Det-Tronics TXL Series Gas Transmitter - Manual (Page 14)

CALIBRATION
FREQUENCY OF CALIBRATION
The TXL detector is typically utilized to protect human
life. For this reason, a frequent calibration inspection is
recommended. The specific frequency required in dif-
ferent applications can vary depending upon the
amount of background gas, concentration of gas, and
ambient environmental conditions.
Calibration must be performed:
– When a new system is initially put into service.
– When the sensor or TXL detector housing is replaced.
– If a transmitter, controller or other device used in con-
junction with the TXL detector is replaced.
– When the hydrophobic filter is cleaned or replaced.
The following calibration schedule is recommended
when placing a new sensor into operation and will
ensure reliable operation in most applications:
1. 24 hours after initial power-up
2. One week later
3. Every 30 days thereafter, or as determined by the
needs of the specific application.
IMPORTANT
To ensure adequate protection, the gas detection
system must be calibrated on a regularly sched-
uled basis.
CALIBRATION GAS
For best results, calibration should be performed using
a calibration gas concentration equal to mid-point of the
sensor's measurement range. Calibration kits are avail-
able from Detector Electronics to ensure accurate cali-
bration. Each kit provides the proper compressed gas,
pressure regulator, hose, and special calibration cup for
the TXL detector. If background gas is present, it may
be necessary to purge the detector with clean air to
ensure that an accurate zero or “clean air” condition is
present prior to initiating calibration. A bottle of “clean
air” is provided with the calibration kit for this purpose.
IMPORTANT CALIBRATION NOTES
• Ensure that the proper gas type and concentration is
being used for calibration.
• Ensure that only clean air is present at the sensor prior
to entering the calibration mode. If the possibility of
background gases exists, purge the sensor with clean
air to ensure accurate calibration.
• Ensure that the concentration of the calibration gas
matches the calibration gas setting (Det-Tronics sup-
plied calibration gas cylinders are labeled). Typically,
a calibration gas concentration equal to 50% full scale
is used.
12 95-8541 1.1
Model Full Scale Adjustment Range (PPM) Increment Factory Default Setting
TXL-CL2 5 - 20 5 20
TXL-CLO2 5 - 10 5 10
TXL-CO 50 - 1000 50 1000
TXL-HCN 10 - 50 10 50
TXL-H2S 50 - 500 25 500
TXL-NH3 50 - 200 50 200
TXL-NO2 5 - 50 5 50
TXL-O2 25% - 40% 5% 40%
TXL-PH3 5 - 20 5 20
TXL-SO2 5 - 20 5 20
Table 11—Full Scale Range Adjustment for TXL Gas Detectors