Teledyne 700 IR Series Instruction Manual page 27

3.4.2 AutoSpan
The AutoSpan function is used to span calibrate the sensor. Span adjustment is recommended at
50% of range for LEL and CO
concentration is not available, other concentrations may be used as long as they fall between 5%
and 95% of the detector's range. However, any alternate span gas concentration value must be
programmed via the "Set AutoSpan Level" menu before proceeding with AutoSpan calibration.
The gas Factor Table (See Table 2) should be used for Methane and for Heavy Hydrocarbon
gas.
Material Requirements:
• PN DET-327-000000-000 Programming Magnet
• PN DET-613-120000-700 OLCT 700/710 Series Splash Guard with integral Cal Port
and Calibration Wind Guard (PN 943-000000-000) -OR- PN DET-943-000006-132
Threaded Calibration Adapter
• PN 18108011 Span Gas; 2.5% vol. Methane (50% LEL) or other suitable span gas
containing a certified level of % LEL concentration of common combustible hydrocarbon
gas
• PN 18108014 Span Gas; 2.5% vol. CO
NOTE 1: If the span gas is different from the measured target gas, remember to use the
appropriate Gas Factor as described in Section 0.
NOTE 2: 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.
NOTE 3: The procedure described below is for combustible gases detectors. With regards to
CO gas detectors, the procedure is identical to the display differences.
2
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 0.
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=Zero . . . 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 700/710 will then scroll "Apply
XX %LEL Gas" (where XX is the AutoSpan Level).
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.
NP700IRIMEN
Revision E.0
INFRARED GAS DETECTOR FOR COMBUSTIBLE AND CO
detectors. If a span gas containing the recommended
2
for CO2 gas detectors
2
700 IR Series
2
GASES
USER MANUAL
21