GREISINGER GMUD MP Pressure Transducer Instruction Manual

GREISINGER GMUD MP Pressure Transducer

• Read carefully before first operation!
• Consider safety instructions!
• Keep for future reference!

General note

Any task should exclusively be performed by subject-specific qualified personnel. The skilled personnel should carefully read and understand the manual before using the device. Keep this document in reach for reference in case of any doubt. The liability and warranty of the manufacturer for damages and consequential damages expires with unintended use, failure to observe these operating instructions, non-observance of safety instructions, insufficiently skilled qualified personnel or unauthorized modifications to the device.

Safety

Intended use
The transducers of the GMUD MP series are exclusively suitable for:
Transducing of (depending on device type) differential, relative or absolute pressure (within the pressure range specified on the identification plate meets all specifications in 9 Specification on page 14 and 10 Sensor accuracies on page 15) into an electrical signal (adjustable, 4..20 mA or 0..10 V). Any other use is not intended!

Qualified staff
For operating, running, maintaining and commissioning the device, the staff needs to have an adequate level of knowledge of both, the measuring and the meaning of measured values. This manual can be a valuable contribution. All instructions have to be well-understood and complied with. To be sure that there is no risk arising due to misinterpretation of measured values, the operator must have further knowledge in case of doubt – the user is liable for any harm/damage resulting from misinterpretation due to insufficient knowledge. 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.’

Safety signs and symbols
Warning notices are marked in this manual as shown below:

• 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 points out processes that can indirectly influence operation or provoke unforeseen reactions at non-observance.

Suitability
The operator is responsible for verifying that the product is suitable for the desired application. In case of doubt please contact our sales and marketing department. The GHM-Messtechnik GmbH is not liable for incorrect choice, mounting, configuration or connection and any result obtained from this!

Reasonably foreseeable misuse

• This device must not be used at potentially explosive areas!
• The transducer must not be used at a patient for diagnosis or any other medical purpose!
• The differential pressure transducers must not be used as safety pressure monitors for fireplace, exhaust- or ventilating systems!
• Do not use this product as a safety or emergency stop device or in any other application where the failure of the product could result in personal injury or material damage.

Any failure to comply with these instructions could result in death, serious injury and material damage.

Safety instructions
This device has been designed and tested by 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.

During configuration
When transporting the device from a colder to a warmer ambience condensation may cause a malfunction. In that case, before operating, it is needed to wait until the device temperature has aligned to the ambience. The conceptual design, particularly when connecting with other devices has to be done thoroughly. Internal connections of other devices (e.g. from the ground with protective earth) may lead to prohibited voltage levels that could disturb the function, damage or even destruct the device or any connected equipment. Never run the device with a damaged or faulty power supply. Risk of death by electrocution!

During normal operation
Whenever there may be 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 the manufacturer for repair or maintenance (with costs). After exceeding the specification an inspection or repair at charge at the manufacturer’s site is necessary. Tubes, connectors or the sensor element inside the device could be damaged due high pressure or temperature. These damages can (even at a later time) lead to functional disorder.

Product Description

Scope of supply
GMUD MP with one elbow-type plug (2 with option /OUT) Mounting and operating manual GMUD MP Unit labels (depending on type)

Operating and maintenance
Treat the device and sensor carefully. Use only under above specification. (Do not throw, hit against etc.). Protect plug and socket from soiling.

• Supply connection/mains operation: When connecting a mains cable, please take care to connect only allowed components. Carefully check the polarity and the correct connection. Don’t apply overvoltage! The device contains no serviceable parts inside. In case of errors or malfunction please return the device to the manufacturer for repair or maintenance (with costs).

