274
TECMount
User’s Manual · Page 5
Connector Pin-Outs
DB-15 Pin
Description
1, 2 & 9
TE (+)
3, 4 & 10
TE (–)
7 & 14
Thermistor or RTD /
8 & 15
Thermistor or RTD / Sensor–
11, 12 & 13
FAN (+)
DB-15 Connector Pin-Out
Phoenix Pin
Description
1
EXT (+)
2
EXT (–)
Phoenix 2-Pin Connector Pin-Out
Sensor Polarity and 4-Wire Connections
While the thermistor and RTD inputs are not polarized, when using a 4-wire RTD
connection from the mount, it is important to properly connect the polarity of the
sense wires to the sensor. Pins 7 and 14 should be one polarity (+) and pins 8
and 15 should be the opposite polarity (–). If polarities are not matched, the
instrument will indicate a sensor error.
EXT Input and SENSOR Switch
The
274
features a SENSOR switch to quickly switch between internal and
external temperature sensors. With the SENSOR switch in the INT position, the
internal thermistor embedded in the cold plate is used to provide the feedback
for the temperature controller. With the SENSOR switch in the EXT position, the
EXT+ and EXT- inputs on the Phoenix connector are connected to pins 7 & 14
) and 8 & 15 (Sensor–).
The 274 comes with one Phoenix 2-pin plug. Additional plugs can be ordered
online at
www.mouser.com
or
www.digikey.com
, Phoenix part number 1803578.
