Initial Toxic / Oxygen Sensor Monitor Start-Up - Oldham OLCT 200 User Manual

Initial Bridge Sensor Monitor "Span" Check
3.2.3
Prior to the initial Routine Sensor Calibration described in section 4.1, a coarse SPAN
gas reading verification should be performed after installation. After correct Sensor
Volts and BALANCE have been verified, apply an upscale gas value such as 50% LEL
to the sensor. The indicated value should read between 35 and 65% LEL with 50%
LEL gas applied. Larger errors may indicate incorrect sensor wiring or defective
sensor. Remember that this is only a coarse check and precision calibrations are
performed in Routine Sensor Calibrations described in the following section 4.1.
Section 7.4 describes PREAMP GAIN adjustments that may be required if full-scale
ranges are changed.

3.3 Initial Toxic / Oxygen Sensor Monitor Start-Up

OLCT 200 Toxic / Oxygen Monitors, factory equipped with Smart electrochemical
sensors, rarely require adjustments (other than routine calibrations) to provide accurate
readings. However, after installation the following checks should be performed to
insure proper operation. In addition, alarm levels, Measurement Name ASCII fields
and other variables may require attention by users in order to best serve their
application.
Initial Toxic / Oxygen Sensor Monitor "Span" Check
3.3.1
Prior to the initial Routine Sensor Calibration described in section 4.1, a coarse SPAN
gas reading verification should be performed after installation. Apply an upscale gas
value of at least 25% of full scale to the sensor. For example, if 0-100ppm H2S is the
measurement range, apply at least 25ppm but not more than 100ppm. The indicated
value should read within 15% of full scale. Remember that this is only a coarse check
and precision calibrations are performed in Routine Sensor Calibrations described in
the following section 4.1. Section 6.4 describes PREAMP GAIN adjustments that may
be required if full-scale ranges are changed.
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