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Instruction Sheet
PN 51A-228/rev.P
December 2010
Model 228
Submersion/Insertion Toroidal Sensor
For additional information, please visit our website
at www.emersonprocess.com/raihome/liquid/.
CAUTION CAUTION
WARNING
SENSOR/PROCESS
APPLICATION COMPATIBILITY
Before removing the sensor, be absolutely certain
that the process pressure is reduced to 0 psig and
The wetted sensor materials may not be compatible
the process temperature is lowered to a safe level!
with process com position and operating
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MODEL 228 INSTALLATION FIGURE 1. Adapter PN 23242-02 FIGURE 2. Adapter PN 23242-03 FIGURE 3. Adapter PN 2001990 use with 228-21 (3/4 in. MNPT) use with 228-20 (5/8-11 UNC threads) use with 228-21 (3/4 in. MNPT) INSTALLATION Keep at least 1 in. (2.5 cm) between the sensor and pipe walls. If the clearance is too small, calibrate the sensor in place. Ensure that the sensor is completely submerged in liquid. Mounting the sensor in a vertical pipe run with the flow from bottom to top is best. If the
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MODEL 228 WIRING FIGURE 5. Wiring 228-54 and 228-56 sensors to Model 1056 and 56 analyzers FIGURE 6. Wiring 228-54 and 228-56 sensors to Model 54eC analyzer 3
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MODEL 228 WIRING FIGURE 7. Wiring 228-54 and 228-56 sensors to Model Xmt-T panel mount transmitter FIGURE 8. Wiring 228-54 and 228-56 sensors to Model Xmt-T pipe/wall mount transmitter 4
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MODEL 228 WIRING TB2 TB1 TB2 TB1 RTN RCV B RTN RCV B SENSE RCV A SENSE RCV A RTD IN RSHLD RTD IN RSHLD SHLD DRV B SHLD DRV B DRV A DRV A DSHLD DSHLD CLEAR CLEAR SHIELD IS NOT CONNECTED. IT IS PRESENT IN HIGH TEMPERATURE (OPTION-03) ONLY 228-56 228-54 FIGURE 9. Wiring 228-54 and 228-56 sensors to Model 1066 transmitter FIGURE 10. Wiring 228-54 and 228-56 sensors to Model 5081-T transmitter 5 GREEN WHITE CLEAR BLACK GREEN BLACK WHITE CLEAR GREEN WHITE BLACK BLACK GREEN CLEAR BLACK WHIT
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MODEL 228 WIRING WIRING THROUGH A REMOTE JUNCTION BOX FIGURE11. Wiring sensors through a remote junction box Wire sensors point to point. For wiring at the analyzer end, refer to the appropriate analyzer wiring diagram. For interconnecting cable 23294-00, use the 2265-54 wiring diagram. For interconnecting cable 23294-04 and 23294-05, use the 226-56 wiring diagram. FIGURE 12. Remote Junction Box (PN 23550-00) 6
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MODEL 228 USE OF INSERTION - RETRACTION ASSEMBLIES INSERTION - RETRACTION ASSEMBLIES INSTALLATION REQUIREMENTS 1. Process connection: 1-1/2 inch. Larger openings 4. Retraction clearance: 2 ft (0.6 m). may keep the sensor from inserting far enough 5. Provide mechanical support if excess vibration is into the process liquid. expected. 2. Line size: 3 in.; 2-in. line requires in-place calibra- 6. Flush water: provide 1/8 in. valves in inlet and tion. outlet flush ports. Position flush ports so that
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MODEL 228 USE OF INSERTION - RETRACTION ASSEMBLIES RETRACTION MILLIMETER INCH 1. Make certain that the system pressure is less than 35 psig (342 kPa abs). Push in on the sensor using the top of the junction box. Slowly loosen the collet nut. WARNING Severe impact injury can occur if the collet nut is loosened under pressure. 2. When the collet nut is loose enough, slowly ease the sensor back so that it clears the ball valve. Close the valve to the process line. 3. Drain the retraction chamber co
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MODEL 228 USE OF INSERTION - RETRACTION ASSEMBLIES MECHANICAL RETRACTION ASSEMBLY (PN 23311-00) INSTALLATION 1. Thread the sensor cable through the tube into the MILLIMETER INCH junction box. Screw the sensor into the tube. Hand tighten the sensor an additional half turn once the gas- ket is seated. See Figure 15. 2. Terminate the sensor wiring in the junction box. See Figure 13 for wiring details. 3. Using a 1/2 in. (13 mm) socket wrench, retract the sensor into the retraction chamber. 4. Ins
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MODEL 228 USE OF INSERTION - RETRACTION ASSEMBLIES REPLACING SEALS IN MANUAL AND MECHANICAL RETRACTION ASSEMBLIES. 1. Retract the sensor into the retraction chamber and 13. Replace all damaged parts with replacement parts fully close the ball valve. from Figure 16 or 17. Replace the sensor tube if the surface is damaged. A rough or uneven surface 2. Drain the retraction chamber contents using the will prevent the Teflon cup from sealing. 1/8 in. flush ports. 14. Rebuild the bushing housing. The
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MODEL 228 USE OF INSERTION - RETRACTION ASSEMBLIES FIGURE 16. Mechanical Retraction Assembly Replacement Parts 11
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MODEL 228 USE OF INSERTION - RETRACTION ASSEMBLIES FIGURE 17. Manual Retraction Assembly Replacement Parts 12
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MODEL 228 CALIBRATION CALIBRATION The nominal cell constant of the Model 228 sensor is 2.7/cm. The error in the cell constant is about ±10%, so con- ductivity readings made using the nominal cell constant will have an error of at least ±10%. Wall effects, discussed below, will likely make the error greater. For higher accuracy, the sensor must be calibrated. Wall effects arise from the interaction between the current induced in the sample by the sensor and nearby pipe or vessel walls. As Figure
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MODEL 228 MAINTENANCE MAINTENANCE CAUTION WARNING Be sure sensor has been cleaned of process liquid Retraction chamber contents may be under pressure. before handling. Generally, the only maintenance required is to keep the opening of the sensor clear of deposits. Cleaning frequency is best determined by experience. TROUBLESHOOTING PROBLEM PROBABLE CAUSE SOLUTION Off-scale reading Wiring is wrong. Verify and correct wiring. RTD is open or shorted. Check the RTD for open or short circuits. See F
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FIGURE 19. Resistance check. Disconnect leads from analyzer before measuring resistances. TABLE 1. Temperature Resistance 10 C 103.9 Ω ° 20 C 107.8 Ω ° 25 C 109.7 Ω ° 30 C 111.7 Ω ° 40 C 115.5 Ω ° 50 C 119.4 Ω ° 15
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