Rosemount Analytical 404 Operating Manual

WARNING

Before removing the sensor, be absolutely certain
that the process pressure is reduced to 0 psig and
the process temperature is lowered to a safe level!

Model 404

ENDURANCE™Conductivity Sensor

Instruction Sheet

PN 51A-404/rev.M
December 2010

If the sensor is installed in a sidestream
with the sample draining to open atmos­phere, bubbles may accumulate on the
electrodes. Trapped bubbles will cause
errors. Normally, as bubbles accumu­late the conductivity reading drifts down.
To control bubble formation, apply a small
amount of back pressure to the sensor.

SENSOR SPECIFICATIONS

SPECIFICATIONS

MODEL 404-16 (PVC body) MODEL 404-17 (stainless steel body)

Wetted Materials Titanium, PEEK (glass filled), PVC, Titanium, PEEK (glass filled),

EPDM, polyethylene 303 SST, EPDM

Temperature Range 32-140°F (0-60°C) 32-212°F (0-100°C)

Maximum Pressure 20 psig (239 kPa abs) at 60°C (140°F) 100 psig (791 kPa abs)

100 psig (791 kPa abs) at 25°C (77°F)
(use FNPT fittings only)

FIGURE 1. Installation of Model 404 Sensor

For additional information, please visit our website

at www.emersonprocess.com/raihome/liquid/.

INSTALLATION

The wetted sensor materials may not be compatible
with process com position and operating conditions.
Application compat ibility is entirely the

responsi-

bility of the user.

CAUTION

SENSOR/PROCESS

APPLICATION COMPATIBILITY

WARNING

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MODEL 404 WIRING

WIRING DIAGRAMS

FIGURE 2. Model 54eC Wiring

FIGURE 3. Model 56 and 1056 Wiring

WIRING

WIRE COLOR AND CONNECTIONS IN SENSOR

COLOR FUNCTION

Gray Connects to outer electrode

Clear Coaxial shield for gray wire

Orange Connects to inner electrode

Clear Coaxial shield for orange wire

Red

White with red stripe

White

Clear Shield for all RTD lead wires

RTD

RTD in
RTD sense
RTD return

RCV B

RCV A

RSHLD

DRVB

RTN

SENSE

RTD IN

SHLD

CLEAR

WHITE/RED

RED

DRVA

DSHLD

WHITE

CLEAR

GRAY

ORANGE

CLEAR

TB1TB2

FIGURE 4. Model 1066 Wiring

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MODEL 404 INSTALLATION

FIGURE 5. Model Xmt-C-10 Wiring (Panel)

FIGURE 6. Model Xmt-C-11 Wiring (Pipe or Wall)

FIGURE 7. Model 5081-C Wiring

FIGURE 8. Model 6081-C Wiring

WIRING THROUGH A JUNCTION BOX

If wiring connections are made through a remote junction box (PN 23550-00), wire point-to-point. Use cable 23747-00
(factory-terminated) or 9200275 (no terminations).

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MODEL 404 WIRING

CLEANING THE SENSOR

The 404-17 (stainless steel body) sensor can be taken apart for cleaning. However, in some cases, disassembling and
reassembling the sensor can cause the cell constant to change as much as 1%. For maximum accuracy, the cell con­stant should be rechecked after the sensor has been reassembled. The 400-16 (PVC body) sensor cannot be taken
apart.

Use a warm detergent solution and a soft brush or pipe cleaner to remove oil and scale. Isopropyl alcohol (rubbing alco­hol) can also be used to remove oily films. Avoid using strong mineral acids to clean conductivity sensors.

CALIBRATION

ENDURANCE conductivity sensors are calibrated at the factory and do not need calibration when first placed in service.
Simply enter the cell constant printed on the label into the analyzer.

After a period of service, the sensor may require calibration. Because Model 404 sensors have a flow-through design,
they are best calibrated against a referee meter and sensor where the two sensors are connected in series with the
same liquid flowing through both.

For more information about calibrating contacting conductivity sensors, refer to application sheet ADS 43-024, available
on the Rosemount Analytical website.

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MODEL 404 WIRING

TROUBLESHOOTING

PROBLEM PROBABLE CAUSE SOLUTION

Off-scale reading Wiring is wrong. Verify wiring.

Temperature element is open or shorted. Check temperature element for open or

short circuits. See Figure 9.

Sensor is not in process stream. Be sure sensor is completely submerged in

process stream.

Variopol cable is not properly seated. Loosen connector and reseat.

Sensor has failed. Perform isolation checks. See Figure 10.

Noisy reading Sensor is improperly installed in process Be sure sensor is completely submerged

stream. in process stream.

Variopol cable is not properly seated. Loosen connector and reseat.

Reading seems wrong (lower Bubbles trapped in sensor. Be sure sensor is properly oriented in
or higher than expected) pipe or flow cell. See Figure 1.

Apply back pressure to flow cell.

Wrong temperature correction algorithm. Check that temperature correction is

appropriate for the sample. See analyzer
manual for more information.

Wrong cell constant. Verify that the correct cell constant has

been entered in the analyzer and that the
cell constant is appropriate for the conductivity
of the sample. See analyzer manual.

Sluggish response Electrodes are fouled. Clean electrodes.

Sensor is sampling a dead area. Move sample line to a location more

representative of the process liquid.

FIGURE 9. Checking Temperature Element

Disconnect leads and measure resistance shown. The meas­ured resistance should be close to the value in the table.

FIGURE 10. Checking Continuity and Leakage

Disconnect electrode leads and measure resistance and
continuity as shown. Sensor must be dry when checking
resistance between electrode leads.

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NOTES

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NOTES

Credit Cards for U.S. Purchases Only.

The right people,
the right answers,
right now.

ON-LINE ORDERING NOW AVAILABLE ON OUR WEB SITE

http://www.raihome.com

Specifications subject to change without notice.

Emerson Process Management

2400 Barranca Parkway
Irvine, CA 92606 USA
Tel: [phone]
Fax: [phone]

http://www.raihome.com

© Rosemount Analytical Inc. 2010

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