GREISINGER GMH 5150 User manual

H82.0.02.6C-03
GREISINGER electronic GmbH
WEEE-Reg.-Nr. DE 93889386
as of version 1.0 GMH 5150
Operating Manual
Handheld Pressure-Meter
water-proof, with data logger
Please carefully read these instructions before use!
Please consider the safety instructions!
Please keep for future reference!

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Index
1GENERAL NOTE......................................................................................................................................................3
2SAFETY......................................................................................................................................................................3
2.1 INTENDED USE.......................................................................................................................................................3
2.2 SAFETY SIGNS AND SYMBOLS................................................................................................................................3
2.3 SAFETY GUIDELINES..............................................................................................................................................3
3PRODUCT SPECIFICATION..................................................................................................................................4
3.1 SCOPE OF SUPPLY ..................................................................................................................................................4
3.2 OPERATION AND MAINTENANCE ADVICE..............................................................................................................4
4HANDLING................................................................................................................................................................5
4.1 DISPLAY ELEMENTS...............................................................................................................................................5
4.2 PUSHBUTTONS.......................................................................................................................................................5
4.3 CONNECTIONS .......................................................................................................................................................5
5START OPERATION................................................................................................................................................6
6CONFIGURATION...................................................................................................................................................6
7REMARKS TO SPECIAL FEATURES ..................................................................................................................9
7.1 DIFFERENT PRESSURE UNITS ................................................................................................................................9
7.2 DIFFERENT KINDS OF MEASURING.........................................................................................................................9
7.3 WATER DEPTH /LEVEL MEASUREMENT.................................................................................................................9
7.4 SEA-LEVEL CORRECTION FOR ABSOLUTE PRESSURE SENSORS............................................................................10
7.5 AVERAGING FUNCTION........................................................................................................................................10
7.6 CALC: PRESSURE CHANGE PER TIME DP/DT.......................................................................................................10
7.7 CALC: PITOT MEASURING OF VELOCITY AND FLOW .........................................................................................11
8DATA LOGGER......................................................................................................................................................12
8.1 MANUAL RECORDING (“FUNC-STOR”) ...............................................................................................................12
8.2 AUTOMATIC RECORDING WITH SELECTABLE CYCLE TIME (“FUNC CYCL“).....................................................13
9UNIVERSAL OUTPUT...........................................................................................................................................15
9.1 INTERFACE...........................................................................................................................................................15
9.2 ANALOG OUTPUT.................................................................................................................................................16
10 INPUT ADJUSTMENT........................................................................................................................................16
11 PRESSURE CONNECTION TO THE SENSORS............................................................................................16
12 ALARM (“AL.”) ...................................................................................................................................................17
13 REAL TIME CLOCK (“CLOC”).......................................................................................................................17
14 ACCURACY CHECK / ADJUSTMENT SERVICE ........................................................................................17
15 REPLACING BATTERIES.................................................................................................................................17
16 ERROR AND SYSTEM MESSAGES................................................................................................................18
17 RESHIPMENT UND DISPOSAL.......................................................................................................................18
17.1 RESHIPMENT ....................................................................................................................................................18
17.2 DISPOSAL INSTRUCTIONS.................................................................................................................................18
18 SPECIFICATIONS...............................................................................................................................................19

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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.
The manufacturer is not liable for misprints.
2 Safety
2.1 Intended Use
This device must only be used with one GMSD- K51or MSD Epressure sensors.
Other usages are not intended.
The safety requirements (see below) have to be observed.
The device must be used only according to its intended purpose and under suitable conditions.

Protect the device from dirt.
2.2 Safety signs and symbols
Warnings are labeled in this document with the followings signs:
DANGER
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.
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.

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

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.
3 Product Specification
3.1 Scope of supply
The scope of supply includes:
GMH 5150 with 2 AAA batteries
Operation manual
Short form manual
3.2 Operation and maintenance advice
1. Battery operation:

the 
low to operate the device; the battery has been completely used up. Battery change: p.r.t. chapter 15.
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.
2. Mains operation
The output voltage of a connected power supply unit has to be between 4.5 and 5.5 V DC.

