| | | Description The OPLC DPCO (shown above right) is a variant of the OPL series 4.5 inch/114mm pressure Swichgage®. The gauge face includes adjustable high and low pressure limit contacts: the visible contacts have a self-wiping action for positive electrical switching. The DPCO model includes a dual-pole front facia switch that allows manual selection of START (idle) or RUN (active) throttle control modes. The OPLC DPCO uses a cast aluminium, weatherproof case, with a hinged front for inspection and wiring connection. Pressure hose connection is via a %" NPT fitting in the base. Application The OPLC DPCO is typically used with a Murphy AT-03069 throttle controller (shown above left) to maintain pressure in an irrigation pump system. The AT-03069 has is a heavy duty throttle controller with high torque, solid state switching and an electronic clutch, making it ideal for many automatic and semi-automatic engine systems: for full details see document AT-04052B. The AT-03069 receives high or low pressure signals from the OPLC-DPCO (see overleaf for typical electrical connection), and throttles the engine in response. The combined system has been designed to maintain near constant pressure, even when the engine is driving multiple irrigation systems. Murphy also recommend the connection of a Murphy PD8183 pulsation dampener in the pressure line to eliminates pointer flutter. | | |
| | | CONTROL SYSTEMS AND SERVICES DIVISION PO Box 1819, Rosenberg, Texas 77471, USA tel: +1 281 633 4500 fax: +1 281 633 4588 email: sales@fwmurphy.com MURPHY DE MEXICO S.A. DE C.V. Blvd. Antonio Rocha Cordero 300, Fracción del Aguaje San Luis Potosí, S.L.P. México 78384 tel: +52 444 8206264 fax: +52 444 8206336 Villahermosa office tel: +52 993 3162117 email: ventasmex@murphymex.com.mx web: www.murphymex.com.mx | | FRANK W. MURPHY LTD. Church Rd, Laverstock, Salisbury, SP1 1QZ, UK tel: +44 1722 410055 fax: +44 1722 410088 email: sales@fwmurphy.co.uk web: www.fwmurphy.co.uk MURPHY SWITCH OF CALIFORNIA 41343 12th Street West, Palmdale, CA 93551-1442, USA tel: +1 661 272 4700 fax: +1 661 947 7570 email: sales@murphyswitch.com web: www.murphyswitch.com | | MACQUARRIE CORPORATION 1620 Hume Highway, Campbellfield, Victoria 3061, Australia tel: +61 3 9358 5555 fax: +61 3 9358 5558 email: murphy@macquarrie.com.au | | |