GREISINGER GMH 3710 Precision Termometer For Pt100 4-Wire Temperature Probes Instruction Manual

GREISINGER GMH 3710 Precision Termometer For Pt100 4-Wire Temperature

Probes

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.

Safety

Intended Use
The GMH 3710 is a precision thermometer for the measurement of the temperature with exchangeable 4-wire 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”).

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 non-observance.
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.

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.
2. 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.
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.This device must not be run with a defective or damaged power supply unit. Danger to life due to electrical shock!
4. 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.
5. 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.
6. This device is not constructed for use in medical applications.

Product Specification

Scope of supply
The scope of supply includes:

• device with 9V battery block
• Operation manual

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. If ‘bAt’ 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 temperature 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.

Handling

Display

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.

Basic Operation

On / Off
+min/max at measure: press short: shows the min./max. value press 2 sec.: clears particular value up/down in configuration: manual input/change of values
Tara: no function
Set/Menu: press 2 sec.: invokes configuration menu
Store/Quit: measure: hold-function, the last measuring value will be held in the secondary display.
at menu: acknowledge setting, return to measurements.

Connections

Pop-up clip

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.

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. Start Operation
Connect Temperature probe, turn on device via key.
After segment test the device displays some configuration:
• If a zero point adjustment was carried out the display shows shortly „nuLL Corr“. After that the device is ready for measuring

Configuration
To change device settings, press Menu (key 4) for 2 seconds. This will call the configuration menu. Choose between the individual parameter that can be set by pressing the Menu again.
The parameter values can be changed with (key 2) or (key 5). Quit (key 6) finishes the configuration, store the values and returns to standard measuring operation.

ºC, ºF

|

Unit : Selection of temperature Unit

|

0.1ºC, 0.01ºC,

Auto

|

Resolution : Selection of Display Resolution

| -2.50 … 2.50 ºC

respectively

-4.50 … 4.50 ºF

| The zero point of the measurement will be displaced by this value to compensate for deviations in the temperature probe or in the measuring device
oFF| Zero displacement inactive (=0.0°)
|

-2.000 … 2.000

| The scale of the measuring will be changed by this factor to compensate for deviations in the temperature probe or in the measuring device (factor is in %)
off| Factor deactivated (=0.000)
|

1 … 120

| Auto Power-Off delay in minutes

Device will be automatically switched off as soon as this time has elapsed if no key is pressed/no interface communication takes place

oFF| Auto Power-Off deactivated

(continuous operation, e.g. mains operation)

|

SEr, dAC

| Output: function of output, serial interface, analogue output
oFF| No output function, lowest power consumption
|

01, 11 … 91

|

Base address of device for interface communication

| -200.0…850.0 ºC

respectively

-328.0. 1562.0°F

| Enter desired temperature value at which the analogue output potential should be 0V
| -200.0…850.0 ºC

respectively

-328.0. 1562.0°F

| Enter desired temperature value at which the analogue output potential should be 1V

Hint : The settings will be set to the settings ex works, if keys ‘Set‘ and ‘Store‘ are pressed simultaneously for more than 2 seconds.

Remarks to Special Features

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.

Output
The output can be used as serial interface (for USB 3100, USB 3100 N, GRS 3100 or GR S3105 interface adapters) or as analog output (0-1V). If none of both is needed, we suggest to switch the output off, because battery life then is extended.

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 GRS3105 up to 5 devices of the GMH3xxx- series can be connected to one interface (see also manual of GRS3105). 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:

• 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 6.0™, Delphi 1.0™, Testpoint™, Labview™
    Note : The measuring and range values read via interface are always in the selected display unit (°C/°F)!

Supported interface functions:

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.

Input Adjustment

Zero Displacement (‘Offset’)

A zero displacement can be carried out for the measured temperature: 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.

Scale Correction (‘Scale’)

The scale of the measuring can be influenced by this setting (factor is in %): displayed temperature[°C] = measured temperature[°C] (1+Scal/100) respectively displayed temperature[°F] = (measured temperature [°F]-32°F) (1+Scal/100) + 32°F Standard setting: ‘off’ =0.000, i.e. temperature is nor corrected. Together with the zero displacement (see
above) this factor is mainly used to compensate for sensor deviations. Unless the factor is set to ‘off’, the Corr arrow in the display shows an active scale correction..

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!

Probe Connection

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

2- or 3-wire connections

It is also possible to connect an 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. The connection of these probes should be carried out as follows:

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.

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 thin film
B -196 to +600 °C -50 to +500 °C
A -100 to +450 °C -30 to +300 °C
AA (= 1/3 B) -50 to +250 °C 0 to +150 °C
1/10 B (= 1/10 B) -50 to 100 °C

Error band for Pt 100 thin film 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!

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.

Fault and System Messages

battery
If mains operation: wrong voltage| Check/replace power supply, if fault continues to exist: device damaged
 | Low battery voltage| Replace battery
If mains operation: wrong voltage| Check/replace power supply, if fault continues to exist device damaged
No display Or

Weird display

Device does not react on keypress

| Low battery voltage| Replace battery
If mains operation: wrong voltage| Check/replace power supply, if fault continues to exist device damaged
System error| Disconnect battery or power supply, wait some time, re-connect
Device defective| Return to manufacturer for repair
—-| Sensor error, no sensor connected| Connect sensor to socket
Sensor/cable or device defective| Return to manufacturer for repair
Err.1| Value exceeding measuring range| Check: Is the value exceeding the measuring range? Temperature too high!
Wrong probe connected| Check probe
Sensor/cable defective| Replace
Err.2| Value below display range| Check: Is the value below the measuring range? Temperature too low!
Wrong probe connected| Check probe
Sensor/cable defective| Replace
Err.3| Value exceeding display range| Set resolution to 0.1° or Auto
Err.4| Value below display range| Set resolution to 0.1° or Auto
Err.7| System error| Return to manufacturer for repair

Reshipment and Disposal

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.

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.

Specifications

Supported probes

Sensor Curve Probe connection

| Pt100 4-wires (2-wire possible) According to EN60751

4-pole Mini-DIN socket

|
---|---|---
Resolution| 0.01°C                      0.1°C| 0.01°F| 0.1°F
Measuring Ranges| -199.99…199.99      -200.0…850.0| -199.99…199.99| -328.0…1562.0

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