3. Treat device and sensor carefully. Use only in accordance with above specification. (do not throw, hit
against etc.). Protect plug and socket from soiling.
4. Connecting/changing sensors
Use only sensors of GMSD ... - K51 or MSD - series!
Other sensors may lead to damage to the device and the sensor.
Switch off device before changing the sensor.
The sensors are coupled to the instrument via bayonet connectors
To connect a sensor, plug in the connector in the right position and then rotate the ribbed ring ½ turn.
To disconnect rotate the ribbed ring ½ turn and then pull out the connector.
_DANGER
_DANGER
_DANGER
_DANGER

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4 Handling
4.1 Display elements
1 Main display: measuring value
2 Secondary display:display of minimum / maximum /
memorized measuring value 
3 Arrows for selected measuring unit
4 Rating of battery status
5 Display elements to show minimum / maximum / memorized
measuring value as well as tare-function and sea-level-
correction
6 user arrow: measuring value is shown in freely adjustable
user-unit (please refer to chapter 7.1)
7 corr arrow: zero-point or slope correction is active
8 logg arrow: logger is ready
arrow flashing: automatic recording (Logg CYCL) is active
4.2 Pushbuttons
On / off key, backlight
press shortly: activate backlight or switch on instrument
press longer: switch off instrument
set / menu:
press shortly: display change:
show calculated value
7.6 and 0
press for 2 sec. (menu): invoke configuration menu
min / max:
press shortly: min. or max. value is displayed
press for 2 sec: the corresponding value is deleted
press shortly: tare-function: display is set to 0. All measuring
values are displayed relatively to this set tare-
value from now on.
press for 2 sec: deactivate tare-function
store / enter:
Logger off: 
displayed)
(Logger on: Operation of data logger - chapter 8)
(Set/Menu: confirm settings, return to measuring)
4.3 Connections
Universal output: interface, supply, analog output
(p.r.t. chapter 9 )
7-pole bayonet socket: connection for sensor

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5 Start Operation
Connect sensors, turn device on via key.
After segment test the device displays some configuration:
if standard measurement is selected
if fast measurement is selected
if peak value detection is selected
After that the device is ready for measuring.
6 Configuration
Some menu points depend on current device settings (e.g. some points are locked if logger
memory contains data sets).
To change device settings, press “menu” for 2 seconds. This will activate the configuration menu (main
“menu” changes between the menus points, pressing jumps to the
referring parameters, which can be selected with key .
The parameters can be changed with or .
Pressing “menu” again jumps back to the main configuration menu and saves the settings.
“enter” finishes the configuration and returns to standard measuring operation.

to factory defaults.
If there are data sets stored an
8 Data Logger
If no key is pressed for more than 2 minutes the configuration will be aborted. All changes will
not be saved!
Menu Parameter Value Description
or
Set Configuration: General configurations
Unit: Select measuring unit *,**
Arrow to bar,
mbar …Measuring value is displayed in corresponding unit, the selectable
units depend on connected sensor
Arrow to “user” Measuring value is displayed in freely adjustable user-unit
bar, mbar 
0000, 000.0,
….0000“ -unit selected)
-19999...19999 
Sea Level: Sea-level correction *,**
oFF Sea-level correction off
on Sea-level correction on (p.r.t. 7.4)
-2000 ... 9999 Sea-level in [m] *,**
Rate: Measuring rate *
Slo Slow measuring rate (4 Hz filtered, low power consumption)
FASt Fast measuring rate, filtered (1000 Hz)
P.dEt Peak detection: fast measuring rate, unfiltered (1000 Hz)

