Campbell Scientific CR10 CR10 Measurement and Control - Page 12

CAUTIONARY NOTES 1. Damage will occur to the analog input circuitry if voltages in excess of t16 V are applied for a sustained period. Voltages in excess of r5V will cause errors and possible overranging on other analog input channels. 2. When using the CRl0 with the PS12LA, remember that the sealed lead acid batteries are permanently damaged if discharged below 10.5 V. The cells are rated at a7 Ahr capacity but experience a slow discharge even in storage. lt is advisable to maintain a continuous charge on the PS12LA battery pack, whether in operation or storage (Section 14). 3. When connecting power to the CR10, first connect the positive lead from the power source to the 12 V terminal. Then connect the negative lead to G. Connecting these leads in the reverse order creates the possibility of a shoft (Section 14). 4. There are frequent references in this manualto Storage Modules. The Storage Modules referred to are the SM192 and SM716. The old SM16 and SM64 Storage Modules will NOT work with the CR10 without a specially modified cable. ln addition, the SM16 and SM64 cannot pedorm many of the functions that the SM192 and SM716 are capable of performing. Voltages in excess of 5.5 volts control port can cause the CR10 malfunction. Voltage pulses can be counted by Pulse Counters configured for High Frequency Pulses. However, when pulse is actually a low frequency (below about 10 Hz) AND the voltage excursion exceeds 5.6 VDC supply will start to rise, analog measurements. Pulses whose positive voltage po exceed 5.6 VDC with a duration than 100 milliseconds need e)dernal conditioning. See the description Pulse count instruction in Section 9 details on the external conditioning. 7. The CR10 module is sealed and desiccant to protect against excess humidity. The Wiring Panel and connections between the Wiring the CR10 are still susceptible to To prevent corrosion at these poi additional desiccant must be placed the enclosure. To reduce vapor into the enclosure, plug the cable conduit with Duct Seal, a putty-type available at most electrical supply DO NOT totally seal enclosures with lead acid batteries. Hydrogen concentration may build up to levels. vtt