Type plate

Available options

• Option WE: The factory pre-configuration can be changed manually. Carefully check the configuration before every commissioning.
• Hint for option -OD: Open cover for having access to display and buttons

General installation instructions

• All screws and fittings have to be tightened finger tight.
• Any cable used must fulfil the correct function of strain relief.
• It’s only permitted to use cables with sufficient cable cross-section.
• Cables with visible optical or mechanical damage have to be replaced immediately by faultless ones.
• The device operation is only permitted with closed housing, signal- and supply lines being correctly wired, screwed connector sockets with correctly attached connector seal and with pressure lines being correctly connected and secured to prevent accidental releasing.

Wall mounting
For wall mounting loosen screws (A). Remove cover (B) from base (D). Wall mounting screws (C) are not included. The mounting-hole-diameter is 4.2 mm. See pattern drilling above (50 x 70 mm)

Connector mounting

Release the screw (1). Unplug the connector. Release the connection sealing, cable fitting (2), shim (3) and sealing-ring (4). Pull out the connection socket (6). Thread cable through parts (2), (3), (4) and into connector housing (5). Connect wires according to wiring diagram on page 8. Reattach part (6) in (5). According to the mounting situation select the best of the 4 possible positions. Reattach parts (4) and (3) and tighten (2). Plug in the connector with connection sealing and tighten (1).

Pressure connection
 Left pressure port: Higher pressure (+) Right pressure port (if available): Lower pressure (-) Depending on the pressure and pressure tube a securing for accidental removing is needed (recommendation: GDZ-18 or GDZ-19)

Commissioning
Unpack the device, and accessories and check scope of supply (maybe the packing still contains some parts). Mount the device according to general mounting instructions permanent and safe. Attach non-active power supply. Carefully check the connection (supply and signal) Connect transistor output with circuitry or detector (only with option /OUT). Now activate the power supply. Configure the device (Settings, output …). Check transistor output. Carefully check the normal operation mode of the output (“output in case of an error”): When exceeding the range, according to configuration the output can change from 20 mA to < 3.6 mA! On a control chain a vent control would keep the vent open! In that case, the normal operation mode of the output must be set to > 20 mA to close the vent. Check the correct function of the notification chain (only with option /OUT). Mount the pressure tubes and secure the tube from accidental removal. Now apply process pressure.

Decommissioning
Turn off the process pressure and wait until the pressure has fallen to 0. Unplug the pressure tubes after that unplug the supply and all circuitry. Demount device.

Ready for operation
Right after turning on the device will perform a self-diagnostic check (about 5 sec.) During this time, all display segments are active and the output is in an error state. After the check, the device will change in measuring mode and is ready for use.

Connection

Connection for the elbow-type plug (according to device configuration)  Only with option /OUT Connector left side DC-isolated switching output, switching to GND. Threshold settings via configuration menu Connector right side Supply and signal output Current- or voltage signal selectable via menu.

• The cable length on the transistor output must not exceed 3 m and must not leave parts of the building!
• An appropriate external surge protection (e.g. in case of direct/indirect lightning stroke) must be installed when using cable length > 30 m, when the cabling is leaving parts of the building or when using on a central direct current feed-in.

Otherwise the following applies

• The cables for 0..10 V and 4..20 mA must not leave parts of the building!
• The cables for 0..10 V and 4..20 mA must not exceed a length of 30 m!

Display

Keypad

Configuration

Follow these instructions to configure the functions of the device:

• Press button SET until the first parameter becomes visible in the.
• Switch to the desired parameter by pressing the button SET.
• Use the button ▲ or ▼ to change a value and use button SET to validate the value.

If there is no key pressed within the menu mode within 2 minutes, the configuration will be cancelled. All changed settings will be lost! Changing the device parameters is password-protected by factory default. The password must be set correctly to 185 for entering the menu. The last menu point gives the option to disable password protection.

Password lock

Output configuration
To achieve best accuracy the output signal should be at least 50 % of the used sensor’s measuring range. Refer to 10 Sensor accuracies on page 15. Setting the output to 0..1 mbar when using a sensor range of -10..10 will extremely decrease the accuracy.

If higher values are needed, please check the sensor, if necessary return to the manufacturer for inspection.