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Averaging Filter *
1 …120 Averaging period in seconds
oFF Averaging function is deactivated
Auto Power-Off: Select power-off delay
1 ... 120 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 Automatic power-off function deactivated (continuous operation)
Background illumination
oFF Illumination deactivated
5 … 120 Turn off illumination after 5 
on Illumination always on
Set Calculation: Calculated display values *
Choice of function
oFF No calculated display
dP:dt Pressure change per time (leak rate measurements, ...)
SPEd Flow speed measurement with pitot tube etc.
FLo Volumetric flow rate measurement with pitot tube etc.
“dP:dt”: Settings
Time unit of pressure change rate
Per.S Pressure change rate unit per second, e.g. mbar/s
Per.n Pressure change rate unit per minute, e.g. mbar/min
Per.h Pressure change rate unit per hour, e.g. mbar/h
Test period, for which the pressure change rate is calculated
0:01... 1:00 Period in [minutes:seconds], ex works: 1s
SPEd” or “Flo”: Settings
SPEd: speed unit
n:S meter per second, m/s
kn:h kilometer per hour, km/h
nPh miles per hour, mph
knot knots
FLo: Volumetric flow unit
n3:s cubic meter per second, m3/s
n3:n cubic meter per minute, m3/min
n3:h cubic meter per hour, m3/h
L:S liter per second, l/s
L:n liter per minute, l/min
FLo: Volumetric flow - cross section
10.0 …1999.9,
2000 …14000 cross section in cm2
0.1000 ...
1.9999 coefficient,(Prandtl pitot tube = 1.0000 please refer to
chapter 7.7)
-100.0 ... 1000.0
°C air flow temperature
100.0 ... 1999.9
mbar ambient pressure
0000, 000.0 …
00.00 decimal point setting
oFF, 1 …1000 minimum display, below always display 0

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Menu Parameter Value Description
or
Set Output: Universal output adjustments
oFF Interface and analog output off
SEr: Serial interface activated
dAC: Analog output activated
01, 11..91 Base address for serial interface communication
(only at Out = SEr)
sensor dep.
e.g.-5.00..5.00 mbar Zero-point setting for Out = dAC: Measuring value which should
correspond to output 0 V
sensor dep.
e.g.-5.00..5.00 mbar Slope setting for Out = dAC: Measuring value which should
correspond to output 1 V
Set Corr: Input adjustment *
Zero adjustment/offset of sensors *
oFF No zero adjustment of sensors
Sensor dep.
e.g.-5.00..5.00 mbar The offset of sensor will be displaced by this value to compensate
for deviations of the probe or of the measuring device.
Slope adjustment of sensors *
oFF No slope adjustment of sensor
-2.000 …
2.000 The slope of sensor will be changed by this factor [%] to
compensate deviations of probe or measuring device
Set Alarm: Settings for alarm function
On/No.So Alarm on, with/without buzzer
OFF No alarm function
Sensor-Min
... AL.Hi Min-alarm-limit sensor (not if AL. = oFF)
Sensor-Min is lower display range limit of sensor
AL.Lo ...
Sensor-Max Max-alarm-limit sensor (not if AL. = oFF)
Sensor-Max is upper display range limit of sensor
Set Logger: Settings for logger function *
Selection of logger function *
CYCL Cyclic: cyclic logger
Stor Store: manual recording
oFF No logger activated
0:01 .. 60:00 Cycle time in [minutes: seconds] (for cyclic logger) *
on/oFF Low-power-logger with low power consumption
(only for cyclic logger and slow measuring rate) *
Set Clock: Settings for real time clock
HH:MM Clock: set time hours: minutes
YYYY Year: set year
TT.MM Date: set date day. month
rEAd Logg: Read calibration data:
p.r.t. chapter 8.1 Manual Recording (“Func-Stor”)
(*) If logger memory contains data sets parameters marked with (*) cannot be called. You
have to clear memory to change these parameters! (button 6, p.r.t. chapter 8)
(**) Parameter can only be called if corresponding sensor is plugged.

