INFICON Sensistor ISH2000 Hydrogen Leak Detector - Manual (Page 82)

Sensistor ISH2000 Technical Reference Manual (TRM) EN- 82
E 130
Figure E-2: Connect a hose to the gas regulator
d. Purge the hose with low flow of reference gas (1-5 cc/s). If you put the
hose in a glass of water it should NOT "boil" the water but only release a
gentle stream of bubbles.
2. Preparing the Hydrogen Sensor
a. Switch power OFF on Sensistor ISH2000
b. Connect the probe and probe cable according to Manual
c. Start Sensistor ISH2000 in service mode by doing the following:
i. Press and hold the right button while switching power ON.
ii. Release button when text screen appears. (If logo appears you
released the button too late - try again)
iii. Go to service mode display after warm up period.
d. Remove probe tip protection cap!
e. Wait minimum 10 minutes more to stabilize sensor.
3. Sensitivity Test with Reference Gas 10 ppm
a. Make absolutely sure there is no abnormal increase of Hydrogen in the
background ( i.e. avoid: smoking in the room, releasing tracer gas in big
clouds, flatulence etc). Make sure you have as normal background of H2 as
possible (0.5 ppm).
b. Check that the Signal is 0.00E+00 (see See Figure E-3:"Service mode
screen")
Figure E-3: Service mode screen
c. Open a gas flow of about 1-5 cc/s.
d. Wait until you are sure there is only the 10 ppm gas in the hose.
e. Insert the probe tip (without protection cap) minimum 1 cm into the
open end of the hose. See See Figure E-2:"Connect a hose to the gas reg-
ulator". There must be no pressure on the sensor.
f. Wait until the signal has stabilized (takes a few seconds).
g. Read the Signal and then remove the probe. Close gas flow. The Signal
is given in scientific (engineering) format.
Examples:
• 7.50E-01 = 7.5 x 10-1 = 0.75
• 1.40E+0.0 = 1.4 x 100 = 1.4
Probe tip
11-15 mm
Gas flow