Solinst 102 Operating and safety instructions

6. Unscrew the nut holding the sensitivity switch. Remove the
switch from the faceplate.
Instructions
For Mk2 Water Level Meters (Push-Release Tape Connection)
Back of Mk2 Water Level Meter Faceplate
(with new style light)
Sensitivity
Switch
Push-Release
Fittings
R4
7. Look for the resistor labeled “R4”
on the circuit board. If this resistor
is not marked “3092”, unsolder
and replace it with the one supplied
with the new sensitivity switch. You
do not need to replace the resistor
if it is already the correct one.
9. Install the new sensitivity switch through the faceplate.
Position the three connection prongs towards the battery
drawer, slightly towards the centre of the reel. Secure using
the nut.
10. Strip the ends of the wires removed from the sensitivity
switch by 3 - 4 mm, if required. Attach the wires to the
correct positions by soldering:
The black wire on the bottom left corner of the circuit
board is connected to the centre prong on the sensitivity
switch. The other black wire is connected to the prong on
the right of the sensitivity switch. The red wire connects to
the upper terminal on the top of the switch. See photos
below (some shown separate from circuit board for clarity).
8. Use the blue resistor supplied with the sensitivity switch to
create jumper wires between the connections on the new
sensitivity switch. Solder in place. See photos below.
Note: You will need to remove the new resistor from the white
plastic before installing it.
Note: Instructions for Mk1 Water Level Meters (Molex tape
connection, soldered connections to battery tray) are on Page 2.
1. Remove the battery.
2. Unscrew the small brass screw on the side of the sensitivity
knob. Remove the sensitivity knob.
3. Unscrew and remove the faceplate.
4. Press down on the white terminals of the push-release
fittings on the circuit board and pull out to remove the
tape leads.
5. Unsolder the wires at the connections to the sensitivity
switch; note the order in which they are connected.
Back of Mk2 Water Level Meter Faceplate
(with older style light)
Sensitivity
Switch
Push-Release
Fittings
R4
High Quality Groundwater and Surface Water Monitoring Instrumentation
Water Level Meter On/Off Sensitivity Switch Replacement
Model 101/102
Tools and Materials Needed
1. Sensitivity Switch and Knob Assembly (#102976), or
Sensitivity Switch (#110119)
2. Phillips Screwdriver
3. Small Flat Screwdriver
4. 10 mm (3/8") Wrench
5. Wire Cutters (if required)
6. Wire Strippers (if required)
7. Solder Wire with Flux
8. Soldering Iron
Wire Strippers (if required)

Note: To gain better access to the sensitivity switch on Mk1 Water
Level Meters, you may want to unscrew the two screws holding
the circuit board to the Sonalert, in order to move the circuit
board out of the way.
Back of Mk1 Water Level Meter Faceplate
Sensitivity
Switch
Molex
Connector
Instructions
For Mk1 Water Level Meters (Molex Tape Connection)
1. Remove the battery.
2. Unscrew the small brass screw on the side of the sensitivity
knob. Remove the sensitivity knob.
3. Unscrew and remove the faceplate.
4. Disconnect the Molex connector that connects the circuit
board to the tape.
5. Unsolder the wires at the connections to the sensitivity
switch; note the order in which they are connected.
6. Unscrew the nut holding the sensitivity switch. Remove the
switch from the faceplate.
7. Use the blue resistor to make a connection between the
centre and right prongs on the switch. Solder in place. See
photos at top right.
8. Install the new sensitivity switch through the faceplate.
Position the three connection prongs opposite the battery
tray and slightly towards the centre of the reel. Secure
using the nut.
9. Strip the ends of the wires removed from the sensitivity
switch by 3 - 4 mm, if required. Attach the wires to the
correct positions by soldering:
The two red wires on the bottom of the circuit board are
connected to the first two connections on the sensitivity
switch. The black wire on the bottom of the circuit board is
connected to the third prong on the sensitivity switch. The
black wire closest to the top of the circuit board is attached
to the prong on the top of the sensitivity switch. The other
black wire connected to the top of the sensitivity switch is
connected to the negative terminal on the battery tray. Use
the diagram and photo below for reference.
Remove
Screws for
Easier Access
Note: You do not require the resistor marked “3092” when replacing
the sensitivity switch for a Mk1 Water Level Meter.
10. Reconnect the tape to the circuit board using the Molex
connector.
11. Replace the battery and test the Water Level Meter to
ensure the connections are correct.
12. Fasten the sensitivity knob using the brass screw
13. Replace the faceplate, with three screws.
11. Reconnect the tape to the circuit board. Press down on
the white terminals on the circuit board and insert the
tape leads. Release the terminals and the leads should be
secured. The lead on the bottom of the tape (numbers
facing up, may be black mark on lead) is inserted into the
terminal with a white square below it on the circuit board.
12. Replace the battery and test the Water Level Meter to
ensure the connections are correct.
13. Fasten the sensitivity knob using the brass screw
14. Replace the faceplate, with three screws.
Printed in Canada
March 6, 2018
(#113994)
For further information contact: Solinst Canada Ltd.
Fax: [phone] Tel: [phone]
35 Todd Road, Georgetown, Ontario Canada L7G 4R8
Web Site: www.solinst.com E-mail: [email protected]
®Solinst is a registered trademark of Solinst Canada Ltd.