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7 Remarks to Special Features
7.1 Different Pressure Units
Depending on the connected sensors different units can be selected via menu (Unit). The measuring range
of the sensors may restrict the choice!
User-Unit
For pressure units, which are not covered by the ones printed on the display, there can be done a manual
- unit.
Example:
To enable a GMSD 2 BR - K51 ( -1000 2000 mbar) to display the unit kg/cm2, following settings (bold)
have to be entered:
kg/cm2Torr atm at
bASE user: bar mbar bar bar
DP user: .0000 .0000 .0000 .0000
FACt user: 1.0197 .7433 0.9869 1.0197
7.2 Different kinds of measuring
Three different kinds of pressure measuring are supported. Two of them (P.dEt and FASt) are working with
high measuring frequency of more than 1000 measurings per second.
7.2.1 Standard measuring (slow)
Measuring rate 4 Hz, averaging and filter functions are active.
Application: Measuring of slowly changing or static pressures, e.g. measuring of leakproofness,
atmospheric pressure...
Highest accuracy, high noise immunity, low power consumption.
7.2.2 Peak detection (Peak detection)
Measuring rate >1000 Hz, the value is displayed unfiltered.
Application with logger function: Measuring of short pressure peaks or fast changing pressures with
a resolution of <1 ms. The cyclic logger function records the arithmetic mean value, the highest and
the lowest peak of the referring time interval.
Attention: higher power consumption, measuring is sensitive to noise (EMI, ...).
Measuring is sensitive to noise (EMI, ...)
and higher power consumption.
7.2.3 Fast filtered measuring (fast)
Measuring rate >1000 Hz, but the value is filtered (higher noise immunity than P.dEt, small peaks
will be filtered out), apart from that identical behavior like rAtE-P.dEt.
7.3 Water depth / level measurement
Water-proof sensors have to be used for water depth / level measurement.
Select the unit [m] for meters water column (selection mH2O) in menu 10 m water column (=water
depth) corresponds roughly 1 bar overpressure.
Measurings can be made e.g. like described below: (for abs. pressure sensors SL has to be deactivated)
With an abs. pressure sensor:  when sensor is at ambient air and then bring sensor to the
depth to be measured. The display shows now the depth in [m].
With a rel. pressure sensor: bring tube connection for lower press. in contact to ambient air by means of
a tube (no water contact!) and bring the sensor with its open pressure connection for higher pressure to
water depth to be measured (display and is compensated for pressure changes in ambient air).

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7.4 Sea-level correction for absolute pressure sensors
The device displays the absolute pressure. This is not necessarily the same like the values given by weather
stations! The weather stations are displaying the pressure at sea level. Usually the sensor is placed above
sea level and therefore the pressure loss resulting from the actual level above sea level has to be
considered, if the value at sea level (zero) should be measured! To correct the measuring display, activate
-Level- (SL, p.r.t. chapter 6, setting is only possible, if an abs. pressure sensor is
connected). Then enter the altituds location in meters (Alti, p.r.t. chapter 6).
When activated, the display shows the SL-arrow and the device displays the pressure value at sea level.
7.5 Averaging function
The averaging function concerns the display values (LCD and interface).
It is completely independent from the averaging of the logger function FASt and P.dEt!
The averaging integrates the measuring values during a selectable period of time and then calculates the
average display value. It is independent from the selected kind of measuring (slow, fast, peak detect).
As long as not enough values have been collected (i. e. for the selected averaging time) to calculate an
average value----
During an active low-power-logging procedure the averring is always deactivated.
Function of min/max-value memory during averaging:
- If averaging is activated and slow measuring is selected (rAtE-Slo), the min-/max-value memory refers to
the average display value.
-If averaging is activated and fast measuring is selected (rAtE-FASt or P.dEt), the min-/max-value memory
refers to the internal measured values (fast peaks can be detected).
7.6 CALC: Pressure change per time dP/dt

measuring intervals (t.int) can be freely chosen. The device automatically saves pressure values during this

