ATI
Q45P pH System
Part 4
– Configuration
15
O&M Manual
Rev-B (7/15)
have only about 35% of the capacity of an alkalines. However,
NiMH batteries can be recharged hundreds of times.
The third switch assembly is a single slide switch
(S3)
which
defines whether the 0-2.5 VDC signals from the monitor are
isolated or non-isolated. Output isolation is not required when
outputs are connected to the internal data logger. However, if the
outputs are connected to external devices through the external
connection cable, putting this switch in the ISO position will protect
against possible ground loops. The isolation circuit will slightly
increase the power requirement for the monitor, resulting in a bit
less battery life.
4.3
Battery Power Circuit Board
The Q45 portable instrument is primarily operated by software settings.
However, there are also a few hardware details on the battery circuit board to
note.
The battery board is a circuit board that sits in the rear of the Q45 enclosure, and
connects to the Q45 AUX port through a ribbon cable. The battery board
contains the battery clip for the two AA batteries and the output terminal strip for
the two 0-2.5 VDC outputs. Along the left side below the ribbon cable is an
ON/OFF slide switch. This switch can be used to turn the instrument completely
OFF when not intending to use the unit for an extended period.
4.4
Voltage Outputs
There are two sets of analog voltage outputs on the battery board that may be
used to send isolated data back to remotely located recorders, PLC’s, etc. Output
#1 is used only for pH information, and Output #2 can be used for an additional
pH output channel, or it can be selected to output temperature information.
