KMS-2/Exia/Exd Transmitter
Installation and Operating Manual
Page 8 of 16 KMS-2:Exia/Exd IOM
Rev H 18/05/10
ATEX
9. Press the ‘Span’ button until the ‘Span’ LED stays on
10. Wait until the ‘Span’ LED extinguishes. (output 20mA)
If the optional LCD is fitted the display will read ‘CAL’ during the setting process.
The measuring range can be set within the factory limits with a maximum turndown of 50%,
If an error is detected during the ranging process the unit will default to the previously
saved values the Relevant LED will flash if ranging failed.
Inverse output
The output is normally set so that the 20mA point is at the Head shell end. If it is required to mount the
head shell at the bottom the output can be inverted by following procedure.
1. Move the float to approximately 50% of range
2. Set the ‘Zero’ level as 2-5 above
3. Move the float to the required maximum level
4. Set the ‘Span level as 7-9 above,
5. Move the float to the required minimum level zero level.
6. Set the ‘Zero level as 2-5 above.
The unit will then automatically invert the output.
Caution
The float failure and write protect switches should be set to the ‘OFF’ position before
adjustment to the ranging are made, and reinstated as necessary afterwards.
It is important that the float is kept stationary for approximately 10 seconds before and
after operation of the calibration buttons to ensure that the output signal has stabilised
to the correct value.
Low level alarm
The Low Level alarm output signal will change the output to 3.8mA if the float drops more than 13mm
below Zero point. When off the output will remain at 4mA below the zero point until the return signal is
lost i.e. the sensor is no longer sensing the magnetic field then output will change to 22mA.
1) Write Protect
Up
Range setting inhibited
Down
2) Alarm Function
Up
Low Level
(3.8mA)
Down
No Alarm Output
Remains at 4mA
Fig. 6
Configuration switches
Caution
Turn power off before changing alarm switch settings to prevent unexpected changes in
loop current. Ensure that the write protect is set to ‘ON’ after changes to range
adjustments.
FIXED OUTPUT
To allow for loop calibration the transducer output can be fixed to either 4 or 20mA. The zero or span
button should be depressed until the respective LED lights; the output will then remain static. To reset to
