Pressure gauges with output signal, optionally for hazardous areas20
11297264.05 07/2019 EN/DE
EN
Electrical zero point
If the mechanical zero point has been altered via the adjustable pointer, the electrical zero
point must be matched to the mechanical one. To do this, apply the pressure value of the
scale start. The scale start corresponds to the smallest electrical signal (depending on the
variant either 0 mA, 4 mA or 0 V).
With a small piece of stranded wire (maximum permissible resistance 30 Ω), stripped at both
ends, bridge terminals 5 and 6 on the socket insert.
Installation cable socket
Connect the socket insert to the cable cover and assemble the cable cover cap with the
sealing and screw (see cable socket drawing).
Insert the assembly, which has just been assembled, onto the cable socket baseplate
with sealing.
Screw the screws on the cable cover cap in fully with a slotted screwdriver (0.6 x 3.5 mm).
In order that the ingress protection is maintained, the seals must be retted.
Store zero point in transmitter electronics
After switching on the supply voltage, within a max. 30 seconds, the new zero point will
be saved in the transmitter electronics. As a check, during this time, a current increase to
9.5 mA can be measured in the current loop on a display unit (e.g. ammeter).
Removing the terminal bridge
Switch o supply voltage and display unit.
Carry out the “Dismounting cable socket” described above.
Remove the stranded wire for bridging terminals 5 and 6 from the socket insert.
Carry out the “Installation cable socket” described above.
The electrical output signal will once more match the display of the mechanical pointer.
Close all valves opened for the zero point setting again.
5.4 Commissioning
Pressure surges must be avoided at all costs, open the shut-o valves slowly.
5. Commissioning, operation
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