User guide

PS100, CH100 & BP-ALK Power Supplies

Table 3 Typical Battery Capacity for Lead-acid Batteries

as a Function of Temperature

Temperature

(°C)

% of 20°C

capacity

Capacity (Ah)

NP7-12 NP12-12 NP17-12 NP24-12

40 110 7.7 13.2 18.7 26.4

20 100 7 12 17 24

0 84 5.9 10.0 14.2 20.2

-20 72 5.0 8.6 12.2 17.3

N.B. these figures only apply to low discharge rates.

It is recommended that the batteries should not be deeply

discharged below -20°C as there is a risk of ice formation

within the battery which can cause permanent damage.

3.2 AC Adapters (Transformers)

Two different 230V adapters are available from Campbell Scientific Limited in

Europe for use with the lead-acid power supply units. They have different

characteristics in use as explained below. Adaptors with different AC supply

voltages are available to special order.

3.2.1 AC-ADAPT

The AC-ADAPT is only suited for desktop use in low current applications. It can

provide up to 1.2A. If the transformer unit overheats, which is only likely to occur

if the output is short circuited, a safety mechanism will shut it down. In this

unlikely event, reset the safety mechanism manually by removing AC power,

tracing and eliminating the cause of the short circuit, and allowing the transformer

to cool before re-connecting to the mains supply.

The AC-ADAPT is provided with a fixed length of cable on the output side. Many

installations will require this cable to be extended using a suitable length of

compatible cable and an in-line connector. This extension cable is not supplied by

Campbell Scientific unless specifically ordered.

3.2.2 AC-ADAPT2

The AC-ADAPT2 transformer is suitable for permanent installations which

require a wall mounted unit. It is capable of providing more current than the

charger unit needs and so is able to recharge batteries at the maximum rate, and

still provide high current levels to equipment via the power supply. If the

transformer unit overheats, which is only likely to occur if the output is short

circuited, a safety mechanism will shut it down. In this unlikely event, reset the

safety mechanism manually by removing AC power, tracing and eliminating the

cause of the short circuit, and allowing the transformer to cool before re-

connecting to the mains supply.

The AC-ADAPT2 is not provided with output cable unless specifically ordered.

The adapter is fitted with two screw-down terminals for you to connect a suitable

length of cable as required for your application. To fit the cable to the

CAUTION