© 2022 All rights reserved. Data subject to change without notice.
57
Rev. B | 2022.03
LPT-M - Operation Manual
the alarm set points should be indicated on a label on the front door of the
enclosure so anyone working in the environment can be aware.
Equipment: Calibration Kit, Calibration gases, digital multi-meter, magnetic
wand
Users can order the calibration kit, calibration accessories and / or gases
from any CETCI authorized distributor or you can supply your own gas and
equipment as long as the gas meets the minimum specifications. CETCI does
not ship gas cylinders outside of Canada.
7.1.5 Gas Testing Frequency (Bump Testing)
For the purpose of safety in OHS applications, sensors should be gas tested
(bump tested) once every month to confirm response and alarm activation.
7.1.6 Sticky Gases
Sticky gases, such as Ozone (O
3
), Chlorine (Cl
2
) and Hydrogen Chloride (HCl)
adhere to surfaces including tubing and splash guards. When calibrating a
sticky gas sensor we suggest using Teflon lined tubing so the gas doesn’t
adhere to the tubing, reducing the concentration of the flow of gas. Also keep
the length of the tubing as short as possible, no more than 0.91 to 1.22 m /
3 - 4 ft so the gas flow concentration doesn’t lessen over the distance from the
gas cylinder to the sensor. If a splash guard is required for an LPT-M Modbus®
Transmitter with an Ozone, Chlorine, Chlorine Dioxide, Hydrogen Chloride,
Hydrogen Cyanide or Phosphine sensor the special sticky gas splash guard
(Option -SN) must be ordered.
It is also suggested that when calibrating a Chlorine sensor, you use a chlorine
gas generator due to the instability of Chlorine gas in a cylinder and the fact
that it is difficult to get accurate readings from that source.
7.1.7 Non-Intrusive Calibration
Calibration can normally performed without opening the unit by using a
