Change Of Sensor Element - Extron electronics ExSens Instruction Manual

2 to 20.4 mA Measuring Mode
(22 mA) (3.2.1)
> 22 mA Short Circuit of
Cable
(3.2.6)

Change of Sensor Element

3.4
The maintenance friendly concept of the Transmitter Series ExSens(-I) and Sens(-
I) renders possible to change the sensor element easily. You simply have to inform
us on the serial number of the transmitter and we will send you a replacement sen-
sor element. Exception: Sensor elements of IR-versions -IR shall be replaced at
ExTox only.
Please keep in mind the details in Chapter 0 when working in hazardous areas.
To change the sensor element you have to separate the transmitter from power
supply (U+) and ground (GND) ( DB, Clamp Connection). This could also be done
at the control unit or – if danger of explosion can safely be excluded – at the
transmitter itself. Please keep the connection to ground.
After opening the cover remove the flat cable plug which connects the sensor ele-
ment with the transmitter electronics in the housing.
You have to loosen the two grub screws which serve as protection against twisting
first – for working on the ExSens(-I). Then you have to turn off the sensor element
from the housing. To loosen the bolted connection use an open-ended wrench size
41 mm. Be careful not to destroy the flat cable. Assembly of the sensor element is
done the other way round. The sensor element has to be screwed in completely and
has to be fixed with the open-ended wrench. Do not forget to screw in the two grub
screws as protection against twisting again.
For working on the Sens(-I) you have to loosen the three bolted connections, which
connect the sensor cap, the housing and the sensor element. Exchange the sensor
element and assemble the transmitter again. Please pay attention to the correct re-
placing of maybe existing seals.
Close the housing and connect the power supply.
On the types ExSens-I and Sens-I you have to close the jumper contact JP3 on the
electronic PCB for a short time and then open it again. By doing this the settings for
zero point, sensitivity and drift are reset to the value at factory setting.
You could return the exchanged sensor element to ExTox for disposal.
The sensor element is factory-made pre-adjusted. After passing the stabilisation
time calibration has to be done anyway according to Chapter 6.5.1.
Page 10 of 20
ExTox Transmitter ExSens(-I) and Sens(-I)
on off -
on off
Instruction Manual
Check electrical connection
Repair cable