PASI WMS-LTC User manual

WMS
-
LTC
User Manual
Temperature Level Conductivity meter
P.A.S.I srl – via Galliari 5/E – 10125 TORINO – Italy
Tel. [phone] – Fax [phone] - E-mail [email protected]t
www.pasisrl.it

Table of Contents
Table of Contents .............................................................................................................. 1
1. Important Notice ....................................................................................................... 2
2. Warranty and safety instructions .............................................................................. 3
3. Introduction ............................................................................................................... 4
4. Technical Specifications ........................................................................................... 5
Probe ............................................................................................................................. 5
Temperature .................................................................................................................. 6
Conductivity .................................................................................................................. 6
Level Indicator .............................................................................................................. 6
Power supply ................................................................................................................. 6
Display .......................................................................................................................... 7
User Interface ................................................................................................................ 7
5. User Interface, functionality and maintenance ......................................................... 8
Panel .............................................................................................................................. 8
Functionality ................................................................................................................. 9
ON ............................................................................................................................. 9
OFF ........................................................................................................................... 9
Back-lighting ............................................................................................................ 9
Changing the unit of measure of the temperature ................................................... 10
Display of the remaining battery charge - percentage ............................................ 10
Sensitivity selection for level detection .................................................................. 10
Calibration .............................................................................................................. 11
Maintenance ................................................................................................................ 11
6. Take a measurement ............................................................................................... 13

2
1. Important Notice
All rights to this manual are owned solely by P.A.S.I. srl. All rights reserved.
P.A.S.I. software and programs are delivered "as is".
P.A.S.I. products have not been designed to be used in any way or application other than
those mentioned.
This guide refers to "WMS-TLC".
Torino, ITALIA 2020
Copyright: 2020 P.A.S.I. srl

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-
LTC
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Warranty and safety instructions
2. Warranty and safety instructions
Read the instructions carefully before using the product:
- Warranty will be void if the product is used in any ways that is in contradiction with
the instructions given in this manual.
- Warranty will be void if the instrument has been tampered with.
- The device must be used only according to the instructions described in this manual.
Faultless and safe operation of the device can be guaranteed only if the transport,
storage, handling and operation of the device is appropriate.
- To avoid damage, use only original accessories or approved by PASI srl.
- When a suitable location has been selected for the instrument, you must ensure that
water does not flow into the device under any conditions. Only the probe and the
cable are guaranteed in case of immersion. Direct sunlight is also to be avoided for
long periods. It is not recommended to install the device on a highly vibrating surface.

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3. Introduction
The instrument WMS-LTC is a device designed and assembled by PASI srl.
The WMS-LTC is a conductivity, temperature and level meter.
The instrument is equipped with a display on which the temperature and conductivity
indications are shown.
The water level will be visible on the cable marked in centimetres.
The instrument is also equipped with a sound signal and LED that indicate the water
level – placed on the panel
The system consists of:
 Winch with cable of the selected length equipped with probe for measuring
conductivity, temperature and level.
 Batteries included.

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-
LTC
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Technical Specifications
4. Technical Specifications
Cable marked in centimetres
rounded cable, four copper wires, kevlar core and external antiscratch protective film in
transparent PUR.
Graduation in centimeters, printed in black on the cable itself, with meter-decimeter
indication
Probe
Probe diameter 20mm
Probe length 200mm
Materials Stainless steel body, plastic protective
cap/cover

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Temperature
Unit of measure °C o °F
Measuring range from -10°C to +60°C or from 14°F to 140°F
Precision +/- 0.2°C or +/- 0.4°F
Conductivity
Unit of measure µS/cm or mS/cm normalized at @25°C
Range from 40µS/cm to 80000µS/cm
Precision +/- 5% of the reading
Level Indicator
Sensitivity 4 sensitivity levels, automatic or manual selection.
Signaling Sound signal and red LED indicate when the probe enters
and exits the water
Power supply
Batteries 4 X 1,5V AA alkaline batteries
Battery life 70h (depends on the use)
Auto Off After 60min

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-
LTC
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Technical Specifications
Display
Backlight Yes
Line 1 Conductivity
Line 2 Temperature
User Interface
Push-button Single button for on / off and settings
NOTICE:
When the batteries are flat, the instrument will automatically switch off and display
a low battery message accompanied by a warning light and sound signal

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5. User Interface, functionality and
maintenance
Panel
The panel on the instrument shows information about the instrument and its functions.
The 2 lines on the display show respectively:
 Conductivity level normalized to 25°C;
 Temperature.
Conductivity is displayed in:
 µS/cm when, next to the reported value, only the unit of measure µS occurs;
 mS/cm when, next to the reported value, only the unit of measure mS occurs.

