WIKA IS-3 User Manual

44 WIKA operating instructions pressure transmitter, model IS-3
MM/YYYY country code based on 14095850.02 12/2014 EN/CN
EN
6.4 Function of the test circuit for 2-wire
This function is only possible for instrument designs with a eld case.
Using the test circuit, it is possible to carry out a current measurement during normal operation without disconnecting
the pressure transmitter. For this purpose, connect an ammeter suitable for your Ex applications (internal resistance
< 15 Ω) to the test
+
and test
-
terminals.
Functional check
The output signal must be proportional to the prevailing pressure. If this is not the case, this may indicate a damaged
diaphragm of the process connection. In this case, see chapter 9 “Faults”.
7. Adjusting the zero point and span
The span-setting potentiometer is used for factory adjustment and should only be readjusted if calibra-
tion equipment is available which has at least three times the accuracy of the pressure transmitter.
7.1 Access to potentiometer
To gain access to the potentiometers, open the instrument as follows:
Clampingnut(gureA)
1. Disconnect the electrical connection (1) from the instrument.
2. Remove the clamping nut (2).
3. Carefully pull the instrument connector (3) from the instrument.
Screw,eldcase(gureA)
Unscrew the screw on the top of the case or the case cover.
6. Commissioning, operation / 7. Adjusting the zero point and span

WIKA IS-3 Specifications

General

Output Signal	4 ... 20 mA, 2-wire
Power Supply	10 ... 30 VDC
Material	Stainless steel
Accuracy	≤ ±0.5 % of span
Temperature Range	-20 ... +85 °C
Ingress Protection	IP65
Long-term stability	±0.2 % FS per year
Process Connection	G 1/4, G 1/2, 1/4" NPT, 1/2" NPT
Electrical Connection	M12 x 1