MPD Operating Manual
9
3/4” NPT or M25 Threads
Sensor Cell
Sensor Retainer
and Locking Screw
1.875 [47.63]
2.080
3.016
[76.62]
2.016
[51.21]
(All dimensions reference)
20AWG Stranded Wire
7.5 [190.5] Nominal Length
[52.83]
Figure 1. Multi-Purpose Detector (MPD)
1.2 Principle of Operation
1.2.1 Catalytic Bead Sensor MPD-**-CB1
The CB1 sensor, catalytic bead type contains two elements which are heated by a
dened constant electrical current from the transmitter. One element is sensitive to
the presence of combustible gas, the second element compensates for changes in
temperature. When a combustible gas is present, the sensing element temperature
increases due to catalytic oxidation of the gas. The resistance of the element is
proportional to temperature and is proportional to a change to gas concentration.
The catalytic bead sensor provides the broadest range of combustible detection,
widest temperature range and performance approvals.
1.2.2 Infrared Sensor MPD-**-IF1, IV1, IC1
The IF1, IV1and IC1sensors use Non-Dispersive InfraRed (NDIR) Adsorption
techniques to detect a gas or family of gases. The sensor cells contain a long life
tungsten lament infrared light source, an optical cavity into which gas diffuses,
a dual temperature compensated pyroelectric infrared detector, and integral
semiconductor temperature sensor and electronics to process the signals from
the pyroelectric detector.
The IV1 sensor can measure methane concentration in the range of 0-5%Vol or
0-100%LEL. The IF1 sensor can measure propane concentration in the range of
0-100%LEL. The IC1 is used for carbon dioxide monitoring in the rage of 0-5% Vol.
1.3 Accessories
The following accessories are available for use with the sensors:
a. Collecting Cone (Figure 3).
b. Weatherproof Cap (Figure 4).
c. Sample/Calibration Gas Flow Adaptor (Figure 5).
d. Remote Gassing Port (Figure 6).
e. Duct Mount Kit (Figure 7).
f. Filters
To Next Page
Loading...
Need help?
General
