TS4000H
45
4.10 Remaining Sensor Life
The TS4000H provides an estimate of remaining sensor life, in percent remaining, to provide
the user with an early warning of the need for sensor replacement. The remaining sensor life is
updated each time the unit is calibrated. The current remaining sensor life estimate displays
during the zeroing portion of a calibration sequence. It can also be read using the Modbus
interface. Refer to Section 5.0 for more information.
NOTE:
Remaining sensor life is an estimate of sensor degradation derived from sensor
sensitivity. Because sensor sensitivity is affected by factors other than the natural
sensor degradation, users must establish their own reference by resetting sensor life
whenever these factors are at play. Some examples of these factors are new sensor
installations, sensor replacement, change of the target gas, and changes in the access
of gas to the sensor (e.g. splash guard). If sensor life is not reset, the remaining
sensor life indicator will no longer reflect the true state of the sensor.
4.10.1 Initializing the Remaining Sensor Life
The remaining sensor life estimate must be initialized each time a new electrochemical cell is
installed. The initialization should be done during the first calibration of a newly installed sensor.
After the sensor has been powered for a minimum of one hour, enter Calibration Mode (refer to
Section 4.9). While the display is flashing the remaining sensor life estimate, apply and remove
the magnet, the flashing number changes to “
100
” after about 3 seconds. This indicates that
the sensor life will be reset upon completing calibration.
4.11 Calibration Equipment – Portable Purge Calibrator
A Portable Purge Calibrator is used for field calibration of the TS4000H. The operational /
storage temperature range for the Portable Purge Calibrator is 0°F to +130°F (-18°C to +54°C).
NOTE:
Do not store the cylinder with the regulator fully engaged in the cylinder valve.
To use a Portable Purge Calibrator
1. Make sure the Portable Purge Calibrator contains a gas concentration equivalent to
50% FS for the unit that is going to be calibrated.
2. Ensure that the sensor is exposed to clean air. If it is suspected that background or
interfering gas is present, purge the sensor with clean air.
3. Place the gas cup over the sensor.
4. Apply and remove the magnet and then navigate to “
AC
”, then apply and remove the
magnet to enter calibration.
5. Apply the calibration gas when “
gAS
” is displayed.
6. “
CP
” is displayed when the sensor detects gas (indicating “Calibration in Progress”).
7. “
CC
” is displayed to indicate “Calibration Complete.”
8. Remove the gas by closing the valve on the cylinder and remove the cup allowing the
sensor to read clean air. The display changes from “
CC
” to indicate a few ppm and
then drops to “
0
.”