and historical data.
Tare button: Historical data is deleted, calculation restarts.
Example: Tightness testing for sewage ducts according to EN 1610 with requirements less than -3 mbar/min in a
5 minutes test duration at a test pressure of 250 mbar
Equipment/presetting:
•Sealing bladder and pressure pump
•Sensor: GMSD 2 BR - K51 (measuring range -1000 … +2000 mbar)
•bASE= Pet.n (minutes) time unit for pressure change rate
•t.int = 1:00 (1 minutes) test duration, for which the pressure change rate is calculated
•Logger: Cycl, 5 sek
Procedure:
•Connect all parts, arrange all necessary sealings
•Start logger
•Charge with pressure, wait for sufficient time
•Restart calculation with “tare” button
•Current pressure value is displayed, button “set” changes to dP:dt display
•The display can give some preliminary information about the test result (will it fail the test?)
•Release pressure after 5 minutes
•Stop logger
Evaluation:
Read out data logger with GSOFT3050, input at register “comment”:
Client, place of inspection, date, time, address / duct number, as-built data (duct type, nominal size, etc), test
instructions, pressures, tolerances, etc. as well as test result.
Therefore a comment sample can be prepared as file, company logo etc. can be added for printing.

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t.int- setting: If there are set high values the displayed values can be easily misinterpreted,
because the displayed value responds very slowly.
The displayed value is calculated: P(Tcurrent) P(Tcurrent -t.int) / T.int
If there are not data for the whole t.int-period yet the values are extrapolated with the already
available data.
7.7 CALC: Pitot measuring of Velocity and Flow
7.7.1 Velocity measurement in air: “CALC SPEd”
The air velocity is calculated by means of the pressure difference at a Prandtl pitot tube or comparable
measuring setup.
with
v = velocity (m/s)
p = dynamic pressure (Pa) => p(A)-p(B) = measured pressure difference
s = pitot tube factor (= 1.0 for Prandtl pitot tube) value input at “COEF” in the CALC menue
= air density (kg/m³)
pa = air pressure (Pa) value input at “P.abs” in the CALC menue
Ri = 
T = absolute temperature (K) value input in °C at “t” in the CALC menue
(0 °C = 231.15K)
Generally the pressure differences evaluated are very small, therefore it is recommended to use pressure
sensors with high resolution.
Recommended sensors for use with a Prandtl pitot tube:
Sensor Meas. range
Pmax Vmin Vmax
CALC-Menu

CALC-Menu

ConF-Menu
V
GMSD 2,5 MR - K51 2.500 mbar 1 m/s 4 km/h 20 m/s 72 km/h 000.0 1.0 1
GMSD 25 MR - K51 25.00 mbar 5 m/s 18 km/h 64 m/s 230 km/h 0000 5 1
It is not recommended to measure velocities below Vmin, because therefore the resolution of the sensors is
too low.
-:
If -1 digit is displayed at velocity of flow measurement the connected sensor gives a negative
pressure value -> check offset!
Velocity or flow calculation cannot be done with negative values.
7.7.2 Volumetric flow measurement in air: “CALC FLo”
The flow measurement is based on the velocity measurement (see above). Velocity multiplied with the cross-
section area (input in CALC menu by 

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8 Data Logger
The device supports two different logger functions:
“Func-Stor”: 
Additional input of measuring point (L-Id) is needed
“Func-CYCL”: Automatic recording at intervals of set cycle time
The logger stores 3 measuring values per data set:
-measuring or average (depends on function), min-peak and max-peak
- *): measuring or average (depends on function), Calculated value and dummy value
Min- and max-peak are the minimum and the maximum of the measured values since the last recording.
This allows precise analysis of the current pressure as well as pressure fluctuations.
For the evaluation of the data the software GSOFT3050 (version V3.0 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 more available, the key
 for the operation of the logger functions.
8.1 Manual Recording (“Func-Stor”)
a) Save measurements manually:

(p.r.t. :
Press “store” shortly: data set is sav
where XX is the number of the data set)
Input of measuring point - or .
Number 0 19999 or text assigned to number 1 40 (comfortable assignment of texts can be
done with gratis software GMHKonfig)
Confirm input with .
One data set contains:
-measuring value at the time of the recording
-CALC off *) min-peak, max-peak since the last recording
-CALC active *) Calculated value at the time of the recording and dummy value
-time and date of the recording
is displayed if logger storage is full.
*) CALC-Function: see chapter 7.6, 7.7

