The CDA incinerator thermometer is intended for measurement of the atmosphere temperature in waste incinerators. The CDA thermometer can be used for gas or flame temperature measurement in a variety of other plant situations provided there is a sufficient path length. The non contact infrared thermometer reading is unaffected by cold CO2 so it will “ see through” a cold combustion atmosphere to measure a hot atmosphere beyond.
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In an incinerator it can be pictured as an “invisible thermocouple” extending into the atmosphere above the bed by perhaps 2m/6.5ft (penetration depth depends on atmosphere conditions). In use it is fitted wholly external to the incinerator, usually to a flanged tube penetrating the wall.
The CDA incinerator thermometer fits the standard LAND System 4 thermometer mounting accessories and protection jackets which can be air or water-cooled. The sighting tube should normally be air-purged.
The incinerator thermometer operates on a simple 2-wire loop connection and outputs a 4 to 20mA signal linear with temperature.
The thermometer reading is insensitive to the presence of gases other than CO2 and is relatively insensitive to particulate matter in the atmosphere - i.e. it measures true gas temperature.
As an approximate guide, good measurements are possible for temperatures above 600°C/1112°F, at CO2 concentrations above 4% and for path lengths of a few metres. At higher temperatures lower concentrations and/or shorter paths can be measured.
Specification
Temperature range:
400 to 1800°C/752 to 3272°F
Output:
4 to 20mA linear (2-wire loop connection)
Field of view:
20mm/0.79in parallel to 600mm/23.6in (nominal)
Response time:
1 to 10 seconds adjustable
Emissivity Adjustment:
0.10 to 1.00 in 0.01 increments
Resolution:
1°C/2°F
Accuracy (absolute):
<0.5% Kelvin over 600 to 1600°C/1112 to 2912°F
<1% Kelvin over 400 to 600°C/752 to 1112°F
<1% Kelvin over 1600 to 1800°C/2912 to 3272°F
Ambient operating temperature:
0 to 50°C/32 to 122°F
Drift with ambient temp:
<2° per 10° ambient change
Drift with time:
<1°C/2°F per year
Power supply:
11 to 45V d.c.
Sealing:
To IP65/NEMA4X requirements
CE:
EN 50-082-2 (immunity), EN 50-081-1 (emission), IEC 1010 (safety)
Vibration:
3G, any axis, 10 to 300Hz
A further leaflet (available on request) indicates how the measurement precision varies with temperature, CO2 concentration and path length.
