www.tek-trol.com
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Product Description
This specification covers the reference and specification data, as well as ordering information.
2.1
Introduction
Tek-Bar 3120B Exp Absolute/Gauge Pressure Transmitter utilizes world’s leading mono crystal silicon
pressure sensor technology. It can handle rigorous industrial applications and it can withstand extreme
chemical, mechanical and electrical working conditions. Highly accurate and reliable measurement of
level and pressure of liquid, gases or steam. The performance accuracy is up to 0.04% of URL. This
high-performance pressure transmitter meticulously designed by Tek-Trol supports HART
communication protocol or Modbus RS485 and IP67 waterproof protection. It is well equipped with
several features that facilitate easy installation, start-up and minimum maintenance.
2.2
Measuring Principle
The Tek-Bar 3120B works on the principle of Piezo technology. The pressure sensor is located on the
top of the body, away from the service fluid. This enables mechanical and thermal isolation of the
sensor from the fluid in service.
When pressure is applied on the diaphragm and the Piezo sensor, they become stressed and undergo
a change in voltage resistance. This change in resistance is directly proportional to the applied
pressure, which is transferred to the transmitter body using lead wires.
Built on semiconductor technology, the resistance change (piezoelectric effect) is notably higher than
exhibited in standard strain gauges. Therefore, the sensitivity of monocrystalline sensors is higher than
the sensitivity of most other types.
Fig 1: Tek-Bar 3120B Exp Absolute/Gauge Pressure Transmitter
P
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P
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2
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5
5
4
4
4
3
3
1
Reference pressure
2
Measuring cell
3
Process connection
4
Seal diaphragm
4
Filling liquid
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Relative pressure sensor
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Pressure as input variable
1
Measuring cell
2
Process connection
3
Seal diaphragm
4
Filling liquid
5
Absolute pressure sensor
P
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Pressure as input variable
