OLCT 700/710 TP
OLCT 700/710 TP Instruction Manual
Rev. C.1
Page 29 of 45
5.
Service and Maintenance
5.1
Calibration Frequency
Gas detectors are safety devices. OLDHAM recommends the regular testing of fixed gas detection
installations. This type of test consists of applying calibration gas at a sufficient concentration to trigger the
pre-set alarms. It is to be understood that this test is in no way a replacement for a detector calibration. The
bump tests frequency depends on the application. Upon initial installation and commissioning, close
frequency tests should be performed, weekly to monthly. Test results should be recorded and reviewed to
determine a suitable calibration interval; however, it must not exceed one year. The general manager
should put safety procedures in place on-site. OLDHAM cannot be held responsible for their enforcement.
5.2
Visual Inspection
The Detector should be inspected annually. Inspect for signs of corrosion, pitting, and water damage.
During visual inspection, the Splash Guard should be inspected to insure that it is not blocked. Examine
the porous 316SS flame arrestor within the detector’s bottom housing for signs of physical blockage or
severe corrosion. Also, inspect inside the Junction Box for signs of water accumulation or Terminal Block
corrosion.
5.3
Condensation Prevention Packet
A moisture condensation packet should be installed in every explosion proof Junction Box. The moisture
condensation prevention packet will prevent the internal volume of the J-Box from condensing and
accumulating moisture due to day-night humidity changes. This packet should be replaced annually.
Oldham’s PN is DET-960-202200-000.
NOTE:
A desiccant cap with a desiccant packet is attached to the sensor housing to avoid
damage during storage and shipping. This prevents water from contacting the sensor film, and
as a result helps to retain the stability of the factory span calibration.
NOTE
: Store the desiccant caps with the desiccant packets in a sealed container (i.e. zip-lock
bag) for future use. It is advisable to reinstall the desiccant cap and packet during prolonged
periods without power (more than 1 day is considered “prolonged”). An active desiccant packet
is blue in color and turns pink when consumed (PN DET-960-399800-000 Package of 10).
5.4
Replacement of Plug-in H
2
S Sensor
O-Rings
Splash Guard
Adapter
Plug-in Replaceable
H2S Sensor
Lens and LED
Display
Interconnect
Wires
Housing Bottom
Locking Set-Screw
Intelligent Transmitter Module (ITM)
Micro-processor controlled circuit
encapsulated in an Explosion proof
housing.
Magnetic
Programming
Switches
M
OD
E
L
TP-7
00
de
tco
n
in
c.
H
2
S Sen
so
r
SplashGuard
Figure 12:
Detector Assembly
O
L
D
H
A
M
O
L
CT
700
TP
Summary of Contents for 700 TP Series
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