A differential pressure transmitter measures the difference in pressure between two points, rather than absolute or gauge pressure at a single location. It has two input ports:
* High-Pressure (HP) Port – for higher pressure
* Low-Pressure (LP) Port – for lower pressure
The measured value is calculated as:
Pdiff=P(HP)−P(LP)
✅ Example: If the pressure at the HP port is 6 bar and at the LP port is 2 bar, the transmitter will display 4 bar.
✅ Common Applications:
1) Measuring liquid levels in closed tanks – By measuring the pressure difference between the top and bottom of a tank, the liquid level can be determined.
2) Flow measurement in pipelines – Used with flow restriction elements like orifice plates, where the pressure difference is proportional to fluid flow rate.
3) Filter monitoring – Measures pressure drop across a filter to determine clogging and maintenance needs.
| Model | STEX 14 |
| Type | Differential Pressure Indicator Transmitter |
| Range | 75mBarg to 207Barg |
| Output | 4~20mA, Hart, FF, PA |
| Body | Die Cast Aluminium, SS316 |
| Display | LCD with Backlight |
| Sensor Material | SS316, Hastelloy, Tantalum, Ceramic |
| Instrument Connection | 1/2 NPT(M/F) |
| Explosion Proof | II 1G Ex d IIC T6 and Ex ia IIC T6 |
| Ingress Protection | IP67 / 68 |
| Accuracy | 0.1% or 0.05% FS |
| Accessories | 5 Way Manifold, Diaphragm Seal, Capillary Tube, Seal Pot, Flat or L Bracket |
Other options and technical specifications are mentioned in the attached PDF catalog.