Drilling Mud Density Transmitters 290 Series DENSTAR
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Key
Benefits
Designed specifically for drilling fluid density measurement application Compact for simple installation. Fully submersible proven construction Stainless steel body and Hastelloy diaphragms for superior corrosion resistance 2 wire 4 to 20 mA industry standard output Intrinsically safe versions available Normal calibration 6.67 to 20 Pounds / US Gallon (0.8 to 2.4 SG) . Alternative calibration as required. Additional temperature compensation available for applications where in service shift is significant Static accuracy +/- 0.25% |
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| The PSM Denstar 290 Series transmitters measure density as a function of differential pressure. Each unit has two pressure sensitive diaphragms, each of which are located at a known elevation in the tank. Under normal operation both diaphragms will be submerged, and since the distance between them is fixed, any variation in the pressure differential between them must be a function of the liquid density. |
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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.
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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 |
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