4
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CLASSIC
®
800 Product Manual
Introduction
II. PRINCIPLE OF OPERATION
The Kayden CLASSIC sensor probe incorporates two RTDs and a heating element.
•
The Reference RTD senses the temperature of the
process.
•
The Heating Element applies heat to the Active RTD.
The CLASSIC 800 Series uses a constant heater power
(configured by the operator).
•
The electronics module calculates the thermal signal
based on the temperature difference between the two
RTDs.
•
The difference in temperature between the two RTDs
varies according to the heat dissipated by the media.
•
A change in process (Flow, Level, or Interface) results in a
change in Thermal Signal %.
The Thermal Signal depends primarily on:
1)
The thermal conductivity of the process media.
2)
The velocity of the process media past the sensor.
Active RTD
Heating Element
Reference RTD
4-20 mA Thermal Signal
Relays (2)
Modbus RTU
SENSOR (PROBE)
ELECTRONICS MODULE
OUTPUTS
Active RTD
Heating Element
Reference RTD
4-20 mA Thermal Signal
Relays (2)
Modbus RTU
SENSOR (PROBE)
ELECTRONICS MODULE
OUTPUTS
Figure 2 - CLASSIC 800 Probe & Outputs
