Hastelloy C276 Pressure Transmitter – 4–20 mA + HART | 2,900 PSI MWP | -260 to 260 in H₂O Range

What pressure, flow and temperature is it rated for?

This transmitter is rated for 2,900 PSI maximum working pressure and measures differential pressure from -260 to 260 inH₂O (span limits 2.6 to 260 inH₂O at 20°C). The listing does not specify operating temperature limits; ask the seller for the full temperature range, which for silicone oil fill units typically extends from -40°F to around 250°F depending on housing and electronics specifications. This is a differential pressure transmitter, not a flow meter—it measures pressure drop, which can be used to infer flow when installed across an orifice plate or other primary element.

What gases is it compatible with, and has it been oxygen cleaned?

Differential pressure transmitters measure pressure through isolated diaphragms and do not have direct gas compatibility constraints like wetted-component devices; the Hastelloy C276 diaphragms provide chemical resistance to corrosive process media. The listing does not state whether this unit has been oxygen cleaned or prepared for oxygen service—if you require O₂ cleaning or hydrocarbon-free certification, confirm with the seller before purchase.

What materials are the wetted parts?

The diaphragms are Hastelloy C276, and the filling fluid is silicone oil. The listing does not specify the materials of other wetted components such as the process connection flanges, bolting, or O-rings—request a full materials of construction list from the seller if compatibility with specific process chemicals is critical to your application.

What should I inspect before putting it into service?

Verify the diaphragms for any physical damage, confirm the model tag matches the 364DSGSHQ0S1 code string to ensure configuration matches your needs, and check that process connections are clean and undamaged. Perform a bench calibration to verify the 4–20 mA output tracks accurately across the -260 to 260 inH₂O range, test HART communication if you'll be using digital configuration, and confirm zero and span adjustments respond properly—new units can shift during storage and shipment.