Piezoresistive Differential Pressure Transmitter
Features
·Full stainless steel construction, compact size, easy
installation;
·Using piezoresistive differential pressure sensor, 316L isolated
diaphragm;
·Temperature compensation and aging, stable performance;
·Zero and span adjustable outside;
Introduction
SPT90 uses piezoresistive differential pressure sensor as sensing
element. Silicon oil is filled in between die and two diaphragms,
when measured differential pressure is added on two diaphragm, the
pressure could be transferred onto die through silicon oil. Sensor
die connects with amplifier circuit through wires, using
semi-conductor’s piezoresistive effect, transforming differential
pressure signal into electric signal. The whole product is used for
differential pressure measurement of petroleum, chemi-industry,
power station and hydrology, etc.
Specification
| Min. | Typ. | Max. | Unit |
| | 0.5 | 0.5 | %FS |
| 0.5 | 0.5 |
| Zero Thermal error | 0～100kPa | | 0.75 | 1.25 | ±%FS, @25℃ |
| 200～3500kPa | | 0.5 | 0.75 |
| FS Thermal error | 0～100kPa | | 0.75 | 1.25 |
| 200～3500kPa | | 0.5 | 0.75 |
| Stability | ≤200kPa | 0.5 | %FS/year |
| ≤3500kPa | 0.2 |
| Static pressure effect | 0.05 | ±%FS, each 100kPa |
| Compensation temp. | 0～50 | ℃ |
| Operation temp. | -10～80 |
| Storage temp. | -40～120 |
Electric Characteristic
| Power supply | 2-wire 15～28VDC 3-wire 15～28VDC |
| Output signal | 2-wire 4～20mADC 3-wire 0/1～5VDC,0～10/20mADC |
| Electric connection | plug connection or Φ7.2mm 7-pin cable |
| Response time(10%～90%) | ≤1ms |
| Insulation resistor | 100MΩ,50VDC |
Construction Material
| Housing | stainless steel 1Cr18Ni9Ti |
| Diaphragm | stainless steel 316L |
| O-ring | Viton |
| Filled liquid | silicon oil |
| Pressure port | G1/4 female |
Environment Condition
| Shock effect | ≤1% at 3gRMS, 30～2000Hz |
| Impact | ≤1% at 100g, 10ms |
| Lifetime | 1×108 pressure cycles |
| Media | liquid or gas which is compatible with construction material |
Order Guide
Order Note
1. We suggest to install tri-valve between the measured point and
transmitter to protect the media adding on transmitter’s positive
and negative cavities slowly;
2. We suggest to make two pressure ports horizontally to reduce
installation direction effect;
3. Please pay attention that the static pressure should be less
than 20Mpa, transmitter positive and negative cavity should be in
the rating pressure range;
4. If the user has special requirement, please feel free to contact
our company.
