Tech Note: Unreleased
Date: October 22, 2013
Standard ZR22G Heater and Cell Replacement
Necessary Parts to Order
ZR22A-###-A-A (Heater strut assembly with tool (M1234HD-A) provided)
B1011ER (O-Ring for piping connector)
B1013ER (O-Ring for piping connector to reference gas cap)
B1013ER (O-Ring for piping connector to calibration gas cap)
B1014ER (O-Ring for reference gas cap)
B1014ER (O-Ring for calibration gas cap)
E7042UD (If replacing the zirconia cell as well; otherwise only the K9470BJ metal
o-ring, the E7042BS contacting spring, and E7042AY filter screen are needed)
High-temperature grease
Tools Needed
#2 Philips-head screwdriver
Pick set or tweezers (having both is optimal)
8mm socket
Torque wrench
10mm combination wrench or an appropriately sized crescent wrench
Allen wrench
4.5mm pin spanner (if using the type one oil and gas dust filter)
Verify the heater is off and has sufficient time to cool before attempting this
procedure. Use Appendices A and B as a reference for this guide.
Zirconia Cell Removal
Remove (1) by twisting it counter-clockwise if you have type the type one filter; if
you have type two keep reading.
Remove the four bolts (2) and washers (3) on the heated end of the probe by
turning them counter-clockwise with an 8mm socket wrench. Remove the
contactor plate (4), calibration j-tube (5) and filter screen (6) from the tip of the
probe. Remove the zirconia cell (6) by twisting it clockwise while simultaneously
gently pulling it away from the tip of the probe. The metal o-ring (7) should fall
out with the cell removed. You should not re-use this o-ring, otherwise the cell