User Manual Q&AAnswer
Feb 26, 2025 - 06:09 AM
To install and operate the ARSCROFT B700XD2 P-Series Snap Action Switches with Dual Seal Rating, please follow the instructions below:
1. Ensure that you do not exceed the electrical, pressure, or temperature ratings mentioned on the nameplates of the switches. Before removing the electrical cover, always turn off the power.
2. Install the switches in accordance with the National Electrical Code or other applicable specifications.
3. It is crucial to ensure that the process fluid type and temperature are compatible with the wetted materials indicated on the nameplates.
4. The Ashcroft® dual diaphragm pressure actuator is designed to meet the requirements of ANSI/ISA-12.27.01-2003 for process sealing between electrical systems and flammable or combustible process fluids.
5. The dual seal rating of the switches has been tested by CSA and is part of CSA File LR 55541.
6. The basic operation of the Ashcroft pressure switch actuator involves a sensing piston exposed to process pressure. When the pressure on this area reaches the set point, the switch actuates. Different ranges are achieved by using various area pistons and springs.
7. The dual diaphragm design includes a primary or sensing diaphragm and a secondary or redundant seal diaphragm. In the unlikely event that the primary diaphragm ruptures, the secondary diaphragm prevents process fluid from entering the switch enclosure. A vent is provided to indicate a primary seal failure.
8. The XD2 option is available for B700, PPA, PPD, and PPS switches in the pressure ranges of 15 psi to 600 psi.
9. For inches of water ranges, the D700, PDA, PDD, and PDS switches are used as pressure switches, not differential switches. The H connection is used as the process input, and the L connection is used as the vent.
For further information or specific installation details, please refer to the ARSCROFT B700XD2 P-Series Snap Action Switches with Dual Seal Rating Instruction Manual provided with the product.
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