Atmospheric Pressure; Trouble-Shooting - Ahlborn ALMEMO 2470-1S Operating Instruction

13.5 Atmospheric pressure

To perform pressure compensation on various
sensors (see 10.2.2, with PC) the current atmo-
spheric pressure is required. (see 10.7)
The atmospheric pressure can be pro-
grammed explicitly in menu item ´P mb´. (see
9.3)
If atmospheric pressure at a measuring point
is used for compensation purposes a symbol
´P´ is displayed after the measuring point in question; if atmospheric pressure
is itself being measured the symbol ´P´ is displayed with a dot flashing in front
of it.
The default setting on special device 2470-1SRH is to measure atmospheric
pressure and use this for compensation.

14. TROUBLE-SHOOTING

The ALMEMO ® 2470 measuring instrument can be configured and programmed
in many different ways. It is suitable for connecting a wide variety of different
sensors, other measuring instruments, alarm signaling devices, and peripheral
equipment. Given these numerous possibilities the device may in certain circum-
stances not behave quite as expected. The cause of such unexpected behavior
is only very rarely a device defect; usually the cause is incorrect operation by the
user, an invalid setting, or unsuitable cabling. In such event please try to pin-
point and clear the problem with the aid of the following tests.
Error No display, display malfunction, keys do not react.
Remedy Check the power supply; use fresh batteries; switch OFF and then
ON again; if necessary re-initialize. (see 7.6)
Error Measured values are incorrect.
Remedy Switch the device OFF and, pressing and holding down key
switch ON again;
via interface check all the channel programming very carefully, espe-
cially the base value and zero-point.
Error Measured values fluctuate or there is no reaction to changes in
measured value or to new inputs.
Remedy Check the cabling for any inadmissible electrical connections. Unplug
any suspicious sensors. Connect a hand-held sensor in air or a
phantom sensor (for thermocouples short-circuit A-B, for Pt100
sensors use 100 Ω) and check. Connect the sensors again one at a
time and check successively. If a fault persists for any one connec-
tion, check all wiring; if necessary, insulate the sensor and eliminate
interference by using shielded or twisted wiring.
Error ´CALEr´ is displayed when the device is switched on.
Atmospheric pressure
ALMEMO ® 2470
,
CLR
39