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b) Read manual recordings:
Saved data sets can be viewed both with PC-software GSOFT3050 and directly on the device display.
Do not change the pressure sensor if manual recording is selected and values are already
stored, because otherwise invalid data may be read-out. The pressure sensor used during the
recording has to be connected!
Press “menu” for 2 seconds: is displayed

configuration menu is displayed:
Press shortly: Change between measuring values, measuring point and
date+time of the data set
or Change between different data sets
End display of recordings
c) Clear manual recordings:

Press for 2 seconds
Select with or :
Clear nothing (cancel menu)
Clear all recordings
Clear the last recording

8.2 Automatic Recording with Selectable Cycle Time (“Func CYCL“)
the device will automatically record
measuring values at intervals of the set cycle time.
).
Storable data sets: 10000
A data set contains at slow measuring rate (rAtE SLo):
-measuring value at the time of the recording
-CALC off *): min-peak, max-peak since the last recording
-CALC active *): Calculated value at the time of the recording and dummy value
At data set contains at fast measuring rate (rAtE FASt and rAtE P.dEt):
-arithmetic average since the last recording
-CALC off *): min-peak, max-peak since the last recording
-CALC active *): Calculated value at the time of the recording and dummy value
*) CALC-Function: see chapter 7.6, 7.7

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At measuring kind "rAtE-Sloa power saving function is selectable: Lo.Po. If activated a
measurement is only done if it is also logged (i.e. no additional measurements between the saved
values). This seriously reduces the power consumption and is therefore especially appropriate for
long-term measurements (e.g. leak test) without an external power supply.
a) Start recording:
Press “store” for 2 seconds: Start Menu, press again: automatic recording will be started.

saved data set.
If the logger memory is full, the recording stops automatically and the display shows
If Low-Power-Logger-Function Lo.Po = on the device switches itself off as soon as the memory gets filled.
b) Stop recording:
Press “store” for 2 seconds: 
Select with or .
Do not stop recording
(cancel menu)
Stop recording

If you try to switch off the device while cyclic recording is active you will be asked whether the
recording should really be stopped.
The device can only be switched off if the recording is stopped.
Auto-off function is deactivated as long as cyclic recording is active.
c) Clear recordings:
Press “store” for 2 seconds: If there are data sets stored and recording is already stopped
is displayed
Select with or to call the clear-menu
Select with or .
Clear nothing (cancel menu)
Clear all recordings
Clear the last recording


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9 Universal Output
The output can be used either as serial interface (for USB 5100 interface converter) or as analog output
(0-1V). If the output is not needed, it is strongly recommended to deactivate it (Out oFF) to lower power
consumption. This increases battery life time.
If the device is used together with interface adapter USB 5100 the device is supplied from the interface.
Pin assignment:
4: external supply +5V, 50 mA
3: GND
2: TxD/RxD (3.3V Logic)
1: +UDAC, analog output

Only suitable adaptor cables are
permitted (accessories)!
9.1 Interface
The device can be connected to a USB interface of a PC by the electrically isolated interface converter
USB 5100 (accessory). The data is transmitted binary-coded and protected against transmission errors by
complex safety mechanism (CRC).
The following standard software packages are available:
GSOFT3050: Operating and evaluation software for the integrated logger function
EBS20M / -60M: 20-/60-channel software for measuring value display
EASYControl net: Universal multi-channel software for real-time recording and displaying of measuring
data; with real database
In case you want to develop your own software we offer a GMH3000-development package including:
a universally applicable Windows functions library ('GMH3x32e.DLL') with documentation, can be used


Programming examples 
The device has 3 channels:
-Channel 1: current measuring value (sensor 1) and base address
-Channel 2: min peak 
-Channel 3: max peak dummy value
The measuring-/ alarm- and display range values read back from the interface are always in
the selected measurement unit (mbar, bar...)!
*) CALC-Function: see chapter 7.6, 7.7

