Precision Measurement Engineering, Inc.
(760) 727-0300
www.pme.com
11
Coin Cell Battery Life
– The miniDOT Logger uses a coin cell battery for backup of the
clock when the power is switched off. This coin cell battery will supply many years of clock
operation. Should the coin cell battery discharge, then it must be replaced by PME. Contact
PME.
Recalibration
– The miniDOT Logger will maintain its calibration without the necessity of
adjustment by the user. The miniDOT Logger should be returned to PME for recalibration.
We suggest that this be done yearly.
O-Ring and Seal
– When the white pressure housing is screwed on to the black end cap,
then it passes along the o-ring located in the black end cap several revolutions. Keep this o-
ring lightly lubricated with silicone grease or an oil compatible with buna-N o-ring material.
When the miniDOT Logger is opened after deployment, then a small number of water drops
are deposited on the inner surface of the o-ring. When the white pressure housing is
screwed back on to the black end cap, then these drops can become trapped inside the
miniDOT Logger. Be sure to carefully dry the o-ring and adjacent surfaces (especially
underneath) prior to closing the miniDOT Logger. Re-lubricate the o-ring at this time.
LED Indications
– The miniDOT Logger indicates its operation with its LED. The table
below presents LED indications:
LED
Reason
1 Green
Flash
Normal. Presented immediately after new batteries are
installed. Indicates that the CPU has started its program.
1 Green
Flash
Occurs at the time of sampling for sample intervals of 1 minute
or less.
5 Green
Flashes
Normal. Indicates that miniDOT Logger is beginning to record
measurements. This indication appears in response to
switching the Logger Control Switch to “Record.”
5 Red
Flashes
Normal. Indicates the miniDOT Logger is ending recording of
measurements. This indication appears in response to
switching the Logger Control Switch to “Halt.”
Continuously
Green
Normal. Indicates the miniDOT Logger is connected to a HOST
computer via the USB connection.
Continuously
Flashing Red
SD card write error. Try removing/reinstalling batteries.
Contact PME.
