User guide

PS100, CH100 & BP-ALK Power Supplies
2
Before installing the alkaline batteries, connect all necessary sensor leads, control
lines and power leads. The datalogger can be turned off and on by disconnecting
and reconnecting the in-line connector between the BPE-ALK and the datalogger.
The battery connector and in-line connectors fitted to all power
supply variants are 2-pole versions of the Molex Mini-Fit Jnr.
series.
You can remove and replace battery packs from all current dataloggers without
losing your stored program or data. However, if you wish to replace the batteries
without interrupting a current running program, do the following:
1. Connect an external battery directly to the datalogger 12V terminals.
2. Remove the old batteries.
3. Replace with new alkaline D-cell batteries.
4. Remove the external battery.
Where this is to be done on a regular basis a second, spare alkaline battery pack
can be bought. Each pack is supplied with a spare set of connection leads
including a mating connector and free end for wiring into the datalogger. This free
end can be detached and permanently wired into the datalogger resulting in two
connectors attached to the datalogger. To change the battery pack, simply plug the
new pack into the spare battery connector and remove the old one.
A fresh set of eight alkaline D cells provides 12.4V to the datalogger with a
nominal rating of 10Ah capacity at 20°C. The amp-hour rating decreases with
temperature, as shown in Table 1. The battery voltage can be monitored by using
the appropriate datalogger programming instruction. Please note that this will be
approximately 0.3V less than the actual battery voltage because of the diode
incorporated in the battery carrier. Replace the alkaline cells before the battery
voltage (as seen at the datalogger terminals) drops below 9.6V.
NOTE