Calibration Procedures; Zero Calibrating A Single Sensor Ch. Module - Teledyne 1220 Instruction Manual

Multi-Channel Combustible Monitor
If "FS" is selected, the associated relay is in the Fail-safe Mode,
i.e., the relay is "normally energized".
If "NFS" is selected, the associated relay is in the Non-Fail-safe
Mode, i.e., the relay is "normally de-energized".
Sensitivity Gauge
The Sensitivity Gauge monitors the life of the sensor. It does so
by monitoring successive span procedures throughout the life of
the sensor. As the sensor gets older it's resistance builds,
lessening the sensitivity.
LCD Display
The LCD Display shows the LEL in monitor (RUN) mode,
alarm settings during the configuration mode, and calibration
values during Span and Zero operations.

4.4 Calibration Procedures

4.4.1 Zero Calibrating a Single Sensor Channel Module
NOTE: To accomplish the following task, two operators are needed.
Operator one at the Control Unit and operator two at the
probe. Both operators are involved in the calibration process.
They must be in constant communication, by phone or other
means.
(A) = Operator One at the Control Unit
(B) = Operator Two at the probe
1. (A) At the Front Panel of the Channel Module to be calibrated:
a. Press SELECT.
b. Use the right or left arrow key to highlight the ZERO option.
c. Press ENTER.
Result: Alarms are deactivated and the ZERO display
option flashes.
2. (B) Introduce zero gas into the sensor.
3. (A) After the reading has stabilized:
Teledyne Analytical Instruments
Operation 4
4-7