Instruction Manual
IM-106-910C, Rev. 1.0
November 2009
2-21
Hazardous Area
X-STREAM O
2
Transmitter
Direct Replacement (DR)
Probe Connections
A direct replacement probe is available for connection to an existing
electronics package. Use the following procedure to connect a DR probe to
the transmitter electronics.
1. Remove covers from probe.
2. Feed all DR probe wiring through line power conduit of probe. Add new
lead wire junction box and conduits as needed.
3. Connect DR probe heater power leads to DR probe connector,
Figure 2-19.
4. Connect O
2
signal and thermocouple wires to DR probe connector.
DR Probe to Yokogawa
Electronics Connections
The DR probe can be wired to work with Yokogawa electronics. Connect the
cabling from the Yokogawa electronics terminal to the probe terminal as
shown in Figure 2-20. Review the following information. If needed, replace the
CJC board mounted inside the RD probe.
Yokogawa used two types of CJC devices in their probes. The older style
used a transistor type device and the newer version used a resistance
thermocouple device (RTD). Each device performs differently in providing a
temperature feedback signal and cannot be interchanged.
The DR probe is provided with two Cold Junction Compensation (CJC)
boards for use with Yokogawa electronics. The type of Yokogawa electronics
used will dictate which CJC board should be installed in the DR probe.
NOTE
These instructions are not all inclusive of the possible Yokogawa electronics
currently in use. Other electronics or CJC devices may exist. Refer to the
following instructions as an aid in selecting the proper CJC board.
Transistor Type CJC Board (P/N 3D39505G01)
Identification:
Metal can or potted device at Q1
YEW Probes:
Z021D (Suffix varies)
Yew Electronics:
Z8A Averager
AV8C Averager
AV550 Averager
(properly programmed)
Misapplication:
Electronics will read near 25
°
C at ambient,
but the reading will slowly decrease as the
temperature rises.
RTD Type CJC Board (P/N 3D39505G02)
Identification:
2-lead resistive (RTD) device at Q1
(bent over and bonded to board)
YEW Probes:
ZR22 (Suffix varies)
YEW Electronics:
AV550 Averager (properly programmed)
ZR402 Analyzer
Misapplication:
Electronics will read near 200
°
C at ambient.
