Differential Pressure Transmitter Spriano SST57B

What is it?

The SST57B is a smart differential pressure transmitter that uses a piezoresistive sensor and microprocessor electronics to measure very small to very high differential pressures. It provides a 4–20 mA output with HART communication and includes a local LCD display with pushbuttons for setup.

Where is it used?

It is used in industrial processes where accurate differential pressure monitoring is essential, such as filtration, flow measurement with primary elements, and level measurement in pressurized tanks. Its ATEX approval makes it suitable for hazardous areas including oil & gas, chemical, and energy plants.

How does it work?

The device senses pressure differences between its two process ports using a piezoresistive sensor. The microprocessor processes the signal, applies temperature compensation, and outputs a 4–20 mA signal with HART data. The LCD shows the measured value and allows local configuration of parameters.

What problems does it solve?

It provides stable, accurate differential pressure measurement even under harsh conditions, thanks to high accuracy, low drift, and temperature compensation. It reduces maintenance, works in hazardous areas, and simplifies setup with both local buttons and HART configuration.

Measurement

Type: SMART differential pressure transmitter
Differential pressure ranges: from 1.2 mbar up to 20,000 mbar (depending on model)
Static pressure rating: up to 200 bar
Accuracy: ±0.1% FS (typical), versions with ±0.075% FS available
Long-term stability: < 0.1% FS per year
Temperature compensation: Automatic via internal PTC sensor

Output & Electronics

Output signal: 4–20 mA (2-wire) + HART® communication
Damping: 0–60 s adjustable
Response/update time: approx. 1 second
Zero/span adjustment:
- Zero: ±15%
- Span: 10–100% of calibrated range
LCD display: Wide, configurable units and diagnostics

Environmental Limits

Ambient temperature: –40 °C to +80 °C
Process temperature (wetted parts): depends on diaphragm/flange, typically –40 °C to +120 °C
Storage temperature: –40 °C to +90 °C
Humidity: 0–100% RH

Mechanical Design

Housing: Die-cast aluminium, epoxy-coated
Protection rating: IP66
Process connections:
- 1/4" – 1/2" NPT
- Flanged options available depending on version
Sensor technology: Piezoresistive measuring cell

Certifications

ATEX: II 1G Ex ia IIC T6/T5/T4 Ga, suitable for Zones 0, 1, 2
PED: Compliant
EMC: Compliant
SIL capability: SIL 2

Options

Remote mounting
Oxygen service cleaning
High-temperature diaphragm/seals
Different wetted materials (AISI 316L, Hastelloy, etc.)

Interested?