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  3. Sanitary Conductivity/Resistivity Sensors Thornton Instruments

Mettler Toledo Sanitary Conductivity/Resistivity Sensors Thornton Instruments Operating instructions

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THORNTON
Leading Pure Water Analytics
INSTALLATION INSTRUCTIONS
SANITARY CONDUCTIVITY / RESISTIVITY SENSORS
TYPICAL
NOT
INSTALLATIONS
READ THIS FIRST
RECOMMENDED
RECOMMENDED
MOUNTING
OUTLET
INLET
84290F1
This is the ideal mounting position
This is the ideal
mounting position
The solution flow should be directed
into the end of the sensor and allowed
to pass out of the circulation holes of
the outer electrode.
The sensor should be mounted so the
cavity does not trap air or solids.
OUTLET
INLET
OUTLET
84290F3
AIR
SOLIDS
INLET
OUTLET
84290F2
Vertical mounting is possible, if the
pipe is full and air is not trapped
between the electrodes. The solution
must circulate inside the outer
electrode for accurate measurements.
INLET
OUTLET
84290F2
OUTLET
INLET
84290F4
Mount the sensor in a vertical pipe
with the flow direction up. Mettler-
Toledo Thornton does not recommend
mounting the sensor in a vertical pipe
with the flow direction down, because
air bubbles or air pockets will affect the
sensor measurement.
OUTLET
INLET
84290F5
Mettler-Toledo Thornton, Inc. Toll-Free: 800-510-PURE
36 Middlesex Turnpike Fax: 781-271-0214
Bedford, MA 01730 [email protected]
(781) 301-8600
www.thorntoninc.com OM84277 Rev. B 08/03
Cell Maintenance
Note: Contaminated cells can give inaccurate high or low readings, depending upon where the
contaminates are deposited. Both of the electrodes and the insulator surfaces must be
cleaned to ensure accurate readings.
If contamination is suspected, removed the cell from its fitting and clean the electrodes and
insulator. When cleaning, use a cotton swab saturated with a mild detergent or a very diluted
(0.5% or less) inorganic acid, i.e. HCl (Hydrochloric Acid), H
2
SO
4
(Sulfuric Acid), HNO
3
(Nitric Acid). If cleaning with acid use standard acid handling safety procedures.
Clean:
1. The inner electrode.
2. The inner surface of the outer electrode.
3. The insulator.
1
2
3
84290F6
Rinse thoroughly with distilled or deoinized water before installation. Avoid touching the
cleaned surfaces because oil from your hands will recontaminate the cell.
DO NOT USE ABRASIVE MATERIALS such as steel wool or nylon scrubbers, these
may harm the electrode surface and could affect the accuracy.
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