Section 6 - Reference Probe; Internal Reference Probe Connections - Omega BB702 User Manual

Section 6 - Reference Probe

An electrically isolated 100Ω Class A RTD probe has been embedded into the
target plate heater assembly to be used as a reference. This feature is commonly
used in conjunction with a precision thermometer, ohmmeter or temperature
recording device. The maximum current being passed through the RTD should
never exceed 0.3 mA (constant DC). A connector has been provided with your
calibrator for connection to this reference probe. Notice that at each temperature,
a given resistance will be measured at the reference port. The resistance is
measured across PIN1-PIN2 or across PIN1-PIN3. PIN2 and PIN3 are connected
to the same side of the RTD.
BB702 Reference Probe
TARGET PLATE ASSEMBLY
RTD REFERENCE PROBE
Figure 9. Internal Reference Probe Connections
BLACK WIRE
RED WIRE
1
3
2
BLACK WIRE
6
REFERENCE
PROBE
CONNECTOR
6-1