Sensor
selection:
Thermistors will not withstand the high flue gas temperatures
and cannot be used. RTD’s are the most stable and accurate
sensors up to 400C and are normally selected for this range.Thermocouples
are extremely rugged and durable at high temperatures and are
the best choice for measurements from 400°C to 1200°C.
We TIG weld the thermocouple junction to the tip of the sheath
in order to ensure the fastest possible response time. We add
2-wire 4-20mA transmitters if your panel will not accept RTD's
or thermocouples directly.
Construction
Our flue gas temperature transmitters are constructed using
the same technique we use in the industrial sensors we supply
to power plants and heavy industries. The RTD or thermocouple
is embedded in magnesium oxide, packed and sealed within a stainless
steel sheath. Because the sensor is so well protected from shock
in this construction, long life is ensured, even under the most
severe conditions. We incorporate a flange in our standard design
in order to make mounting easy. The terminal box containing
the transmitter electronics is mounted on a stand-off to minimize
heat transfer from the flue gas to the electronics. The electronics
convert the sensor signal to a standard 4 to 20mA 2-wire signal,
for simple, economical and reliable wiring over long transmission
lines.
Technical Data
RTD models
Operating Temperature: -50 to + 400°C
Optional 4-20mA transmitter Ranges: 0 to +200°C or
0 to +400°C, others on request. The temperature of the head
containing the transmitter has a maximum temperature of 70°C.
Thermocouple
models
Operating Temperature: -50 to + 1000°C
Optional 4-20mA transmitter Ranges: 0 to +600C or 0 to
+1000°C, others on request. The temperature of the head
containing the transmitter has a maximum temperature of 70°C
All
models
Supply Voltage: 13 to 30 Vdc (24Vdc nominal)
Output: 2-wire 4 to 20mA
Data
Sheet
Installation
& Operation
Flue
Gas Temperature Transmitters
