GREISINGER GMH3110 Handheld Digital Pressure Meter User Manual

GREISINGER GMH3110 Handheld Digital Pressure Meter

Product Information

Product Name: Handheld Digital Pressure-Meter GMH3110
Version: 5.1
Manufacturer: Not specified
User Manual: https://manual-hub.com/

General
The Handheld Digital Pressure-Meter GMH3110 is a device designed and tested in accordance with safety regulations for electronic devices. It ensures trouble-free operation and reliability when the standard safety measures and special safety advice provided in the user manual are followed. The device should only be used under the specified climatic conditions mentioned in the specifications to guarantee its trouble-free operation and reliability. It is important to handle the device and sensors with care, protecting plugs and sockets from soiling. When transporting the device from a cold to a warm environment, condensation may cause failure, so precautions should be taken.

Operation And Maintenance Advice
No specific operation and maintenance advice is provided in the given text extract.

Connections
The device has connections for pressure sensors of the GMSD family (refer to Chapter 9 of the user manual) and an electrically isolated interface adapter (refer to Chapter 6 of the user manual). The mains adapter socket is located on the left sideof the device.

Display
The display of the GMH3110 handheld digital pressure meter includes the following information:

• Units: An arrow points to the chosen measuring unit.
• Tara: Appears that Tara function is activated.
• SL: Appears if sea-level correction is activated.
• Main display: Shows the measuring value.
• Secondary display: Shows min-, max-, or hold value.
• Logg: No function.
• AL: No function.

Basic Operation
When switching on the device and after zero point adjustment, it briefly shows “nuLL Corr.” The device has several buttons with specific functions:

• On-/Off-Switch
• Tara: Calling of Tara function for zero point adjustment
• min/max: Showing the min- or max memory in the secondary display
• Store/Quit: Calling of hold function
• Set/Menu: Calling of configuration

Configuration
To change device settings, press the Menu button (key 4) for 2 seconds. This will open the configuration menu. Pressing the Menu button allows navigation between parameters. Parameters can be changed using buttons 5 (key 2) or 6 (key 5). Pressing the Quit button (key 6) finishes the configuration and returns to standard measuring operation.

Unit: Choice Of The Display Unit
The device offers the following display units to choose from bar, bar, Pa, kPa, MPa, bar PSI, SL, Tara, AL, and Logg. The selected unit is permanently stored in the sensor. After reconnecting the sensor, the unit will instantly reappear. The supported units depend on the device and may include [m] =H2O if printed below the display.

Sea Level Correction For Absolute Pressure Sensors
The device displays the absolute pressure measured at the sensor, which may differ from the values given by weather stations. Weather stations provide pressure values at sea level. Since the sensor is usually placed above sea level, the pressure loss resulting from the actual level above zero needs to be considered when measuring the value at sea level (zero).

Note : The provided information is based on the given text extract from the user manual. For complete and accurate instructions, please refer to the official user manual.

General Safety Requirements

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 advice given in this manual are 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”.

2. Devices and sensors have to be handled with care (don’t throw, hit, etc.). Protect plugs and sockets from soiling.

3. If the device is transported from a cold to a warm environment condensation may cause 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.

4. If the device is to be connected to other devices (e.g. via serial interface) the circuitry has to be designed most carefully. Internal connection in third-party devices (e.g. connection GND and earth) may result in not-permissible voltages impairing or destroying the device or another device connected.
   Warning : If the device is operated with a defective mains power supply (e.g. short circuit from mains voltage to output voltage) this may result in hazardous voltages at the device (e.g. at the sensor socket or interface).

5. 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 restarting.
   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 period of time.
     In case of doubt, please return the device to the manufacturer for repair or maintenance.

Operation And Maintenance Advice

Battery Operation
If !! and ´bAt´ are shown in the secondary display the battery has been used up and needs to be replaced. The device will, however, operate correctly for a certain amount of 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 the device above 50°C. Please note: We recommend taking out the battery if the device is not used for a longer period of time!

Mains Operation With Power Supply
Warning : 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.

