User guide

User Guide
3
Table 1 Typical Alkaline Battery Service as a Function of Temperature
Temperature (°C) % of 20°C Service
20 - 50 100
15 98
10 94
5 90
0 86
-10 70
-20 50
-30 30
This data is based on one ‘D’ cell under conditions of 50mA current
drain with a 30 ohm load. As the current drain decreases, the percent
service improves for a given temperature.
3. PS100/CH100 Lead-Acid Power Supplies
3.1 Description
The PS100 power supply includes a 12V, 7.0Ah lead-acid battery and a
temperature-compensated charging circuit. The unit can be fitted with optional
modules, such as the A100 null modem adaptor (see section 5).
Figure 1 PS100 Power Supply with optional A100 null modem port fitted
This supply is designed to power the datalogger continuously. Therefore, an AC
transformer (optional) or solar panel should be connected to the PS100 at all
times. The charging source powers the datalogger while float charging the lead-
acid batteries. The internal lead-acid battery powers the datalogger if the charging
source is interrupted.
To prevent people from getting burned, an ABS plastic cover sits on
the heatsink of a PS100 or CH100. The cover is fastened to the
heatsink via a #4-40 x .250 Pan Phillips screw [#395]. The cover
must be removed to attach an A100 or A105 adapter. Some early
models of the PS100 and CH100 did not include the cover and do
not have a place to attach it.
NOTE
NOTE