Myron L CTCIITD - Manual (Page 3)

ELECTRONIC CALIBRATION (CIRCUIT ONLY) -
See Section V.B.1.
a. Set Point Control Calibration
1. Ensure power is OFF.
2. Using a standard slot screwdriver remove the four (4)
screws on the clear cover and remove cover.
3. The front panel is held in place with hook & loop strips
on each side. By carefully lifting at the slot on the top,
the front panel will pull toward you. Do not pull more than
about 8 inches/20CM.
DO NOT pull on control knob(s).
4. Rotate the front panel down so that the back side is
facing you. The Circuit Board is mounted to the back of
the front panel.
5. Turn power ON.
Caution: When handling CB, DO NOT touch component side.
Electrical shock may occur.
6. Press and hold the EC switch.
7. Rotate Set Point control from “0” toward EC. At EC the
relay should click, and the LED should change from RED
to GREEN. If not, set Set Point control to EC and adjust
the CALibration control.
Models with 3 1/2 digit LCD.
The display should indicate 2.50.
If not, adjust the DISplay calibration control.
8. Turn power OFF.
9. Re-install front panel and cover as described in
“REASSEMBLY”.
10. To operate, turn power ON.
b. 0-10VDC Recorder Output Calibration
See section V.B.1.
USING STANDARD SOLUTIONS - Section V.B.2.
The BEST method of verifying and recalibrating your CTCII
Chemical Treatment Controller is with NIST traceable Standard
Solution (available from the Myron L Company). Because it
includes the sensor, the entire system is calibrated.
The following procedure describes the easiest method for
standard solution calibration. We recommended using Myron L
442-3000 Standard Solution or equivalent. This standard solution
will calibrate either Conductivity µS (at 3900 µS) or TDS ppm (at
3000 ppm).
1. Rinse thoroughly, and fill a clean glass beaker with
standard solution.
2. Place sensor in beaker of standard solution. The level of
standard solution must be high enough to cover at least
1/2” above the electrodes.
3. Slowly shake the sensor to remove air bubbles from the
electrodes.
4. Allow 5-10 minutes for temperature to equilibrate. For
the quickest and the best results, both the sensor and
solution should be at the same temperature.
5. Turn power ON.
6. Rotated the Set Point control to 3900 for Conductivity
models or 3000 for TDS models. The relay should click
and the LED will change from GREEN to RED.
If the set point is different, adjust CALibration control
on the main circuit board until the reading matches the
solution.
Models with display (standard 3 1/2 digit).
The display should match the value of the standard
solution, 3900 µS (displayed as 3.90) or 3000 ppm
(displayed as 3.00).
If the reading is different, adjust DISplay calibration
control on the main circuit board until the reading
matches the solution.
7. After adjustment, turn power OFF.
8. Re-install front panel and cover as described below in
“REASSEMBLY”.
9. To operate, turn power ON.
TRANSFER STANDARD METHOD - See Section V.B.3.
CTCII MAIN CIRCUIT BOARD
Figure V.A.1
115/230 VAC
SELECT SWITCH
100mA Slow Blow (T.10A)
115 & 230 VAC (V~)
Wickman Fuse 5 Amp
(#3741500041 or equiv)
115 VAC(V~)
SCALE SELECT
ELECTRONIC
CALIBRATION
MAIN
CALIBRATION
CONTROL
DISPLAY
CALIBRATION
CONTROL
(FACTORY SET)
OPTIONAL
LIMIT
TIMER
CONTROL
MODULE
OPTIONAL
4-20 mA
OUTPUT
MODULE
DIS
CAL
TDS COND EC
CTCII
DISPLAY
TRANSFORMER
Yel
CAP CAP
C4AM
LTM
HYST
Flow Switch
Jumper -
Remove if
flow switch
installed.
SWITCH
FUSE
RELAY RELAY
BLEED FEED
FEED
PUMP
BLEED
VALVE POWER FLOW
SWITCH SENSOR 0-10VDC
FS BK WTRD GN NU R- R+ PWR C GD PWR C GD PWR C GD
SET POINT
HYSTERESIS
RIGHT INC
LEFT DEC