The two diaphragms are hydraulically linked within the sensor’s construction. The lower diaphragm is “rated” to give a known displacement in response to applied pressure, while the upper is compliant and simply transfers the pressure it measures via the internal hydraulic fill to the rear of the rated diaphragm. Actual displacement of the lower diaphragm is measured using an internally mounted Linear Variable Differential Transformer.  

The remote amplifier module receives the LVDT’s output signal and conditions it to provide a 4 to 20 mA output over the required span. For convenience this amplifier may be sited up to 100 Metres away from the sensor. It also incorporates the zero and span adjustment facilities, greatly simplifying initial installation / commissioning and subsequent calibration checks 

PSM’s unrivalled experience in the design of pressure sensitive diaphragms and their application in the Marine / offshore sector, together with a versatile approach to unit construction, ensures optimum  performance for all applications. 

The unit is of a completely submersible construction suitable for pole suspension or clamping in place. Custom mechanical variations can be accommodated on request. 

 The design is ATEX approved for use in Hazardous Area’s  and employs the same construction techniques & principles as PSM’s range of Marine duty Hydrostatic level transmitters which carry type approvals from  all major Classification societies.

SENSOR

Construction: Body assembly 316L stainless Steel Diaphragms Hastelloy C276
Mounting: External flanged or threaded, or internal submersed
Standard Range: Density span 0.8 to 2.4 (others on request)
Fluid fill: Silicon fluid.
Operating temperature: -10 to +80° C
Temperature compensation: As required by application

AMPLIFIER MODULE

Construction: Wall mount GRP enclosure
Enclosure rating: IP65 (IP67 option) / NEMA 4X
Power supply: 12 to 30 Vdc
Signal output: 4 to 20 mA dc, 2 wire.

PERFORMANCE

Accuracy: +/-0.25% of set span
Temperature coefficient: +/- 0.02% set span/°C range & zero
(compensated unit)
OPTIONS

Intrinsically safe unit available To EEx ia IIC T6 

transmitter