Service and maintenance
9.1 Instrument verification
SITRANS SL
Operating Instructions, 12/2010, A5E01132948-04
157
9.1.2
Verification with a verification cell
The verification cell is intended for the carbon monoxide version of the SITRANS SL
(SITRANS SL CO).
The verification module is mounted between the transmitter tube unit (transmitter) and
receiver tube unit (receiver) during verification. The verification kit consists of a metal tube
and a gas filled glass cell with a defined gas concentration stated in the corresponding
certificate.
9.1.2.1
Span verification
For the span verification of the instrument follow steps 1 through 3 below. This process
should be documented using the form "Verification Sheet" in Appendix A.
Necessary equipment
●
Verification kit
●
Sensor connecting cable
If your regular sensor connection cable cannot be removed from the installation, you
need a supplementary one.
Step 1: Setup of verification tube
1.
Start the procedure by removing the receiver and transmitter from the flanges. Depending
on the prevailing safety conditions and what is more convenient, the power may be kept
on and the sensor connection cable stay connected, or the power may be shut off and the
sensor connection cable be disconnected.
CAUTION
Never disconnect the sensor connection cable with the power switched on.
2.
Mount the receiver and transmitter on the verification tube.
3.
If the analyzer has been moved to a location with a different ambient temperature than
that at the installation site, you need to wait until it has been adapted to the new
temperature before proceeding from this step. In this way you avoid condensation
problems and assure static and homogeneous temperature distribution in the calibration
tube.
4.
If necessary, connect the sensor connection cable between the receiver and transmitter
and power up the SITRANS SL.