Calculation: corrected value = (measured value – OFFS) * (1+ SCAL /100)

Sea level correction (only for absolute devices)

Atmospheric conditions: international standard atmosphere

Transistor output (only available with option –OUT)

Filter settings

The filter uses the last calculated value and the average over the set period of time. In 100 ms there will be 16 measurements. The new value will then be calculated as an average over the 16 measurements and the last value. When the filter is not active and the fast measuring is active there will be no averaging, each sensor value is displayed and the output will be set to the corresponding signal. This might lead to an output signal and display value that is not smoothly.

Lock settings

Details for pressure measurement

Absolute pressure
Absolute pressure is the pressure referenced to vacuum (zero pressure). With no pressure-charged (pressure port left open), the atmospheric pressure is measured. Application field: meteorological measuring (e.g. 1013 hPa abs), vacuum processes.

Differential pressure
The differential pressure is the difference between 2 pressure levels. Commonly both pressure levels are charged to one side of the sensor membrane, the sensor then needs two pressure ports. Application field: HVAC, filter/air filter, velocity pressure.

Relative pressure
Relative pressure is the differential pressure between a pressure level (over or under pressure) and the atmospheric pressure. For measuring relative pressure with a differential pressure sensor (2 pressure ports) one of the ports has to be left open. Application field: Pneumatic or hydraulic systems, tire pressure.

Error and system messages

Inspection of accuracy/adjustment service

The device uses high-quality sensor elements. However long-term drift, pollution and sediments can cause an inaccuracy (e.g. in offset and scale). A periodic (e.g. once a year) routine inspection and adjustment at the manufacturer’s site (with costs) is recommended to stay within the specified accuracy range. Calibration certificates – NIST-certificates – other certificates: When recalibration is necessary the best accuracy can only achieved by the manufacturer! The device uses high-quality sensors. However long-term drift, pollution and sediments can cause inaccuracy (e.g. errors in offset and scale). A periodic routine inspection and adjustment at the manufacturer’s site is recommended to stay within specified accuracy range.

Reshipment and disposal

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 sensors may be a risk for persons or the 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. Add the completed reshipment form of the GHM website http://www .ghm-messtechnik.de/downloads/ghm-formulare.html The device must not be disposed in the unsorted municipal waste! Send the device directly to us (sufficiently stamped), considering the above if it should be disposed of. We will dispose of the device appropriate and environmentally sound.

Specification

Sensor accuracies

Accuracies with standard measuring ranges

Percent specification relating to whole measuring range at nominal temperature range (0..+70 °C) Lin: typical accuracy deviation due linearity effects (offset and scale)

• T+H: typical accuracy deviation due to temperature and hysteresis effects
• Max.: maximum accuracy deviation

Accuracies with specific measuring ranges

Can be ordered by using option -MBS or -MBF. From the respective range limits any range can be selected. The accuracy of the sensor specifies the system accuracy. The ranges highlighted in the table above show the highest possible accuracy. The minimum display value is -1999 because of the 7-segment display. A +- 500.0 mbar sensor can be ordered as -199.9..500.0 mbar or -500..500 mbar. With intermediate ranges the accuracy will change. The expected accuracy can be calculated as follows: Sensor range / measuring range * Accuracy

• e.g. desired range -10..+600 mbar -> measuring range e: 10 + 600 = 610
• Next sensor -1000..+1000 mbar -> sensor range: 1000 + 1000 = 2000, accuracy = 0.9%
• Accuracy GMUD MP-S-10..+600 = 2000 / 610 * 0.9 % = 2.95 %
• Accuracy without possible EMC effects, refer to 9 Specification on.

GHM GROUP – Greisinger
GHM Messtechnik GmbH | Hans-Sachs-Str. 26 | 93128 Regenstauf | GERMANY Tel.: +49 9402 9383-0 | info@greisinger.de | www.greisinger.de

References

• Senseca Germany GmbH - Business Unit Portable
• Manual-Hub.com – Free PDF manuals!

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