the relays output is operating.
Supported interface functions:
code 0 3 6 7 12 22 23 32
name / function Read nominal values Read system status Read min. values Read max values Read ID-no Read min. alarm rail Read max. alarm rail Read configuration flag Alarm function: 1, Alarm horn: 3 BitLoggerOn: 50, BitCyclicLogger: 51
102 Set min. alarm rail 103 Set max. alarm rail 160 Set configuration flag (see 32) 174 Delete min. value 175 Delete max. value 176 Read min. measuring range 177 Read max. measuring range 178 Read measuring range unit 179 Read measuring range decimal point 180 Read measuring type 194 Set display unit 199 Read measuring type in display 200 Read min. display range
code 201 202 204 208 214 215 216 217 222 223 224 225 226 227 228 229 231 233 234 236 240 254 260
name / function Read max. display range Read unit of display Read decimal point of display Read channel count Read scale correction Set scale correction Read zero displacement Set zero displacement Read power off time Set power off time Logger: read data cyclic logger Logger: read cycle time (LoGG – CYCL) Logger: set cycle time (LoGG – CYCL) Logger: start recording Logger: read # of data Logger: read status Logger: read stop time Read real time clock (CLOC) Set real time clock (CLOC) Read logger memory size Reset Read program identification Logger: read data manual logger
Note: The measuring and display range values read via interface are always in the selected display unit (°C/°F)!
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9.2 Analogue Output Scaling with DAC.0 and DAC.1
Note: Analogue output can not be used during logger recordings
With the DAC.0 and DAC.1 values the output can be rapidly scaled to your efforts. Keep in mind not to connect low-resistive loads to the output, otherwise the output value will be wrong and battery life is decreased. Loads above ca 10kOhm are uncritical. If the display exceeds the value set by DAC.1, then the device will apply 1V to the output If the display falls below the value set by DAC.0, then the device will apply 0V to the output In case of an error (Err.1, Err.2, no sensor, etc.) the device will apply slightly above 1V to the output.
plug wiring:
GND +Uout
Attention! the 3rd contact has to be left floating! Only stereo plugs are allowed!
10 Input Adjustment
10.1 Zero Displacement (‘Offset’)
The zero displacement is used to adjust the measuring display for probe
deviations. temperature displayed = temperature measured – offset
Standard setting: ‘off’ = 0.0°, i.e. no zero displacement will be carried out.
Together with the scale correction (see below) this factor is mainly used to
compensate for sensor deviations. Unless the factor is set to ‘off’, the
offset arrow in the display shows an active zero displacement.)
10.2 Scale Correction (‘Scale’)
The scale correction is used to adjust the measuring display for probe
deviations. (factor is in %): displayed temperature[°C] = measured
temperature[°C] (1+Scal/100)
or: displayed temperature[°F] = (measured temperature [°F]-32°F)
(1+Scal/100) + 32°F Standard setting: ‘off’ =0.000, i.e. temperature is not
corrected. Unless the factor is set to ‘off’, the Corr arrow in the display
shows an active scale correction.)
*) The standard curve (Lin E.751) and the user sensor curve (Lin USEr) possess separate correction settings.
10.3 Calibration Services
Calibration certificates DKD-certificates other certificates: If device
should be certificated for its accuracy, it is the best solution to return it
to the manufacturer. Only the manufacturer is capable to do efficient
recalibration if necessary to get results of highest accuracy!
11 Probe Connection
11.1 4-wire connections
The device is constructed and optimised for the connection of a Pt100 4-wire
probe via 4 pole Mini-Din connectors.
4-wire connection
Figure shows upon probe jack pins
11.2 2- or 3-wire connections
It is also possible to connect a 3- or 2-wire probe to the device. Please
observe that in consequence of the cable and contact resistance an increased
measuring fault will occur.
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The connection of these probes should be carried out as follows:
3-wire connection
2-wire connection
Pt100
11.3 4-pole Mini DIN plug
It is also possible to attach a 4-pin mini-DIN plug with lock for self- assembly. Article: MINIDIN 4S.
12 Some Basics Of Precision Temperature Measuring
Probe Precision/Device Precision
The device is very precise (please refer to technical data).
To be able to use this high precision, the connected temperature probe has to be as precise as possible, too.