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9.2 Analog output
An analog voltage 0-1V can be tapped 
The analog output can be easily scaled with DAC.0 and DAC.1.
Please take care not to load the analog output too heavily, otherwise the output value will be distorted and
the power consumption will rise. Loads up to approx. 100 kOhm are unproblematic.
If the displayed value goes beyond DAC.1 the output voltage will be 1V.
If the displayed value falls below DAC.0 the output voltage will be 0V.
In error case (Err.1, Err.2, ----, etc.) the output voltage will be slightly higher than 1V.
The interface converter USB 5100 has a screw/plug connection; therefore no further cable is necessary if
USB 5100 is used.
10 Input Adjustment

sc
A reasonable adjustment presumes reliable references (e.g. ice water, controlled precision water bath, etc.).
If the inputs are adjusted (i.e. offset and scale are different from default settings) the device will shortly
r turned on.
Default setting 
Zero point correction:
Displayed value = measured value –OFFS
Zero point and slope correction:
Displayed value = (measured value –OFFS) * (1 + SCAL / 100 )
11 Pressure Connection to the Sensors
The device is designed to be connected to the sensors of the GMSD/GMXD...-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 ... 1000 bar absolute pressure can be connected to the device.
Relative pressure sensors (types: GMSD ... MR - K51, GMSD ... BR - K51)
For measurements of over- or under pressure:
Pressure sensors GMSD 2,5 MR - K51, GMSD 25 MR - K51 and GMSD 350 MR - K51 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 - K51: For tube connection B -19.99 to 25.00 mbar. If you
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 diameter Band A; make sure to
.
Absolute pressure sensors (types: GMSD ... BA - K51)
Connect plastic tube with an inner diameter of 4 mm A. (Port Bis not used.)
Stainless steel sensors (types: MSD ... MRE, MSD ... BRE, MSD ... BAE)
For measurements of over-, under- or absolute pressure screw sensor to G1/2" pressure terminal or plug
plastic tube to a suitable adapter. Connection to instrument: Use cable MSD-K51.

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12 Alarm (“AL.”)
There are 3 possible settings:
off (AL.oFF), on with buzzer (AL.on), on without buzzer (AL.no.So).
Alarm is given in the following cases (if alarm active, AL.on or AL.no.So):
-Lower alarm boundary (AL. Lo) under-run
-Upper alarm boundary (AL. Hi) over-rum
-Sensor error
-Low battery (bAt)
-Err.7: system error (always with buzzer!)
In case of an alarm (and when polling the interface) the prio-flag is set in the returned interface message.
13 Real Time Clock (“CLOC”)
The real time clock is used for chronological assignment of the logger data and calibration points. Please
check the settings when necessary.
14 Accuracy Check / Adjustment Service
You can send the device to the manufacturer for adjustment and inspection.
Calibration certificate - DKD certificate - official certifications:
If the measuring instrument is supposed to receive a calibration certificate, it has to be sent to the
manufacturer (declare test points).
If the device is certificated together with a suitable sensor very high overall accuracies are possible.
Basic settings can only be checked and if necessary corrected by the manufacturer.
A calibration protocol is enclosed to the device ex works. This documents the precision reached by the
production process.
15 Replacing Batteries
Before changing batteries, please read the following instruction and follow it step by step.
Not following the instruction may cause harm to the instrument or the
protection against ingress of water and dust may be lost!
Avoid unnecessary opening of the instrument!
1. Open the 3 Phillips screws at the backside of the instrument.
2. Lay down the still closed instrument, so that the display side
points upwards.
The lower half of the housing incl. the electronics should be kept
lying down during battery change.
This avoids loss of the sealing rings of the screw holes..
3. Lift upper half of housing. Keep an eye on the six function keys,
to be sure not to damage them.
4. Change carefully the two batteries (Type: AAA).
5. Close the housing, taking care that it is positioned correctly,
otherwise the sealing may be damaged. Afterwards press the
two halves together, lay the instrument with display pointing
downwards and screw it together again, beginning with the single
lower screw.
batteries 2* AAA
do not
touch
circuit

