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SD-400 User Handbook [v7]
17
6. Instrument Power Supply Systems
Low Power Warnings
The SD-400 instrument uses two-stage low power warning system:
a. First Stage - Flashing WAIT Light
Plus Triple, Low Pitched Beep
Power is low, but the instrument can still be used –
with no effect on breath sampling or analytical
accuracy.
Disposable batteries should be changed as
soon as possible once this warning appears:
rechargeable battery packs should be charged.
b. Second Stage - Four Flashing Bars (- - - - )
Plus Two Long, Low Pitched Beeps
Battery power is too low for instrument operation, so
further use of it is automatically inhibited.
AA Power Supply Unit [PSU]
To replace the batteries, ensure the instrument is switched off, then
press the release catch on its back and slide down the battery pack
to remove it. Remove all five batteries and replace with five new
alkaline ones, ensuring correct polarity. Now slide the power supply
unit into place, ensuring the release catch clicks positively to lock.
Use Only Alkaline AA Batteries
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