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LTC
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User Interface, functionality and maintenance
The instrument automatically switches from µS to mS and vice versa, based on the
conductivity it measures.
The temperature value is shown in ° C (Default) and ° F. Once the unit of measurement
has been changed, the instrument keeps track of the choice made and will keep it until
further modification, even after switching the device off and on again. When you reset
the instrument, the unit of measurement returns to the Default one, ie ° C.
Functionality
The interface consists of a single button for all functions. The instrument detects the
number of presses or the time of pressing to perform specific functions:
 ON;
 OFF;
 Back-lighting;
 Change the unit of measure of the temperature;
 Display of the remaining battery charge - percentage;
 Sensitivity selection for level detection;
 Reset to factory settings;
 Calibration.
ON
When the instrument is switched off, short press the “ON/OFF” button.
OFF
Press and hold the “ON/OFF” button, until the sound signal and light are activated.
Back-lighting
The backlight is activated with a single short press of the "SETTING" button. It will
remain active for about a minute and a half.

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Changing the unit of measure of the temperature
To change from °C to °F and vice versa, two short presses of the "SETTING" button.
Display of the remaining battery charge - percentage
To view the remaining battery charge, you must press for three times the "SETTING"
button. The estimated remaining percentage of the batteries will be displayed. The display
of conductivity and temperature will be restored after 4 seconds, no the need to press the
"SETTING" button.
Sensitivity selection for level detection
The detection of the water level may be inaccurate due to the formation of water residues
on the probe after extracting it from the water. For this reason the WMS-LTC is equipped
with an automatic level detection system. When there is high conductivities, however,
manual selection of sensitivity may be more effective. The instrument has 4 thresholds:
 Ultra low, used for pure water;
 Low;
 Medium;
 High, for high conductivity.
You can switch from one sensitivity level to another with four short presses of the
"SETTING" button. The display will show the chosen level for two seconds.
The transition from one threshold to another occurs in the following order:
Ultra Low => Low => Medium => High
The selection goes round in a loop so after "High" you switch back to "Ultra Low" and
so on. If it is selected a lower threshold than that detected by the instrument, the
transition to the highest threshold will take place automatically.
Reset to factory settings
The reset to factory settings is useful in cases where a calibration has failed or before
carrying out a new calibration.
To reset the instrument, carry out six consecutive short presses of the "SETTING" button.

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LTC
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User Interface, functionality and maintenance
At this point a confirmation request will appear on the display. By pressing the
"SETTING" button again, you are confirming instrument reset. Waiting without pressing
for 10 seconds cancels the reset and the instrument will resume normal operation.
Calibration
To access the calibration functions, press and hold the "SETTING" button. The
instrument will switch off but you must continue to keep the button pressed until it
switches on again. At this point the calibration procedure will start.
This procedure involves calibration on 3 points respectively at:
 1413µS/cm
 5000 µS/cm
 12880 µS/cm
For calibration it is recommended to use only certified solutions.
Before carrying out a new calibration please make sure that the probe is clean. We suggest
using denatured ethyl alcohol, see “Maintenance” paragraph.
Before and between each measurements it is important that the probe is thoroughly rinsed
in distilled water to prevent residues from polluting the next solution.
For each measuring point, the instrument will indicate the measuring point it expects to
measure. Press the "SETTING" button to begin reading and "READING" will appear on
the second line
A sound signal notifies the end of the reading and the request to move on to the next
solution.
At the end of the calibration procedure the instrument will resume normal operation.
Maintenance
To keep your instrument in perfect condition, remember to carefully clean the cable and
sensor and dry them with a soft cloth after use.
NOTICE:
Since the probe takes a few minutes to accurately read the temperature, it is very
important that, before starting a calibration procedure, the probe and solutions are all
at room temperature.

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To clean the probe it is recommended to use denatured ethyl alcohol and then rinse it in
distilled water. This procedure is very important to get an accurate reading.

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-
LTC
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Take a measurement
6. Take a measurement
The use of the WMS-LTC instrument is very easy.
After switching on the instrument, the conductivity, temperature and level can be read.
The probe has a certain thermal inertia and to obtain an accurate reading of conductivity
and temperature it is necessary to leave the probe immersed for at least 5 minutes.
For an accurate reading of the level, conductivity and temperature, it is recommended to
proceed as follows:
 Unwind the cable until the level is reached;
 Wind the cable slowly by pulling the probe out of the water, wait for the sound
signal and for the LED to go off – these signals mean “exit from the water”;
 Lower the probe very slowly again until the water level is reached.
 Read the depth measurement on the cable.
 Leave the probe immersed for more than 5 minutes to achieve thermal
equilibrium.
 Read conductivity and temperature on the display.