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 ±5V will cause errors and possible overranging on other analog input channels.

2.When using the CR10 with the PS12LA, remember that the sealed lead acid batteries are permanently damaged if discharged below 10.5 V. 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 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 short (Section 14).

4.There are frequent references in this manual to 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. In addition, the SM16 and SM64 cannot perform many of the functions that the SM192 and SM716 are capable of performing.

5.Voltages in excess of 5.5 volts applied to a control port can cause the CR10 to malfunction.

6.Voltage pulses can be counted by CR10 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.

7.The CR10 module is sealed and contains desiccant to protect against excess humidity. The Wiring Panel and the connections between the Wiring Panel and the CR10 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.

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