Campbell Scientific CR10X CR10X Measurement and Control System - Page 130
Using The Switched 12 V To, Power Sensors
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SECTION 8. PROCESSING AND PROGRAM CONTROL EXAMPLES 14: Scaling Array (A*Loc+B) (P53) 1: 8 Start Loc 2: 4 A1 3: 0 B1 4: 6 A2 5: 0 B2 6: 9 A3 7: 0 B3 8: 11 A4 9: 0 B4 15: Z=F (P30) 1: 0 2: 0 3: 12 F Exponent of 10 Z Loc 16: Beginning of Loop (P87) 1: 0 Delay 2: 4 Loop Count 17: Z=X+Y (P33) 1: 8-- 2: 12 3: 12 X Loc Y Loc Z Loc 18: End (P95) 19: Z=X*F (P37) 1: 12 2: 1 3: 284-- X Loc F Z Loc 20: End (P95) 21: End (P95) End Program 22: P End Table 3 * A 01: 2500 02: 270 Mode 10 Memory Allocation Input Locations Intermediate Locations 8.12 USING THE SWITCHED 12 V TO POWER SENSORS In this example, it is required to measure air temperature at two levels at a remote site where AC power is not available. The station is powered with a 12 V battery that is trickle charged by a solar panel. Two 12 VDC aspirated thermocouples (ASPTC) are used measure air temperature. To minimize the current drain of the ASPTCs, the fans are turned on 20 seconds before the CR10X measures the thermocouples. Immediately after the thermocouple measurements are made the fans are turned off. The Switched 12 V terminal on the CR10X wiring panel is used to power the ASPTCs. The maximum amount of current that the Switched 12 V terminal can source is 600 mA. Each ASPTC draws 140 mA, for a total ASPTC current requirement of 280 mA. The Switched 12 V terminal is operated with Control port 1. Connect a short jumper wire between Control port 1 and the Switched 12 V Control (see Figure 8.12-1). 8-22
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