Connecting/Changing Sensors

• Do not use unsuitable sensors. Connecting other devices/sensors as specificated may cause damage to the instrument and device/sensor! Switch off the device before changing the sensor.
• Connect the sensor before switching on the device, otherwise, the sensor may not be detected correctly. When connecting the sensor the connector may not lock correctly. In such a case take the plug not at the casing but at the buckling protection at the end of the plug. If the plug is entered correctly, it will slide in smoothly. To disconnect the sensor do not pull at the cable but at the plug (to open the locking mechanism).

Connections

Display

Basic Operation
When switching on the device and a zero point adjustment was carried out it shows shortly nuLL Corr.

• Max Memory: Pressing ´max´ (key 2) shows the maximum of the measured values. Pressing it again hides it. To clear the max memory press key ´max´ for >2 seconds.

• Min Memory: Pressing ´min´ (key 5) shows the minimum of the measured values. Pressing it again hides it. To clear the min memory press key ´min´ for >2 seconds.

• Hold Function: By pressing ´Store/Quit´ (key 6) the last measuring value will be held in the secondary display. Pressing it again hides it.

• Tare Function: By pressing ´Tara´ (key 3) the display will be set to 0. All measurements from then on will be displayed relative to the set tare value. When Tara function is activated, the arrow “Tara” appears in the display. To deactivate tare function press ´Tara´ for >2 seconds.
  Please Note: Activating/deactivating Tara clears the max- & min-memories.

• Zero-Point Adjustment: (for real. pressure sensors only) If there is no pressure applied to the pressure ports the device will display 0. If there is a permanent deviation (and the device is operated under steady conditions), a permanent zero-point adjustment can be carried out. To carry out the adjustment press key 3 for 5 seconds.
  ( Please note: A zero-point adjustment can only be carried out if the difference between the value on display and the value calibrated on site is less than 2%! E.g. for the measuring range of 1.00 ..+25.00mbar, =>zero-point adjustment up to 0.50mbar possible) To recall the manufacturer‘s calibration press button 3 for approx. 7 seconds.
  Note : If a zero-point adjustment was carried out, this will be signaled by the short displaying of NuLL Corr when switching on the device.

Configuration

• To change device settings, press Menu (key 4) for 2 seconds. This will be called the configuration menu. Pressing the key Menu jumps between the parameters.
• The parameters can be changed with 5 (key 2) or 6 (key 5).
• Quit (key 6) finishes the configuration and returns to standard measuring operation.

Unit: Choice Of The Display Unit

• Choose the desired display unit, the referring unit is displayed by means of a functional arrow in the display. The selection is permanently stored in the sensor, therefore after reconnecting the sensor the unit will instantly reappear. The choice depends on the used sensor.
  The unit [m] =H2O is just supported by devices with [m] printed below the display!

Sea Level Correction For Absolute Pressure Sensors
The device displays the absolute pressure measured at the sensor. This is not necessarily the same like the values given by weather stations! The weather stations values are pressure at sea level. Usually the sensor is placed above sea level and therefore, if the value at sea level(zero) is to be measured, the pressure loss resulting from the actual level above zero has to be considered!

• To correct and activate the Sea-Level-Function:
  Select on in the menu SL with 5 (key 2) or 6 (key 5).

• Jump to the next parameter Alti by pressing Menu (key 4).
  Then enter the altitude above sea level of the sensor location in meters and leave the configuration by pressing Quit (key 6)

If the sea level correction is active this will be shown by the functional arrow SL in the display, the device now displays the absolute pressure at sea level (zero).

P.oFF: Auto Power Off Time

• The device will be automatically switched off if no key is pressed/no interface communication takes place for the time of the power-off time.
  The power-off time can be set to values between 1 and 120 min. It can be completely deactivated by setting the parameter to P.oFF = oFF.

Adr: Base Address of Interface

• Up to 10 devices of the GMH3xxx- family can be connected to a serial interface at once (depending on the interface converter, e.g. GRS3105: 5 devices). To get access to each device the base addresses of the devices have to be different. For example choose 01 for the first, 11 for the second device, and so on.

