CARD AND ELECTRONIC MODULE; FEATURES: LOSS CHECKER; EQUIPMENT: CONTROLLER; COMPONENT: ELECTRONIC MODULE; CONTROLLER FOR VERIFICATION OF LOSSES IN GAS PIPE FOR SHUT-OFF TYPE VALVES, DOWNSTREAM AND UPSTREAM MEASUREMENT, SUPPLY 11 0VAC, WITHOUT INLET PRESSURE LIMITATION (USES EXTERNAL PRESSURE SWITCH).; BRAND 1: SIEMENS; N-PART 1: LDU11.523A17; MODEL 1: LDU11