The following precision classes are available as a standard at reasonable prices (Platinum resistor
thermometers according to EN60751):
Tolerance class Norm
max. deviation in Kelvin
B
IEC 751 / EN 60751 ± (0,30 + 0,00500 · |temperature|)
A
IEC 751 / EN 60751 ± (0,15 + 0,00200 · |temperature|)
AA (= 1/3 B)
IEC 751 / EN 60751 ± (0,10 + 0,00167 · |temperature|)
1/10 B (= 1/10 B) none
± (0,03 + 0,00050 · |temperature|)
The range of validity depends on the design of the sensor. Wire wound sensors allow wider temperature ranges than economic thin film sensors (further restrictions may result from product-specific properties, such as cables or connection technology)
Tolerance class wire wound
B
-196 to +600 °C
A
-100 to +450 °C
AA (= 1/3 B)
-50 to +250 °C
1/10 B (= 1/10 B)
thin film -50 to +500 °C -30 to +300 °C 0 to +150 °C -50 to 100 °C
Error band for Pt 100 thin film sensors:
Error band for wire wound Pt 100 sensors:
For applications demanding higher precision than given by these classes we
suggest to adjust the device to the used probe or to get a DAkkS or ISO
calibration certificate for the device combined with the probe. Attention: if
an adjusted or calibrated probe is replaced, also the adjustment or
calibration certificate has to
be renewed to maintain the referring overall precision! Be careful when buying
third party temperature probes: Besides the standard EN 60751 there are some
other obsolete or unusual standards on the market. If such a probe has to be
connected, the user sensor curve (have a look to the referring chapter) can be
used to adjust the instrument!
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4-Wire-Measuring
When using resistance thermometers as the Pt100 a quite large measuring error
can be caused by inadequate cables and connections. Using 4wire measuring
avoids this kinds of errors mainly caused by unwanted resistances. It is
suggested to use suitable probes and extensions only.
Heat loss caused by probe construction:
Especially when measuring temperatures which deviate very much from the
ambient temperature, measuring errors often occur if the heat loss caused by
the probe is not considered. When measuring fluids therefore the probe should
be emerged sufficiently deep and be stirred continuously. When measuring gases
the probe should also emerge as deep as possible in the gas to be measured
(e.g. when measuring in channel/pipes) and the gas should flow around the
probe at sufficient flow.
Measuring surface temperature
If temperature of the surface of an object has to be measured, one should pay
attention especially when measuring hot (or very cold) surfaces, that the
ambient air cools (or heats) the surface. Additionally the object will be
cooled (or heated) by the probe or the probe can have a better heat flow to
the ambient temperature as to the objects surface. Therefore specially
designed surface probes should be used. The measuring precision depends mainly
on he construction of the probe and of the physics of the surface itself. If
selecting a probe try to choose one with low mass and heat flow from sensor to
handle. Thermally conductive paste can increase the precision in some cases.
Allowable temperature range of probes
Pt100 Sensors are defined over a wide temperature range. Depending on probe
materials and sort of sensor (e.g. hybrid sensors, wire wound resistors…) the
allowable temperature ranges have to be considered. Exceeding the ranges at
least causes a wrong measuring, it may even damage the probe permanently!
Often it also has to be considered, that the temperature range is just valid
for the probe tube, (plastic-) handles can’t stand the same high temperatures.
Therefore, the tube length should be selected long enough, that temperature
keeps low at the handle.
Self-heating
The measuring current of the instrument is just 0.3mA. The resulting in
practice sensor heating even small sensor elements can be neglected.
Cooling by evaporation
When measuring air temperature the probe has to be dry. Otherwise, the cooling
due to the evaporation causes too low measuring.
