WIKA Cryo Gauge 712.15.100 Betriebsanleitung Seite 22

4. Commissioning, operation
With multiple scales or replaceable plug-in scales (option), the output signal of 4 ... 20 mA
corresponding to each scale can be stored in a microprocessor.
The output signal can be changed over
to the desired fluid type by rotating the
optional BCD switch (accessible through
a sealing cap on the left side of the case)
EN
using a screwdriver.
Electrical zero point with BCD switch
option
If a zero point adjustment is required (e.g.
after mechanical zero point setting), the
instrument must first be de-energised
(pull the plug). Afterwards re-establish the
voltage supply (insert the plug) and press
the zero point button for approx. 1 second within 30 seconds.
Electrical zero point without BCD switch option
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.
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.
Mounting 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 refitted.
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).
Differential pressure gauge models 712.15.100, 732.15.100, optional for hazardous areas
22
BCD switch (scale selection switch) and zero
point key (sealing cap removed)