USER’S GUIDE
PANEL CUT-OUT DIAGRAM
M
H
DIGITAL
®
PSC-154
EXTENDED RANGE TDS/EC CONTROLLER
WITH 4-20mA OUTPUT
1. Using a knife, cut the diagram out (cut on the outer part of the line).
2. Align the cut-out to your panel and draw cut marks.
3. Cut the hole in the panel to the precise dimensions of the cut-out:
2-21/32 in. x 2-21/32 in. (67 mm x 67 mm)
--> See the installation section for complete instructions.
CONTACT DIAGRAM
2 21/32 in. (67 mm)
2
21
/32 in. (67 mm)
8 9 10 11 12 13 14
1 2 3 4 5 6 7
220V
110V
N.C. N.O.
+
-
BLUE BLACKRED WHITE
ALARM
(BUZZ)
SENSOR
POWER
RELAY (SWITCH)
4-20mA
2 7
Thank you for purchasing HM Digital’s PSC-154. The PSC-154 is a TDS/EC controller that monitors and
controls levels of Total Dissolved Solids (TDS) or Elec trical Conductivity (EC) in water. The controller has
a maximum set point to help maintain a limit of TDS/EC allowed in the water. If the TDS/EC level rises to
the set point, the controller will activate a warning light, sound an alarm (optional) and switch the dry
contact position from the normal position (to operate a valve, pump, etc.). Once the TDS/EC level drops
below the set point, this will deactivate the light and alarm and switch the contacts back to the normal
position (normally open or closed). The PSC-154 also has a 4-20mA output signal so that you can
record the TDS/EC values registered by the controller.
CONTACT INFO
BOX CONTENTS
SPECIFICATIONS
If you have any problems or questions regarding your controller, please contact HM Digital, Inc.
HM Digital, Inc. info@hmdigital.com
5819 Uplander Way www.tdsmeter.com
Culver City, CA 90230, U.S.A. 1-800-383-2777
1. Controller 3. Sensor cable (grey) 5. Mounting brackets
2. Sensor 4. Power cord (black) 6. U.S. plug adapter
EC Range: 0-9999 µS (µS/cm)
TDS Range: 0 - 4995 ppm (mg/L)
Temperature Range: 1-80
o
C; 33-176oF
Resolution: 0-999: 0.1 µS/ppm; 1000-9999: 1 µS/ppm
Accuracy: ±2% (of the reading); Thermometer: ±1
o
C, ±1.8oF
Temperature Compensation: Automatic (ATC) (1-60
o
C)
Calibration: Digital by push button (manual ne-tuning in high ranges)
Set-Point: Single point, controlled by on-screen up/down buttons (to any point within the range)
Set-Point Relay: single, isolated, 2A, Max. 220V, resistive load 100,000 strokes
Relay Control: The unit will open or close a circuit via dry contacts when the ppm/µS level reaches
or exceeds the control setting (simple switch). It can be used to control a pump, solenoid valve or
other device.
Relay Voltage: 5V (the connected device needs its own power source)
Analog Output: 4-20mA (Max load 500Ω)
Output Accuracy (mA): ±1.5%
Alarm: Optional steady beep (set by user)
Probe: ½” NPTF bushing
Cable Length: 3 meter (9.8 ft) shielded cable
Display: Bright tri-color L.E.D.
Power Supply: 110V/220V, ±10% Vac; 50/60Hz
Enclosure: Front and back with ABS
Environment: -10 to 50
o
C (4 to 122oF); RH max 95% non-condensing
Dimensions: 7.2 x 7.2 x 11.1 cm (2.8 x 2.8 x 4.4 in.)
Monitor Weight: 436 grams (15.4 oz)
THIS SPACE INTENTIONALLY LEFT BLANK
ATTACHING THE MOUNTING BRACKETS
1. Slide the controller through the hole in the panel.
2. From the rear of the controller, slide the metal square support frame over the controller, so that it is
pressed against the interior of the panel.
3. If not assembled, on the top of the controller, place one long bracket with the ridge side facing up.
Insert the short bracket into the slots on the controller, so that it ts snugly against the long bracket.
4. Slide the long bracket towards the controller face, so that the front end is pressed against the support
frame (or the panel, if not using the support frame).
5. Secure a screw from the hole in the long bracket through the hole in the short bracket. Tighten, but
do not overtighten.
