9.9
Filter box measurement to check the measuring channels (for dry gases)
WARNING
Risk of explosion during filter box measurement in the Ex zone
The filter box is not designed for operation in the Ex zone.
b
Filter box measurement may only be carried out in an Ex-free environment.
b
Observe the relevant Operating Instructions when using the filter box.
Components required
Table 18: Components required for filter box measurement
Components required
Part number
Reflector enclosure with built-in gold-coated
hollow triple
2030206
Filter box with adapter plate for the GM700
Zero gas
Determining the necessary test gas concentration
1
General calculation:
Test gas conc. [ppm o. vol. %] =
Meas. range [ppm o. vol. %] x active meas. path [m]
0.15 m max. filter chamber length
2
Calculating setpoint values for all 6 chamber lengths:
×
Test gas conc. [ppm o. vol. %] =
NH
3 Desired
= test gas conc. [ppm] x 0,769 x
353
1013
273
Meas. range [ppm o. vol. %] x active meas. path [m]
act. air pressure [hpa]
L [mm]
Chamber
x 0,001
0.15 m max. filter chamber length
Table 19: Test gas concentration for NH
3
of the respective filter chamber length
Test gas concentration
Filter cham‐
ber lengths
25 mm
50 mm
75 mm
100 mm
125 mm
150 mm
NH
3
Installing the filter box
1
Provide the filter box with adapter plate and reflector enclosure.
2
Remove the intermediate enclosure from the sender/receiver unit:
w
Swivel the intermediate enclosure of the device open.
w
Remove pin.
w
Remove the intermediate enclosure.
w
Store the intermediate enclosure dry and clean during the filter box measure‐
ment.
3
Fit the filter box in the device:
w
Insert the filter box in the SR-unit hinge.
w
Insert and fasten the hinge.
w
Swivel the filter box on the SR-unit in and lock with the locking device
4
Attach the reflector for the device on the filter box:
w
Fasten the reflector enclosure to the filter box with 4 screws.
MAINTENANCE
9
8019532/100Q/V1-1/2018-08 | SICK
O P E R A T I N G I N S T R U C T I O N S | GM700 Ex
75
Subject to change without notice