H18.0.0x.6C-01
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What to observe during operation:
a) When to replace battery:
Make sure to apply correct operating voltage as wrong voltage will lead to measuring inaccuracies. As soon as "BAT" is
displayed, battery is used up and needs to be replaced.
If the indication is ignored (e.g. device switched on inadvertently for an extended period of time) and battery is very low, the
battery voltage may be too low to trigger BAT display. The values in the display may, however, seem to be correct (although
they no longer correspond to the analog output voltage) !
In case of measuring faults make it a rule to first of all check battery
and replace battery if necessary!
b) The battery has to be taken out, when storing device above 50°C.
It is recommended to take the battery out, when storing device for a longer period of time.
c) Both measuring device and sensor have to be treated carefully and should only be used in accordance with the
specifications (do not throw, bump device etc.). Plug and socket have to be protected from soiling.
d) The pressure sensor may be disconnected - do not tear at cable when doing so!
When connecting the sensor the arrow on the plug has to point upwards; make sure to enter the plug centrally into the
socket. Plug has to be level when being entered into socket, do not tilt ! In the correct position the plug will easily slide into
the socket.
An inaccurate or tilted position when trying to connect the sensor may lead to the connector pins being spoiled by bending or
being broken. => Plug can no longer be used and will have to be replaced.
Please note:
When exchanging the sensor, the device will have to be re-calibrated for the new sensor!
e) Connection of pressure tubes for
relative pressure sensors
(GDH01AN, GDH07AN, GDH13AN, GDH14AN)
:
For over/under pressure measurement:
•
Connect plastic tube with internal diameter of 4 mm to connecting terminal "B"; connection "A" will not be used!
For measurements of pressure differences:
•
Connect both plastic tubes with internal diameters of 4 mm to connecting terminals "A" and "B"; terminal "B" to be used for
the higher pressure.
As the sensor connection terminals are made of plastic, they may break when being handled inexpertly (e.g. bending etc.).
To disconnect sensor you should simultaneously tear and turn at the plastic tube.
If tube has to be changed frequently, it is good practice to connect a short tube permanently at the sensor and to use an
adapter (accessories) at the open end.
f) Connection of pressure tubes for
absolute pressure sensors
(GDHH12AN)
:
For absolute pressure measurement:
•
Connect plastic tube with internal diameter of 4 mm to connecting terminal "A";
connection "B" will not be used!
As the sensor connection terminal is made of plastic, they may break when being handled inexpertly (e.g. bending etc.). To
disconnect sensor you should simultaneously tear and turn at the plastic tube.
If tube has to be changed frequently, it is good practice to connect a short tube permanently at the sensor and to use an
adapter (accessories) at the open end.
g) General information for GDH07AN, GDH13AN and GDH14AN:
The sensor being a relative pressure sensor, the standard device display is 0. If necessary adjust zero potentiometer
(identification: "Nullp. = zero point" - Make sure never to change the "scale" potentiometer settings).
h) General information for GDH01AN:
Because of the extreme pressure resolution the sensor is position dependend. It is calibrated in a certain position. Being in
that position, the device shows "000". During precision measurings turn the sensor to the position, where 000 is displayed.
If this is not possible, You may adjust the devices offset value by using a suitable screwdriver at the offset potentiometer
marked with "Nullp.".
i) The device and the sensor will be calibrated before leaving our works.
If the permissible pressure has been exceeded (overload), recalibration of the device and sensor may be required.
In case you are not in a position to carry out recalibration yourself, please return
both
sensor
and
device to our works.