6. Do the same for the bracket on the bottom of the controller. Tighten both brackets equally.
SIDE VIEW (of the top bracket)
TOP VIEW
6 3
INSTALLATION INSTRUCTIONS
USAGE INSTRUCTIONS
1. Remove the contents from the box.
2. Insert the controller into the panel. A square hole must be cut into the panel with dimensions
of 2-21/32 in. x 2-21/32 in. (67 mm x 67 mm). Page 8 includes a cut-out diagram.
3. Mount the controller to the panel by inserting the mounting brackets into the grooves on the
bottom and top of the controller. Fasten the brackets with the included screws.
4. View the contact diagram on the side of the controller (also on page 8).
5. Do NOT connect to a power source yet! Connect the black power cord to the contacts
#8 & #10 (110 V) or #8 & #9 (220V). It does not matter which color wire is connected to the
contacts. Screw in tight with a Phillips head screwdriver. (Note – If in the U.S. (or a country
that uses Type A or B plugs/sockets), connect the included plug adapter to the power cord).
6. If using a pump, valve, etc., connect a relay cord (not included) to contacts #13 and #14 for a
normally open position OR to contacts #12 and #13 for a normally closed position.
7. Connect the gray sensor cable by attaching the blue wire to contact #1, the red to #2, the
white to #3 and the black to #4.
8. Align the pins of the sensor to the cable and attach. Screw the tightening ring closed.
9. Insert the sensor electrode into a female ½” NPTF threaded tting. Attach to your water source.
10. To DISCONNECT the audible alarm, disconnect the blue wire from contacts #5 and #11.
11. To transmit the TDS data to a PLC via the 4-20mA output signal, connect a cable (not
included) from contacts #6 (positive) & 7 (negative) to a PLC or other device.
12. Plug the power cord into an electrical outlet. The controller does not have a power switch
and will automatically power on when the power is connected.
WARRANTY
ONE YEAR LIMITED WARRANTY
The PSC-154, including both the controller and sensor, is warranted by HM Digital, Inc.
("the Company") to the purchaser against defective materials and workmanship for
one (1) year from the date of purchase.
What is covered: Repair parts and labor, or replacement at the Company's option.
Transportation charges for repaired of new product to be returned to the purchaser.
What is not covered: Transportation charges for the defective product to be sent to
the Company. Any consequential damages, incidental damages, or incidental
expenses, including damages to property. This includes damages from abuse or
improper maintenance such as tampering, wear and tear, water damage, or any other
physical damage. The Company's products are not waterproof and should not be fully
submerged in water. Products with any evidence of such damage will not be repaired
or replaced. See additional note below.
How to obtain warranty performance: Attach to the product your name, address,
description of problem, phone number, and proof of date of purchase, package and
return to:
HM Digital, Inc.
ATTN: Returns
5819 Uplander Way
Culver City, CA 90230
U.S.A.
Implied Warranties: Any implied warranties, including implied warranties of
merchantability and tness for a particular purpose, are limited in duration to ve
years from date of purchase. Some states do not allow limitations on how long an
implied warranty lasts, so the above limitation may not apply to you. To the extent any
provision of this warranty is prohibited by federal and state law and cannot be
preempted, it shall not be applicable. This warranty gives you specic legal rights, and
you may also have other rights, which vary from state to state.
NOTE: Warranties are product-specic. Third-party products and products deemed by
HM Digital as "accessories" are not covered under warranty. Third-party products and
accessories include, but are not limited to, batteries, fuses, mounting brackets, plug
adaptors and ttings.
IMPORTANT: Double-check your contacts prior to connecting the controller to a
power source. Incorrect connections could result in shorting out the unit.
1. The controller will turn on when the power cord is plugged into an electrical outlet.
2. Open the cover on the front of the controller by gently pulling down.
3. To change the temperature mode, quickly press the ‘
oC/o
F’ button. This will toggle the
temperature between Fahrenheit and Celsius.
4. To change the measurement between TDS and EC, press and hold the MODE button. This will
toggle between ppm and μS.
5. To turn o the controller, unplug it from the electrical outlet.
Setting the Control Set Point
1. To set the control set point (to activate a device via the relay), press the SET button once. The
temperature reading will switch to a ashing “SET.”
2. Press the UP or DOWN buttons until the desired set point is reached. Pressing once will advance
the reading by a single digit. Holding down the button will advance the reading quickly.
3. Press the SET button again. This will save the set point to memory.
4. If the TDS/EC level reaches the saved set point, the controller will switch the contacts from the
normal position (either normally open or normally closed), thereby operating the pump,
solenoid valve, or other device attached to contacts #12 & 13 or #13 & 14.
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