P640 Series_Indicating type differential pressure switch with bellows element
Service intended
The P640 series are designed to measure differential pressure from 25 kPa to 2.0 MPa at static pressure 10 MPa and have electrical contact. A set of two stainless steel bellows mounted on a force balance allows direct reading of the actual differential pressure.
| Nominal diameter | 150 mm |
| Accuracy | ±1.0 % of full scale ±1.5 % of full scale |
| Scale range (MPa, kPa, bar, mbar) | 0 ~ 25 kPa to 0 ~ 0.25 MPa (P641 model) 0 ~ 0.4 MPa to 0 ~ 2.0 MPa (P642 model) |
| Static pressure | Max. 10 MPa |
| Working temperature | Ambient : -20 ~ 65 °C Fluid : Max. 100 °C |
| Degree of protection | EN60529/IEC529/IP55 |
| Temperature effect | Accuracy at temperature above and below the reference temperature (20 ℃) will be effected by approximately ±0.5 % per 10 ℃ of full scale |
Standard features
| Pressure connection | Stainless steel (316L SS), Monel and Hastelloy-C |
| Element | Bellows Stainless steel (316L SS), Monel and Hastelloy-C |
| Case and cover | ALDC12.1, Black painted Screwed type |
| Window | Safety glass |
| Dial | White aluminium with black graduations |
| Filling liquid for differential cell | Silicone oil |
| Pointer | Black painted aluminium alloy (Zero adjustable) |
| Contact | Contact rating : AC 250 V 3 A / 125 V 5 A DC 250 V 0.2 A / 125 V 0.4 A / 30 V 4 A Dielectric strength : AC 500 V / MIN Type : Micro contact, One and two SPDT |
| Conduit connection | ¾” PF(F) |
| Process connection | ¼” NPT(F) ½” NPT(F) at 3-way and 5-way manifold valve |
| Standard accessories | Mounting bracket for 2″ pipe mounting with silver gray finished steel |
| Option | ■ Remote seal – Not available with less than 40 kPa of differential pressure range ■ Mounting bracket with 316SS for 2″ pipe ■ 3-way manifold valve (316SS, Monel) ■ 5-way manifold valve (316SS, Monel) |
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