Lamtec LT 2 - Setting the Reference Air Quantity

6 Commissioning / Shutdown
59
6.3 Setting the reference air quantity
NOTE:
Only compressed air that is free from oil and water may be used as reference air. We
recommend using instrument air, where this is available.
If neither compressed air nor instrument air is available, an optional pump unit can be
employed in the external housing Type 657 R 1061. This pump unit cannot be
retrofitted in the LT 2 housing
NOTE:
The reference air is monitored continuously by a differential pressure sensor, which is
installed in the probe connection box of the KS1-DK.
The reference air is monitored with the fault “No reference air”.
Initiation time: 1 hour
1.) Calibrate the differential pressure sensor to 0.
To do so, close the reference air throttle completely and set parameter 108
in the LT 2/KS1-DK to “initiate”.
2.) Next, open the reference air throttle until a differential pressure of 2 to 3 mbar
is reached (see display in the LT2 “P ref.air”).
2.) Check calibration after a few hours of operation, maybe repeat it.
LT2 display
PCB interior view of
KS1-DK probe
Hose connection for reference air
(instrument air pre-pressure 1bar)
Hose connection for test gas (instrument air
or calibrating gas pre-pressure 1bar)
Differential pressure sensor
Absolute pressure
sensor
Throttle
Test gas
Throttle
Reference
air
Electr.
connections
Pressure sensors
Electr.
connections
Probe
Air
outlet
Shut-off plug
valve
Test gas