- 39 -
(
７
) Sampling unit replacement
Replace the sampling unit with a new one every 3 years. For procedure, refer to 9-3
. “Sampling
Unit Replacement”.
(8) Loop check and alarm test using TEST switch
Press the TEST switch with the test stick to send a pre-set analog output to the host system.
Check the output at the host system. Press the TEST switch to return the output to normal.
Refer to 7-4.
“Operation - Test Mode”.
Example of the check/inspection results
No.
Model
Target gas
Full scale value
1
PS-7
CO
250 ppm
2
PS-7
SiH4
25 ppm
3
4
5
No.
Location
Base value
Alarm set
value
Flow
rate
Alarm
test
using
TEST
switch
Airtightness
Filter
element
Tubing
Replaceme
nt sensor
No.
Replace
sampling
unit
Before
adj.
After
adj.
1
st
stage
2
nd
stag
e
1
Cabinet
0
0
50
100
■
■
■
■
■
H1021943
―――
2
Device A
0
0
5
10
■
■
■
■
■
H1021944
―――
3
□
□
□
□
□
4
□
□
□
□
□
5
□
□
□
□
□
To maintain the reliability of the gas detector, perform a gas alarm test by using TEST
switch, etc. at least once a month.
While in test mode (alarm test using TEST switch), the gas alarm contacts activate. If
the gas alarm contacts are used to operate the interlocks of the external devices,
release the interlocks beforehand, as needed to prevent a possible activation of the
interlocks during the test mode, or
enter the maintenance mode before entering the test mode, then release the interlocks
of the external devices beforehand as needed. (Refer to 7-5.
“Operation - Maintenance
Mode” for more information).
Notify those concerned before starting the gas alarm test.