Measuring Of Water Level Display Unit [m]

(only for devices with m printed below the display)
When using a suitable waterproof pressure sensor the unit [m] for meters of water can be set in the menu Unit. 10m of water are roughly 1 bar over pressure. Measurings can be made e.g. like described below :

• With abs. pressure sensor (SL oFF!): Press Tara when the sensor is at ambient air and then bring the sensor to the depth to be measured. The display shows now the depth in [m].
• With real pressure sensor: bring tube connection for the lower press. in contact to ambient air by means of a tube (no water contact!) and bring the sensor with its open press. connection for higher pressure to water depth to be measured (display and is compensated for pressure changes in ambient air).

Calibration Services

• Calibration certificates  DKD-certificates  other certificates:
• If the device should be certificied for its accuracy, it is the best solution to return it with the referring sensors to the manufacturer.
• Only the manufacturer is capable of doing efficient recalibration if necessary to get results of the highest accuracy!

Pressure Connection To The Sensors

The device is designed to be connected to the sensors of the GMSD…-series without a new calibration being necessary. Therefore a great variety of replaceable sensors of e.g. 1.999…2.500 mbar relative up to 0…400.0 bar absolute pressure can be connected to the device (p.r.t. chapter 9)

Relative Pressure Sensors (Types: GMSD…MR. GMSD…BR)

• For measurements of over- or under-pressure:
  Connect plastic tube with internal dia of 4 mm to pressure port “B”. Port “A” will not be used!
  Pressure sensors GMSD 2,5 MR, GMSD 25 MR, and GMSD 350 MR allow for measurements of under pressure up to the entire over-pressure measuring range by re-plugging the tube to pressure port “A”. Please note that all values are displayed as positive values. No minus sign will be shown. (Example for GMSD 25 MR: For tube connection “B” the measuring range covers -19.99 to 25.00 mbar. If you replug to port “A” under pressure measurements down to -25.00 mbar could be carried out with the display showing the value 25.00 (no minus sign).

• For measurements of pressure differences:
  Connect both plastic tubes with an internal dia of 4 mm to pressure ports “B” and “A”; make sure to apply higher pressure to port “B”.

Absolute pressure sensors: (types: GMSD…BA)

• Connect plastic tube with an internal dia of 4 mm to pressure port “A”. (Port “B” is not used.)
• Stainless steel pressure sensors: (types: GMSD…MRE, GMSD…BRE, GMSD…BAE)
• For measurements of over-, under- or absolute pressure screw the sensor to the G1/4″ pressure terminal or plug the plastic tube into a suitable adapter.

The Serial Interface

By means of the serial interface and a suitable electrically isolated interface adapter (GRS3100, GRS3105 or USB3100) 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 GRS3100, GRS3105 or USB3100). To avoid transmission errors, there are several security checks implemented e.g. CRC.
The following standard software packages are available:

• EASY CONTROL : Universal multi-channel software (EASYBUS-, RS485-, or GMH3000- operation possible) for real-time recording and presentation of measuring data of one GMH3xxx device in theACCESS®-database format

In case you want to develop your own software we offer a GMH3000-development package including:

• a universally applicable Windows functions library (’GMH3000.DLL’) with documentation
• Programming examples Visual Basic 4.0, Testpoint (Keithley Windows measuring software)

Note : The measuring and display range values read back from the interface are always in the selected measurement unit (mbar, bar…)!

Supported functions:

Error And System Messages

Mains operation without battery: wrong voltage

| Replace battery

Check power supply, replace it when necessary

| No sensor connected| Switch off the device and connect the sensor
Connected sensor or device defective| If a second sensor is available, check if the device is ok Return the defective device/sensor to the manufacturer for repair
Err 9| Measured value far out of allowable range| Check: Is pressure not within sensor range?
No display or confused characters, device does not react on keypress| Battery empty

Mains operation without battery: wrong voltage or polarity

System error

Device defective

| Replace battery

Check the power supply, and replace it when necessary

Disconnect the battery and power supplies, wait shortly, then reconnect

Return to manufacturer for repair

Err 1| Measured value above allowable range

Sensor defective

| Check: Is pressure not within sensor range?

