OLCT 700/710 TP
Page 18 of 45
Rev. C.1
OLCT 700/710 TP Instruction Manual
10ppm for 0-20ppm range).
Material Requirements:
•
PN DET-327-000000-000 MicroSafe™ Programming Magnet
•
PN DET-613-120000-700 OLCT 700/710 Splash Guard with integral Cal Port and Calibration
Wind Guard (PN DET-943-000000-000) -OR- PN DET-943-000006-132 Threaded Calibration
Adapter
•
PN DET-985-241100-321 In-Line Humidifying Tube
•
PN 18108087 H
2
S Span Gas in air balance
NOTE 1:
The span gas source must have a normal background concentration of 20.9% O2
(H
2
S balanced with Air). Pure Nitrogen background mixtures are not acceptable! Significant
span calibration inaccuracies will result.
NOTE 2:
An H
2
S gas concentration of 25ppm is strongly recommended for 0-50 and 0-
100ppm ranges (10ppm span gas for 0-20ppm range). This should be supplied at a controlled
flow rate of 200 to 500cc/min.
NOTE 3
: Span gas bottles contain 0% humidity and this ultra-low humidity condition will
cause inaccurate readings when used to calibrate a detector. To prevent this error, Oldham
prescribes the use of a 24” flexible In-Line Humidifying Tube.
NOTE 4:
The Calibration Wind Guard must be used when the Splashguard Adapter with
integral Cal Port is used. Failure to use the Calibration Wind Guard may result in an inaccurate
AutoSpan calibration.
AutoSpan consists of entering Calibration Mode and following the menu-displayed instructions. Follow
the instructions “a” through “e” below for AutoSpan calibration.
a)
Verify that the AutoSpan Level is equal to the Calibration Span Gas Concentration (refer to View
Sensor Status in Section 3.5.2.). If the AutoSpan Level is not equal to the Calibration span gas
concentration, adjust the AutoSpan Level as instructed in Section 3.5.3 Set AutoSpan Level.
b)
From Normal Operation, enter Calibration Mode by holding the programming magnet over PGM1 for
3 seconds. Note, the “◄” prompt will show that the magnetic switch is activated during the 3 second
hold period. The display will then scroll “PGM1=Exit PGM2=Span”. Hold the programming magnet
over PGM2 for 3 seconds to execute AutoSpan (or allow to timeout in 5 seconds if AutoSpan is not
intended). The OLCT 700/710will then scroll “Apply XX ppm Gas”.
NOTE:
Upon entering Calibration Mode, the 4-20mA signal drops to 2mA and is held at this
level until the program returns to normal operation. Modbus™ Status Register bit 14 is also set
to signify when the detector is in-calibration mode.
c)
Apply the span calibration test gas via the In-Line Humidifying Tube at a flow rate of 0.2-0.5l/min. As
the detector signal begins to increase the display will switch to reporting “XX“ reading methods as the
detector shows the sensor’s “as found” response to the span gas presented. If it fails to meet the
minimum in-range signal change criteria within 2½ minutes, the display will report “Range Fault”
twice and the OLCT 700/710 will return to normal operation, aborting the AutoSpan sequence. The
detector will continue to report a “Range Fault” and will not clear the fault until a successful AutoSpan
is completed.
Summary of Contents for 700 TP Series
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