Campbell Scientific CR10X CR10X Measurement and Control System - Page 12
Cautionary Notes
View all Campbell Scientific CR10X manuals
Add to My Manuals
Save this manual to your list of manuals |
Page 12 highlights
CAUTIONARY NOTES 1. Damage will occur to the analog input circuitry if voltages in excess of ±16 V are applied for a sustained period. Voltages in excess of ±5 V will cause errors and possible overranging on other analog input channels. 2. When using the CR10X with the PS12LA, remember that the sealed lead acid batteries are permanently damaged if deep discharged. The cells are rated at a 7 Ahr capacity but experience a slow discharge even in storage. It 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 CR10X, 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 makes it easier for the positive wire to accidentally touch a grounded component and short out the power supply (Section 14). 4. Voltages in excess of 5.6 volts applied to a control port can cause the CR10X to malfunction and damage the CR10WP wiring panel. 5. Voltage pulses can be counted by CR10X Pulse Counters configured for High Frequency Pulses. However, when the pulse is actually a low frequency signal (below about 10 Hz) AND the positive voltage excursion exceeds 5.6 VDC, the 5 VDC supply will start to rise, upsetting all analog measurements. Pulses whose positive voltage portion exceed 5.6 VDC with a duration longer than 100 milliseconds need external conditioning. See the description of the Pulse count instruction in Section 9 for details on the external conditioning. 6. The CR10X module is sealed and contains desiccant to protect against excess humidity. The Wiring Panel and the connections between the Wiring Panel and the CR10X are still susceptible to humidity. To prevent corrosion at these points, additional desiccant must be placed inside the enclosure. To reduce vapor transfer into the enclosure, plug the cable entry conduit with Duct Seal, a putty-type sealant available at most electrical supply houses. DO NOT totally seal enclosures equipped with lead acid batteries. Hydrogen concentration may build up to explosive levels. viii