17
3
3
.
.
T
T
E
E
S
S
T
T
I
I
N
N
G
G
o
o
f
f
r
r
e
e
l
l
a
a
y
y
s
s
a
a
n
n
d
d
e
e
x
x
t
t
e
e
r
r
n
n
a
a
l
l
c
c
o
o
n
n
t
t
r
r
o
o
l
l
s
s
It is also recommended to periodically check alarm activation and the corresponding external
controls.
4
4
.
.
C
C
l
l
e
e
a
a
n
n
i
i
n
n
g
g
Do not use alcohol or ammonia-based liquids to clean the central unit.
If needed, clean the outside of the case with a damp cloth.
5
5
.
.
C
C
e
e
n
n
t
t
r
r
a
a
l
l
u
u
n
n
i
i
t
t
m
m
a
a
i
i
n
n
t
t
e
e
n
n
a
a
n
n
c
c
e
e
The central unit does not require special maintenance.
If sensor calibration is required, this operation should only be performed by qualified personnel.
Gas detection instruments are potential life-saving devices. Recognizing this fact, Industrial
Scientific Corporation recommends that a functional “bump” test be performed on every fixed gas-
monitoring instruments as part of a regular maintenance program. A functional test is defined as a
brief exposure of the detector to a concentration of gas(es) in excess of the lowest alarm set-point
for each sensor for the purpose of verifying sensor and alarm operation and is not intended to be a
measure of the accuracy of the instrument.
Industrial scientific further recommends that a full instrument calibration be performed using a
certified concentration(s) of calibration gas(es) quarterly, every 3 months.* Calibrations may be
necessary more or less frequently based, for example, on application, field conditions, exposure to
gas, sensor technology, and environmental conditions. The frequency of calibration is best
determined by company policy or local regulatory agencies.
If an instrument fails to operate properly during any functional “bump” test, a full instrument
calibration should be performed successfully prior to use.
These recommendations are based on safe work procedures, industry best practises, and regulatory
standards to ensure worker safety. Industrial scientific is not responsible for setting safety practices
and policies.
* For new installations it may be prudent to carry out bump tests frequently at first (perhaps
weekly), increasing the time intervals (to, perhaps, monthly or more) as confidence grows with
experience in the installation concerned, on the basis of the maintenance record.
•
REFER TO CHAPTERS 4.2.5 AND 4.2.8 (INITIALISATION AND TEST)
•
Do not forget to initialise the system upon cell replacement: use the “INI” menu
(chapter 4.2.5).
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