13 Fault and System Messages
Display
Meaning Low battery voltage, device will continue to work for a short time If mains operation: wrong voltage
Low battery voltage If mains operation: wrong voltage
Remedy Replace battery
Check/replace power supply, if fault continues to exist: device damaged
Replace battery Check/replace power supply, if fault continues to exist device
damaged
No display Or
Weird display
Low battery voltage If mains operation: wrong voltage
System error Device does not react on keypress Device defective
—-
Sensor error, no sensor connected
Sensor/cable or device defective
Err.1
Value exceeding measuring range
Err.2
Wrong probe connected Sensor/cable defective Value below display range
Err.3 Err.4 Err.7
Wrong probe connected Sensor/cable defective Value exceeding display range Value below display range System error
Replace battery Check/replace power supply, if fault continues to exist device damaged Disconnect battery or power supply, wait some time, re-connect Return to manufacturer for repair Connect sensor to socket Return to manufacturer for repair Check: Is the value exceeding the measuring range? Temperature too high! Check probe Replace Check: Is the value below the measuring range? Temperature too low! Check probe Replace Set resolution to 0.1° or Auto Set resolution to 0.1° or Auto Return to manufacturer for repair
H49.0.02.6C-12
User’s Guide GMH 3750
page 15 of 16
14 Reshipment and Disposal
14.1 Reshipment
All devices returned to the manufacturer have to be free of any residual of
measuring media and other hazardous substances. Measuring residuals at housing
or sensor may be a risk for persons or environment
Use an adequate transport package for reshipment, especially for fully
functional devices. Please make sure that the device is protected in the
package by enough packing materials.
14.2 Disposal instructions
Batteries must not be disposed in the regular domestic waste but at the
designated collecting points.
The device must not be disposed in the unsorted municipal waste! Send the
device directly to us (sufficiently stamped), if it should be disposed. We
will dispose the device appropriate and environmentally sound.
H49.0.02.6C-12
User’s Guide GMH 3750
page 16 of 16
15 Specifications
Supported probes Sensor Curve Probe connection Resolution Measuring Ranges
Pt100 4-wires (2-wire possible)
according to EN60751 or with user-sensor curve (table of 50 rows)
4-pole Mini-DIN socket
0.01°C
0.1°C
0.01°F
0.1°F
-199.99…199.99 -200.0…850.0
-199.99…199.99 -328.0…1562.0
Precision Device without probe ±1Digit (at nominal temperature)
Range 0.01°C/F ±0.03 °C / ±0.06 °F
Range 0.1°C/F ±0.1 °C / ±0.2 °F
Measuring
4-wire measuring with thermo-voltage compensation, measuring current 0.3 mA
Measuring rate:
2 measurements per second
Temperature influence <= 0.002 K per 1K
Nominal temperature 25 °C
Ambient condition -25 … +50 °C (-13 … +122 °F), 0 to 95 %RH (not condensing)
Storage temperature -25 … +70 °C (-13…158 °F)
Output: serial interface: analog output:
3.5 mm audio plug, stereo output configurable to serial interface or to analog
output
via optically isolated interface adapter USB 3100, USB 3100 N, GRS 3100 or GRS
3105 (accessory) connectable to PCs with USB- or RS232-interfaces.
0..1V, freely scalable (resolution 13 bit,accuracy 0.05% at nominal
temperature), cap. load < 1 nF
Power Supply:
9V-Battery (included) as well as additional d.c. connector (diameter of internal pin 1.9 mm) for external 10.5-12V direct voltage supply. (Suitable power supply: GNG10/3000)
Power Consumption Output off
approx. 0.90 mA
Output = serial interface approx. 1.15 mA
Analog output
approx. 1.25 mA
Display: Pushbuttons:
Two 4 ½ digits LCD’s (12.4mm and 7 mm high), additional segments 6 membrane keys
Min-/Max-Memory Both the max. and the min. value will be memorised.
Holdfunction
Press button to store current value.
Automatic-Off-Function Device will be automatically switched off if not operated for longer time (adjustable
from 1 … 120 min)
Min/Max-Alarm
The measuring value is constantly monitored for the min and max rails. Alarming is done by integrated horn, display and interface
Real time clock
integrated clock with date and year
Logger
2 Functions: individual value logger (,,Stor”) and cyclic logger (,,Cycl)
Memory
Stor: 99; Cycl: 16384
Cycle-time CYCL 0:01 … 60:00 (minutes/seconds, min 1s, max 1h)
Housing:
Dimensions: Weight:
impact-resistant ABS plastic housing, membrane keyboard, transparent panel. Front side IP65, integrated pop-up clip for table top or suspended use. 142 x 71 x 26 mm (L x B x D) approx. 155 g
Directives / standards: The instruments confirm to following European
Directives: 2014/30/EU EMC Directive 2011/65/EU RoHS
Applied harmonized standards: EN 61326-1 : 2013 emissions level: class B, emi
immunity acc. to table 3 and A.1 Additional fault: <1% EN 50581 : 2012