Replacing The Measuring Cell - Systech Instruments EC900 series Operator's Instruction Manual

17.0 REPLACING THE MEASURING CELL

If you are in any doubt as to how to proceed, please contact Systech / Illinois for information.
1) Switch off the analyzer at the rear panel switch and remove the mains connector.
2) Fully close the sample IN valve on the rear panel, and then fully close the sample OUT valve.
(N.B. This sequence is required in order to avoid pressurising the cell.
recommissioning; fully open the IN valve before opening the OUT valve).
3) Remove the 'd' type electrical connection from the cell body.
4) Using a 7/16" spanner slacken the Swagelok fittings connecting the cell's sample lines to the
flow control valves.
5) Remove the two Posidrive screws from the top and bottom of the cell.
6) Slide the cell assembly to the left (seen from the rear of the instrument) to disconnect the
sample lines, and withdraw the cell from the instrument.
7) Position the replacement cell in the instrument and loosely locate the two mounting screws.
Do not tighten the mounting screws.
8) Slide the cell to the right ensuring the sample lines locate with the Swagelok fittings. Tighten
the Swagelok fittings to finger tight and then tighten slightly with a spanner.
9) Fully tighten the two mounting screws.
10) Reconnect the 'd' type electrical connection to the cell body.
11) Fully open the IN valve, then open the OUT valve to set the required flow rate.
12) Reconnect the power supply.
TM
NOTE: all 900 RACE
for % measurements and the other for ppm. The cell visible from the rear of the EC 910 and EC930 is
the % Cell. The ppm cell is fitted inside the unit.
N.B. Following a cell change it is recommended that the instrument be allowed to warm up, and the
sample lines purged before a calibration is performed
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EC900 Series Operation Manual
series instruments are configured with two individual sensor cells. One cell is
V4.7
When
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