Erminal, Lock, Escription – Perma Pure Baldwin-Series M225 User Manual
Page 11
Section G: I/O Terminal Block Description
11
G:
I/O
T
ERMINAL
B
LOCK
D
ESCRIPTION
The I/O terminal blocks are found on the bottom panel of the cooler:
TB1
TB1 is the standard analog output (low voltage DC output) for all Classic
Series Thermo-Electric Coolers. Model M225 has two active 5” heat exchangers.
The output is 0vdc to 2.5vdc for a temperature range of 0
°
C to 25
°
C.
C
Terminal 1 is earth ground. This terminal should be used to ground the shield of the
shielded twisted pair cable that is used to connect the analog output to a receiving
instrument.
C
Terminal 2 is the signal return.
C
Terminal 3 is the channel 1 output.
C
Terminal 4 is the channel 2 output.
TB2
TB2 is the I/O terminal block (low level DC voltage or current or no voltage
contact) used for all installed options, such as the alarm relay/water slip option or
auxiliary analog output option.
C
Terminal 1 is earth ground. This terminal should be used to ground the shield of the
shielded twisted pair cable that is used to connect the analog output board of the
auxiliary analog output to a receiving instrument.
C
Terminal 2 is the signal return for the auxiliary analog voltage output.
C
Terminal 3 is the auxiliary analog voltage output.
C
Terminal 4 is the negative side of the auxiliary analog 4-20mA output.
C
Terminal 5 is the positive side of the auxiliary analog 4-20mA output.
C
Terminals 6 & 7 are the dry contact form A relay output used for computer sense for
the alarm relay/water slip option.
C
Terminals 8 & 9 are the water slip sensor input for the alarm relay / water slip
(moisture carryover) option.
C
Terminal 10 is earth ground. This terminal should be used to ground the shield of the
twisted pair cable that is used to connect the water slip sensor to terminals 8 & 9.
TB3
TB3 is the switched AC terminal block (line AC voltage output) used for
sample pump control when the alarm relay/water slip option is installed.
C
Terminal 1 is the AC LINE voltage.
C
Terminal 2 is the AC NEUTRAL.
C
Terminal 3 is the EARTH GROUND.
TB4
Note: The description for TB4 is the same as for TB2. TB4 is used for
Channel 2's I/O.
TB5
Note: The description for TB5 is the same as for TB3. TB5 is used for
Channel 2's switched AC.