-> measuring value to high

Return to manufacturer for repair

Err 2| Measured value below allowable range

Sensor defective

| Check: Is pressure not within sensor range?

-> measuring value to low

Return to manufacturer for repair

Err 4| Value is too low to be displayed, Tara is set| Check: display below -2000 (tara?)?
Err 7| System error| Return to manufacturer for repair

Specification

Measuring ranges:

• Display range: max. -1999…9999 digits, depending on the connected sensor
• Resolution: depending on the connected sensor
• Pressure units: mbar, bar, kPa, MPa, mmHg, PSI mH2O (only for devices with m printed below the display), selectable depending on the connected sensor
• Accuracy: (typ.) ±0,1%FS (at nominal temperature) (FASt and P.dET: ±0.5%FS)
• Measuring rate: 4 meas./sec
• Nominal temperature: 25°C
• Sensor: All sensors of the GMSD..-series without recalibration can be connected
• Connection: Mini-DIN-Socket with locking mechanism The sensor will automatically be detected, and the measurement range settings are set referring to sensor data
• Power-Off-Function: The device will be automatically switched off if no key is pressed/no interface communication takes place for the time of the power-off delay. The power-off delay can be set to values between 1 and 120 min.; it can be completely deactivated.
• Display: 2 four-digit LCDs (12.4mm high and 7 mm high) for measuring values, and for min/ max memories, hold function, etc. as well as additional functional arrows.
• Pushbuttons: 6 membrane keys
• Interface: Serial interface (3.5mm jack) can be connected to the RS232 interface of a PC via electrically isolated interface adapter GRS3100, GRS3105, or USB3100 (see accessories).
• Power supply: 9V battery, type: IEC 6F22 (included in the scope of supply) 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: Slow measuring rate: < 1.5 mA
• Low battery warning:! -display and ’ bAt ’
• Housing: impact-resistant ABS, membrane keyboard, transparent panel, Front side IP65
• Dimensions: 142 x 71 x 26 mm (L x W x D)
• Working temperature: -25…+50°C
• Allowable rel. humidity: 0…95 % RH (not condensing)
• Storage temperature: -25…+70°C
• EMC: The device corresponds to the essential protection ratings established in the Regulations of the Council for the Approximation of Legislation for the member countries regarding electromagnetic compatibility (2004/108/EG).
• Additional fault: <1%

Sensors

(03/2005)

• Description A: Sensor is suitable for air, corrosive and non-ionising gases and liquids Pressure connection: 2 nylon pressure ports for connection to 6 x 1 mm tubes Housing ABS with mounting eyelet, dimensions 68 x 32.5 x 27.5 mm
• Description B: Stainless steel sensor. Suitable for aggressive media, water, etc. Pressure connection: Threading G¼”, for open-ended spanner size: 27 mm Housing ABS, dimensions ca. Ø26 (31) x 103 mm
• Description C: Stainless steel sensor. Suitable for aggressive media, water, etc. Pressure connection: Threading G¼”, for open-ended spanner size: 27mm Steel housing, dimensions ca. 26 (31) x 110 mm

Accessories

• GKK3000 Suitcase (275 x 229 x 83 mm) with punched lining suitable for the GMH3xxx series.
• GKK3100 Suitcase (275 x 229 x 83 mm) with foam lining for universal applications.
• GMH1300 Magnet holder
• GAK9V Rechargeable accu 9V
• GLG1300 Accu charger for recharging 2 accus at one time
• GNG10/3000 power supply 10V/10mA
• GRS3100 Interface converter, electrically isolated
• GRS3105 5-way interface converter, electrically isolated
• GAM3000 Control device for GMH3xxx-devices with alarm function
• EBS9M 9-channel software to display the measuring values
• GMH3000.DLL universally applicable Windows functions library (’GMH3000.DLL’) with documentation for your own software applications

References

• Manual-Hub.com – Free PDF manuals!

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