H82.0.02.6C-03 Operating Manual GMH 5150 page 18 of 20
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16 Error and System Messages
Display Description What to do?
or Err.9
No sensor connected Switch off device and connect sensor
Connected sensor or device defective If 2nd sensor available, check if device is ok. Return
defective device/sensor to manufacturer for repair
Value extremely out of measuring range Check: pressure not within sensor range?
No display or
confused
characters,
device does not
react on keypress
Battery empty Replace battery
Mains operation: wrong voltage or polarity Check power supply, replace it when necessary
System error Disconnect battery and power supplies, wait shortly,
then reconnect
Device defective Return to manufacturer for repair
Err.1 Measured value above allowable range Check: pressure not within sensor range?
-> measuring value to high!
Sensor defective Return to manufacturer for repair
Err.2 Measured value below allowable range Check: pressure not within sensor range?
-> measuring value to low!
Sensor defective Return to manufacturer for repair
Err.3 Display range overflow Check: value above 19999 -> to high to be displayed
Err.4 Display range underflow Check: value below -19999 (Tara?) -> to low
Er.11 Value could not be calculated Choose different unit
Calculation overflow happened Choose different unit
Err.7 System error Return to manufacturer for repair
––––Sensor not present / recognised reconnect sensor,
during logging: stop the logger and restart it
could not calculate value suitable sensor / unit combination necessary
If “bAt” is flashing, the battery will be exhausted soon. Further measurements are possible for short time. If


17 Reshipment und Disposal
17.1 Reshipment
_DANGER
All devices returned to the manufacturer have to be free of any residual of measuring media
and/or other hazardous substances. Measuring residuals at housing or sensor may be a risk for
persons or environment
Use a 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.
17.2 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.

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18 Specifications
Display range maximal -19999...19999 digit, depends on used sensor
Number of channels 1
Suitable probes GMSD - K51 and MSD sensors with connection cable MSD-K51
Available ranges/resolutions ranging from - mbar to 1000 bar / 1 bar
Connections sensor 7-pole bayonet socket
output /
ext. supply 4-pole socket for serial interface and supply (USB Adapter USB 5100) analog output 0-1V, adjustable
Display units depends on meas. range selection (depends on connected sensor):
mbar, bar, Pa, kPa, MPa, mmHg, inHg, PSI, mH2O
User unit freely adjustable
Measuring frequency 4 / s or 1000 / s
Accuracy ± 0.1 % FS ± 1 digit
Working conditions -25 ... 50 °C; 0 ... 95 %RH (non condensing)
Storage conditions -25 ... 70 °C
Display 4 ½ digit 7-segment display, illuminated (white)
Correction function offset / slope (via menu),
if offset/slope value not equal zero: "corr" is displayed
Leakage test function Pressure change rate display, configurable time base
Air velocity / volume flow measuring with pitot tube
Real-time clock integrated clock with date and year
Data logger cyclic 10000 data sets
manual 1000 data sets (with measuring point input,
40 adjustable measuring point text numbers)
Alarm channels 1 with individual alarm boundaries
types buzzer/visual/interface
Additional functions min- / max- / hold- function
Averaging adjustableseconds
Housing protection class IP65 and IP67
dimensions
L*W*H [mm] 160 * 86 * 37 incl. protective covering,
approx. 250 g incl. batteries and protective covering
Power supply 2*AAA-batteries (included in delivery)
current
consumption 2.0 mA (at Out = Off, equivalent to 500 h), illumination ~10mA (turns off automatically)
Battery-change indicator automatically if battery exhausted "bAt", warning "bAt" flashing
Auto-off-function 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 1and 120 min.; it can be
completely deactivated.
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%

H82.0.02.6C-03 Operating Manual GMH 5150 page 20 of 20
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