KMS-2/Exia Transmitter
Installation and Operating Manual
ATEX
Page 2 of 13
KMS-2/Exia IOM
Rev C 14/06/2018
Introduction
A 4-20mA loop powered transmitter for measuring the level of liquid in a vessel either directly (immersion
application) with an annular float, or indirectly by mounting on a magnetic level gauge. The Exia
intrinsically safe version can be used in all hazardous area zones when connected through an approved
isolation barrier.
The transmitter consists of a stainless steel tube, containing the Magnetostrictive measuring element, and an
stainless housing containing the electronic circuit boards.
The unit operates by sending an electrical pulse down the sensing element; the resulting magnetic field
reacts with the field from the magnetic float to produce a return signal. The time taken for the return signal
to be detected enables a level measurement to be made since the precise velocity of the return signal along
the sensing element is known.
Outputs
LCD Indicator
: When fitted the display provides local indication dependent on the display mode as shown
in table 1
Mode Function
Display Mode*
¹
% Range
mA
PV (mm)
NORMAL Measuring
0.00/100.00 4.00-20.00 Actual distance in mm
from reference point
Fixed Output
Zero
0.00
4.00
Distance to Zero point
Span
100.00
20.00
Distance to Span point
CALIBRATION
Start
CAL 12.00
CAL
Zero set
CAL 12.00
CAL
Span set
CAL 12.00
CAL
Fault signalling
current setting
Downscale Set
AL.
LO
*
2
3.58*
2
AL.
LO
*
2
Upscale Set
AL.h
I
*
2
22.00*
2
AL.h
I
*
2
Alarm
Low Level *
3
ERR.L*
3
3.8*
3
ERR.L*
3
Downscale*
4
AL.LO 3.58
AL.LO
Upscale*
4
AL.HI 22.00
AL.HI
Table 1
LCD indication
*¹ The standard display mode is % range, alternate modes available on request
*² Analogue output remains at last measurement value during setting (Rev 5 Onwards)
*
3
When enabled by front panel switch, else will remain at 4mA until float no longer sensed.
*
4
Alarm action, set as required (Default upscale).
