Inquiry (采购产品): Pressure Switches That Meet These Requirements? Requirements for Pressure Switches Document Date August 7, 2006 I SCOPE A This specification covers the functional requirements for Pressure Switches (PSW). II REFERENCES III REQUIREMENTS A This specification covers the functional requirements for Pressure Switches (PSW). All switches must the following minimum requirement. 1 UL Listed or Recognized; evaluated to ANSI/UL 353 a UL Listed Categories MBPR or MFHX b UL Recognized Categories MBPR2 or MFHX2 i Provide UL Conditions of acceptability 2 Operating Conditions – Ambient; rated for continuous duty at 60°C (140?F) unless stated 3 Component Life – a Minimum time to service 10,000 continuous hours b Minimum lifetime 20,000 hours 4 Must be UL rated for DC service a Applied voltage = 24 VDC, Current will be in the milliamp range 5 Single pole, double throw switches preferred. 6 Pressure connection, in order of preference a 1/8” or 1/4" Swagelok Compatible compression connection. b 1/8” Male NPT c 1/8” Female NPT d ?” Male NPT e ?” Female NPT 7 Desired Accuracy - Identifier Medium Trip going high or low Pressure Setpoint Reset Point Qty per System PSW302 Processed Fuel—Natural Gas/ Propane going high 2 psig 4 PSW301 Processed Fuel- Natural Gas/ Propane going low 5 psig 4 PSW711 Purge Gas- 97% N2, 3 % H2 going low 10 psig 12 psig 4 PSW801 Natural Gas/ Propane going low 10 psig 12 psig 1 PSW 851 Natural Gas/ Propane going low 10 psig 12 psig 1 **** Hidden Message ***** Julie Nielsen 1252 Orleans Dr Sunnyvale, CA 94089 USA Company: Ion America Phone: 408-543-1611 Fax: 408-543-1501 E-mail: jnielsen@ionamerica.com **** Hidden Message ***** jnielsen@ionamerica.com
