H31.0.11.6C-11
User’s Manual GMH3110
page 4
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2 Configuration
To change device settings, press
Menu
(key 4) for 2 seconds. This will call the configuration menu.
Pressing 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.
2.1 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] =H
2
O is just supported by devices with [m] printed below the display!
2.2 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 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‘s 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).
2.3 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“.
2.4 Adr: Base Address of Interface
Up to 10 devices of the GMH3xxx- handheld-family can be connected to a serial interface at
once (depending on 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.
3 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 sensor is at ambient air and then bring sensor to
the depth to be measured. The display shows now the depth in [m].
•
With 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 press. connection for higher pressure to water
depth to be measured (display and is compensated for pressure changes in ambient air).
4 Calibration Services
Calibration certificates – DKD-certificates – other certificates:
If 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 to do efficient recalibration if necessary to get results of highest accuracy!
MPa
Pa
bar
mbar
kPa
Tara
AL Logg
SL
PSI
mbar
MPa
Pa
bar
mbar
kPa
Tara
AL Logg
SL
PSI
MPa
Pa
bar
mbar
kPa
Tara
AL Logg
SL
PSI
MPa
Pa
bar
mbar
kPa
Tara
AL Logg
SL
PSI
MPa
Pa
bar
mbar
kPa
Tara
AL Logg
SL
PSI
mbar
