PATHFINDER TSC-20A User manual

Pathfinder Instruments Model TSC-20A
Conductivity Controller with Alarm
OPERATING MANUAL
General Description
The Model, TSC-20-A is a microprocessor programmable controller that accepts a conductivity electrode as an input. Outputs are;
one on-off relay;3A mechanical contacts and one Alarm relay, 2A contact. The output can be programmed to operate above or
below the set point; and the alarm is programmed as an absolute value high alarm. The power source is from100 to 240 VAC, 50/
60Hz free voltage there is no need to change connections for different voltages. The controller is programmable from the front
panel via 3 switches, and calibration is done using two front panel adjustments pots. The front panel is a 1/16 DIN, NEMA 4X rated
and mounting hardware is provided. CRU, RU&CE approvals are standard
Specifications
Measuring Scale Ranges: ………………………….10uS to 75mS
Probe Constant: ……………………………………….K= 0.01, K=0.1, K=1.0, K=1.5, K=2.3, K=10
Accuracy .......................................................± 2% of span
Output Relay .................................................S. P. D. T. Relay 3 Amp @ 115VAC, Resistive Load
Alarm Relay....................................................S. P. S. T. Relay 2 Amp @ 115VAC, Resistive Load
Power.............................................................100 to 240 VACS 50/60 Hz @ 3Watts
Operating temperature range .....................-10 to +50ºC
Storage temperature range .........................-20 to +60ºC
Display ...........................................................4 Digit red LEDs (Conductivity) 4 Digit green LED's (Set Point)
Dimensions ....................................................48 x 48 x 78.8 mm (1/16 DIN)
Memory .........................................................Non –volatile
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Installation
A. First Things
Upon receiving your order of TSC-20-A controller check to verify that the part number and quantities agree with the enclosed

packing slip. If any discrepancies exist, be sure to contact Pathfinder Instruments immediately. Inspect all controllers for damage.
Check for damaged boxes, scratches on the controller's enclosures and face plates, or any damage that may exist due to improper
handling. If such a case exists save the shipping carton and shipping material, and contact your shipping agent immediately.
B. Mounting
To flush mount your controller, first verify that the depth of your cabinet will accommodate the length of your instruments. Also
verify that where the controllers are to be mounted there are no corrosive gasses present and no vibration, impact, water, or
extreme temperature exposure. Once verified, follow the diagrams below and cut the correct sized hole from the cabinet's panel;
the panel should be between 1 and 8 millimeters thick. Insert each unit through the front of the panel. The controller's bezel should
catch and not feed through the cut out. When the controller is properly fitted in the panel, slide the plastic mounting clamp in place
and tighten the clamp screws for a firm fit.
C. Wiring Power to Controllers
AC power is to be connected to the power input terminals located on the back of your TSC-20-A refer to the wiring diagram
in the manual or on the side of the controller for the correct terminals. Your power connections should be made with 18 gauge or
larger insulated wire. A 3 amp fuse should be connected in series with power and your controller to help eliminate any problems
which could occur due to an over current situation. The TSC-20's unique power supply circuit, incorporating a free voltage
transformer accepts line voltages between 100 and 240 VAC; no need to change your wiring to accommodate voltage differences
within the rated voltage range.
Operation
A. Connect the probe
1 .Refer to the wiring diagramand connect the probe to terminals as shown, Red wire to #16, blackwire to # 17, and green wire to #
18
B. Keypad Operation
1. "SEL" key; changes upper display to the first, second and third programming menus, advances the display through the
menu and sets the programmed information into memory
2... "/\" up arrow key, increases value displayed in the green (lower) display
3... "\/" down arrow key, decreases value displayed in the green (lower) display
C. Programming
1. How to change the main control relay set point
Press and hold the "/\" up or "\/" down arrow until the correct number appears, the new set point will be active after 5 seconds.
2. How to change the Alarm relay set point
Hold the “SEL” key for approximately 2 seconds and “AL1” will appear in the upper display, the set point will be in the lower display.
Press the “SEL” switch once, the value will flash, change the value with the “up” or “down “ keys, and press the “SEL” key again to
set it in memory. Holding the “SEL” key for approximately 2 seconds will return to normal operation.
3. How to program the main control relay Hysteresis ( Deadband )
Hold the “SEL” key for approximately 3 seconds and “HYS” will appear in the upper display, the hystersis amount will appear in the
lower display, press the “SEL” key once and the amount will flash, change the amount to the desired value with the “up” or “down
“keys, press “SEL” again to set it in memory. Holding the “SEL” key for approximately 2 seconds will return to normal operation.
4. How to change the main control relay action (Relay activates above or below the set point)
Hold the “SEL” key for approximately 6 seconds and “P-n1” will appear in the upper display, the control code will appear in the lower
display, “0” or”1” will actuate below the set point, “2” or “3” will actuate above the set point. Press the “SEL” switch once, the value
will flash, change the value with the “up” or “down “ keys, and press the “SEL” key again to set it in memory. Holding the “SEL” key
for approximately 2 seconds will return to normal operation.
5. How to change the Alarm Hysteresis (deadband )
Hold the “SEL” key for approximately 6 seconds and “P-n1” will appear in the upper display, Press "\/" down arrow and “A1hy” will
appear, the hystersis amount will appear in the lower display, press the “SEL” key once and the amount will flash, change the
amount to the desired value with the “up” or “down “ keys, press “SEL” again to set it in memory. Holding the “SEL” key for
approximately 2 seconds will return to normal operation.
Calibration
A. How to calibrate
The front panel has two adjustments labeled "Zero" and "Span", always adjust the Zero first. Allow the controller to warm up for at
least 10 minutes, Place the conductivity electrode in air, wait for the reading to stabilize and adjust the “Zero “ pot for a reading of
00.00, place the electrode in a calibration solution of 10.00 uS, allow the reading to stabilize and adjust
the “Span “ pot for a reading of 10.00. Page2

1658 Ord Way, Oceanside, CA 92056
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