When either of the air purge options is required, the conduit fitting option is also required. Static purge pressure (the pressure required to insure that a hazardous atmosphere does not enter the housing) must be above 0.2 inches of water (0.05 Kilopascals) for installations that require N.F.P.A. 495-1982 specification. For installations that require Canadian Electrical Code C22.1- 1986 specification, pressure must be above 0.25 Kilopascals (1.0 inches of water). This is measured on the gauge (after housing has been purged) with valve in the closed position. Application Alert This housing is NOT equipped with over pressure protection. Maximum working pressure should not exceed 2.49 Kilopascals (10 inches of water). Purge flow rate (the time required to purge 5 or 10 volumes of air through the housing) is determined by: Turn the valve to its vent position and read the gauge to determine hous ing purge pressure. Find that pressure on the appropriate chart provided below. Determine the size of the housing that is being purged and read from that column the length of time required to purge the system with your housing pressure. This number, in minutes, should be permanently marked in the space provided on the warning label on the housing door.     Set the following jumpers and switches before operating the rack: Rack address switch (on the front of the Rack Interface Module) Transducer jumpers on each I/O Module, as required Certain I/O Modules have switches to control their mode of operation. Examples include: – RIM and Comm Gateway I/O’s that support both RS232 and RS422 have a protocol selection switch – Overspeed and non-TMR Relay I/O’s have Normally Energized/De energized Relay mode switches – Comm Gateway I/O’s that support RS485 have termination mode switches Setup phone connection to rack / host (if you use an internal or external modem) Phone cable to internal modem in rack OR Phone cable to modem and RS-232 cable from modem to rack TMR / SIM jumper on the inside of the 3500 Rack backplane between the Power Supply and the Rack Interface Module as shown in the diagrams below.     The prices of all products of Zhangzhou Fengyun may fluctuate at any time. The specific price is subject to the customer service quotation. Please confirm the model, product, price and other details with the customer service before placing the order. Second-hand and brand-new products are sold in the store. Please contact the customer service for details.   Recommended ABB related models： Bently Nevada 106M1081-01 Bently Nevada 106M1079-01 Bently Nevada 125680-01 Bently Nevada 125720-01 Bently Nevada 125760-01 Bently Nevada 125768-01 Bently Nevada 125800-01 Bently Nevada 125840-01 Bently Nevada 125840-02 Bently Nevada 128229-01 Bently Nevada 130733-01 Bently Nevada 133292-01 Bently Nevada 133323-01 Bently Nevada 133396-01 Bently Nevada 133819-02 Bently Nevada 135137-01 Bently Nevada 135473-01 Bently Nevada 136188-01 Bently Nevada 136188-02 Bently Nevada 136483-01 Bently Nevada 138607-01 Bently Nevada 146031-01 Bently Nevada 146031-02 Bently Nevada 149992-01 Bently Nevada 167699-02 Bently Nevada 176449-08 Bently Nevada 1900/65A Bently Nevada 1900/65A-00-00-02-00-00 Bently Nevada 1900/65A-00-02-01-01-01 Bently Nevada 1900/65A-01-00-01-00-00 Bently Nevada 1900/65A-01-01-01-00-00 Bently Nevada 1900/65A-01-01-03-00-00 Show More Show Less