Perma Pure Baldwin-Series M225 - Manual (Page 15)

Section I: Description of Options 15
I: D
ESCRIPTION OF
O
PTIONS
Baldwin™-Series Classic Series Thermo-Electric Coolers have three available
options: (1) temperature display; (2) alarm relay/water slip, and (3) auxiliary analog
output. Classic Series Coolers may be equipped with any one or all of the options.
All external I/O connections for these options are available through the terminal
blocks on the bottom of the cooler.
1. Display Option
The display option is a secondary board that is mounted on the main control board.
This board has a three-digit LCD display that displays the temperature (in degrees
C) of the active channel(s). If the cooler has two active channels, there will be a
toggle switch installed to select Channel 1 or 2.
2. Alarm Relay/Water Slip Option
The alarm relay/water slip option is a secondary board that is mounted on the main
control board. This board has two inputs and three outputs per channel. The first
input, which comes from the main control board, is the ready input. The second
input, which comes from the water slip sensor, is the water slip input. The first
output, which is fed back to the main control board, controls the ready and water slip
LED(s). The second output is a 1/4 amp SPST form A dry contact relay. This relay
is used for computer sensing and is NOT intended for the controlling of electrical
loads. The third output is a 6-amp DPST form C dry contact relay. This relay can be
used for sample pump or other heavier electrical load control. This relay output
terminal is normally wired for a 120vac sample pump (ground, neutral, and line). If
there is water carry over (water slip LED), computer sense and load control relays
will be turned off. If the temperature of the cooler rises above 10
° C (50 ° F), the ready
LED, computer sense and load control relays will be turned off. This means that the
relays operate in a fail-safe manner.
Note:
If the alarm relay/water slip option is not installed, the SLIP LED(s) on the
front of the cooler will be off.
3. Auxiliary Analog Output Option
The auxiliary analog output option is a secondary board that is mounted on the main
control board. This board has one input and two outputs per channel. The input is
for a K type thermocouple. The first output is an analog voltage output that can be
configured for either 0vdc to 2.5vdc or 0vdc to 10vdc for a 0
° C (32 ° F) to 25 ° C (77 ° F)
temperature range. The second output is a 4-20 mA for the same temperature
range. The K type thermocouple is normally a 1/32-inch diameter hypodermic type
thermocouple that is installed in a special impinger so the actual sample dew point
temperature can be measured.
Note:
This option is sometimes referred to as the New Jersey thermocouple outlet
temperature option.