Feed Water Salinometer

The salinometer is used in combination with a conductive electrode to measure

and supervise the salinity of fresh water.

Installation

Usually it is equipped with a digit LED display for displaying the salinity level

and two LED’s for alarm indication. The measuring range as well as the adjustable

alarm range is 0 – 200 ppm (salt-content). The alarm limit can be adjusted by

means of two alarm set buttons on the front panel. The actual alarm limit is

constantly displayed in a separate 3 digit LED display. If the salinity level exceeds

the alarm limit, the alarm LED’s will light up, and the relay-output will shift.

Change-over relay contact – capable of handling 4A (85-265 V AC or 24V DC)

load. Relay must be protected against overcurrent by an external 4 A slow-blow

fuse.

Full electronics test when power is switched on and during run-time a test-button is

available for testing the salinometers. The test-button will disable the electrode and

feed an internal 10 ppm signal to the salinometer (note that this will be seen as an

actual measurement, and alarms will occur). Connection to electrode is monitored

and error in this reported on the front (malfunction + LED + display = „---„).

Electrode mounting

The Electrode is to mount with the adapter piece (2) on top of the T-piece with

flanges (1) by union nut (3). The smaller union nut (5) and the clamping edge ring

(4) are to shove over the electrode from below. After adjusting the probe just a little

below the tube axis, the clamping edge ring (4) can be fastened with the nut (5).

The clamping edge union should not be used for maintenance, use the big union

nut (3) for this purpose.

During commissioning it is not necessary to carry out any adjustments on the

equipment except setting the alarm limit. When the power is turned on, the

salinometer will perform a self-test. This calibration will take approximately 5

seconds.

The electrode measures the conductivity in the water, and besides salt, also

chemicals and particles/dirt in the water can/will influence this parameter.

Especially during commissioning, and startup after long stop periods, the

measured values may be significantly higher than what is found in a chemical test

(that only reacts to salt).

The temperature-compensation embedded in the electronics in the electrode

needs time to reach water-temperature, and therefore, at startup, and in

connection with sudden changes in temperature, a deviation between measured

and actual salinity may appear shortly.

If a large difference between the Salinometer readout and a corresponding chemical

test is found, the should be checked for foreign contaminants like oil and dirt-

particles.

Maintenance

Always keep the salinometer dry and clean. The accuracy of the salinometer is very dependent on the electrodes are kept clean. The electrodes should be taken out and the tip cleaned at least once a week.

Use only a clean and soft cotton tip. Then cleaning the electrode it is important that the electrode is not polluted by oil or other chemicals. Any pollution will immediately result in an inaccurate measurement of the salinometer. If the surface of the center of the electrode is damaged, the electrode needs to be replaced. The expected longevity of the conductivity electrode is approximately 18 months.

Avoid damaging the gold plating. If the gold plating is damaged, the conductivity

electrode must be replaced.