RKI Instruments 65-2301RK - Manual (Page 16)

12 • 65-2300RK/65-2301RK Toxic Detector
If an application is not very demanding, for example detection in a clean, temperature
controlled environment where toxic gas is not normally present, and calibration
adjustments are minimal at calibration, then a calibration frequency of every 6 months is
adequate.
If an application is very demanding, for example if the environment is not well controlled
or if toxic gas is often present, then more frequent calibration than every 3 months may be
necessary.
Calibration
This section describes how to calibrate the toxic detector. It includes procedures to prepare
for calibration, set the fresh air reading, set the response reading, and return to normal
operation. It describes calibration using a calibration kit that includes a calibration cup,
calibration gas, sample tubing, and a fixed flow regulator with an on/off knob. The
required sample flow rate and calibration cup depend on the detector being calibrated.
Table 2 below lists the required calibration cups and regulators for the various toxic
detectors.
WARNING: Not using the recommended calibration cup, sample flowrate, and specified
flow direction (for 81-1138RK calibration cup only) will result in an
inaccurate calibration. Make sure to use the calibration cup and sample
flow rate listed in Table 2 for your target gas when performing a
calibration. Also make sure to connect the sample tubing to the calibration
cup port that results in the specified flow direction for the 81-1138RK
calibration cup.
Preparing for Calibration
1. Unscrew the splashguard from the detector housing cap. Make sure the cap remains
securely screwed onto the housing body.
2. Push the calibration cup onto the plug-in sensor that sticks through the housing cap.
The calibration cup seals to the sensor with an O-ring.
Table 2: Required Calibration Cups and Flow Rates
Detector Type
Required
Calibration Cup
Required Regulator/
Flowrate for Calibration
Gas
Flow Direction
Specified on
Calibration Cup
Arsine (AsH
3
) 81-1138RK 81-1051RK, 0.5 LPM (liters
per minute) Yes
Chlorine (Cl
2
), 0 - 3.00 ppm
and 0 - 10.0 ppm
81-1138RK-CL2 81-1051RK, 0.5 LPM No
Hydrogen Cyanide (HCN) 81-1138RK 81-1051RK, 0.5 LPM Yes
Ammonia (NH
3
) 81-1138RK-NH3 81-1051RK-25, 0.25 LPM No
Phosphine (PH
3
) 81-1138RK 81-1051RK, 0.5 LPM Yes
Sulphur Dioxide (SO
2
) 81-1138RK 81-1051RK, 0.5 LPM Yes