WIKA T91.30 Betriebsanleitung

Analogue temperature transmitter
Model T91.30
1. Intended use
The model T91.30 temperature transmitter is a fixed-range transmitter,
configurable via a PC, for use with resistance thermometers and
potentiometers.
The instrument has been designed and built solely for the intended use
described here, and may only be used accordingly.
The technical specifications contained in these operating instructions must
be observed. Improper handling or operation of the instrument outside of its
technical specifications requires the instrument to be taken out of service
immediately and inspected by an authorised WIKA service engineer.
2. Safety instructions
When installing, commissioning and operating these transmitters,
observe the current, valid national safety instructions (e.g.
IEC 60364).
Non-observance of the respective regulations can cause serious physical
injuries and/or damage to property. Only appropriately qualified personnel
is allowed to work on this instrument. Before commissioning, check the
suitability for the respective application.
Pay particular attention to the permissible ambient and operating conditions
specified in chapter 9 "Specifications".
3. Mounting
Model T91.30 transmitters are intended for mounting on a standard rail.
Mounting is achieved, without tools, by snapping it onto a 35 mm DIN rail
(DIN EN 50022-35). Dismounting is made by unclipping the latching element.
4. Maintenance
The temperature transmitters described here are maintenance-free! The
electronics incorporate no components which could be repaired or replaced.
Depending on the operating conditions, we recommend an annual calibration
of the transmitters.
5. Electrical connections
The transmitters described here have an internal galvanic connection
between the sensor input and the analogue output.
To avoid ground loops, there must be no galvanic connection between
the sensor and the supply or output voltage. Ungrounded thermocouples
should therefore be used in preference! (Exception model T91.30.232:
This transmitter has a galvanic isolation between input and output. For
further information on this model, see chapter 5.2). For stranded wires, we
recommend the use of crimped end splices. When connecting thermocouples,
make sure that the thermocouple is connected with the correct polarity. If the
lead between the thermocouple and the transmitter needs to be extended,
only use thermal or compensation cable appropriate for the connected
thermocouple type.
Operating Instructions
5.1 Sensor input Pt100
Model T91.30.214
Pt100 in 2- or 3-wire connection. With the 2-wire connection, the resistance
of the cable is added as an error in the measuring result. Therefore, this
connection should only be selected for short cable lengths or low accuracy
requirements. With the 2-wire connection, a bridge must be placed between
connections 1 and 2 or 3 and 4. With the 3-wire connection, the resistance
of the corresponding partial cable is not included in the measuring result due
to the separation of a supply line into current and signal path. With the 3-wire
connection, a bridge must be placed between connections 1 and 2.
AC 230 V
DC 24 V
8 7
Zero
1 2 3 4
Pt100
Model T91.30.224
Pt100 in 2- or 3-wire connection. With the 2-wire connection, the resistance
of the cable is added as an error in the measuring result. Therefore, this
connection should only be selected for short cable lengths or low accuracy
requirements. With the 2-wire connection, a bridge must be placed between
connections 3 and 4.
AC 230 V
DC 24 V
8 7
Zero
1 2 3 4
Pt100
Model T91.30.254
Pt100 in 2- or 3-wire connection. With the 2-wire connection, the resistance
of the cable is added as an error in the measuring result. Therefore, this
connection should only be selected for short cable lengths or low accuracy
requirements. With the 2-wire connection, a bridge must be placed between
connections 3 and 4.
AC 230 V
DC 24 V
8 7
Span
1
Pt100
5.2 Sensor input thermocouple
Model T91.30.232
The positive leg of the thermocouple is connected to terminal 3 and the
negative leg to terminal 2 of the transmitter. The output voltage follows the
voltage at the input linearly. There must be no galvanic connection between
the sensor and the supply or output voltage.
Load
(PLC, PC)
6
Span
Load
(PLC, PC)
6
Span
Load
(PLC, PC)
6
Zero
3 4