EST320 Explosion Proof Piezoresistive Pressure Transmitters
EST320 adopts 1Cr18Ni9Ti stainless steel construction, active sensing element of international brands, and the specially designed V/I converting circuit for easy zero/span calibration; non-polarized two-wire output and DC-AC three-wire output; and the buffer head that can prevent water hammer or shocking of 5~10 times of the span.
Featuring small drifts, stable performance and reasonable construction, EST320 is applicable to the pressure measurements of gas and liquid, such as water, oil and other light corrosive liquid and gas.
Features
- Pressure type: Gauge/Seal gauge Pressure
- Range: 0~0.2MPa…60MPa
- Accuracy: ±5%F.S
- Stability: 0.25%F.S/Year(typical), 0.4%F.S/Year(maximum)
- Signal Output: 4~20mA, 0/1~5V, 0.5~4.5V, 0~10V
- Power supply: 10/11~30Vdc, 8~30Vdc, 5V(ratio)
- OEM: Available
| Range | Overload | Precision | Stability | Working Temperature | Insulation | Electric Strength | |
|---|---|---|---|---|---|---|---|
 | 0~0.2MPa...60MPa | 2 times | ±0.5%F.S | 0.25~0.4%F.S/Y | -40～85℃ | >100MΩ@50V | 500V@60 second |
| Output Signal | Power Supply | |
|---|---|---|
| - | 4~20mA | 10~30Vdc |
| - | 0~5Vdc | 8~30Vdc |
| - | 1~5Vdc | 8~30Vdc |
| - | 0.5~4.5Vdc | 5V (Ratio) |
| - | 0~10Vdc | 11~30Vdc |
Application
Constant pressure water supply | CNG | Water supply system of tele-control, telemetering, tele-signaling and tele-commissioning | Central air conditioning | Automatic test system | Well real-time management | Pipe / tank pressure calculation | Heat supply of boilers
Technology
Piezoresistive based transducers rely on the piezoresistive effect which occurs when the electrical resistance of a material changes in response to applied mechanical strain. In metals, this effect is realized when the change in geometry with applied mechanical strain results in a small increase or decrease in the resistance of the metal. The piezoresistive effect in silicon is due primarily to changes at the atomic level and is approximately two orders of magnitude larger than in metals.
Sputter deposited thin film pressure sensor is a kind of Piezoresistive pressure sensors, difference exist that the thin-film sensor consists of a resistor pattern that is vaporized or sputter-deposited onto the force-summing element (the measuring diaphragm). In some transducers the resistors are not directly mounted on the diaphragm but are on a beam linked to the diaphragm by a push rod.
Accuracy and range for EST 3 series
