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JENCO 3621 Operation Manual

Microcomputer based ph/orp controller
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Operation Manual
MODEL 3621
Microcomputer Based pH/ORP Controller
JENCO
ELECTRONICS, LTD.
MANUFACTURER OF PRECISION INSTRUMENTS

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Summary of Contents for JENCO 3621

  • Page 1 Operation Manual MODEL 3621 Microcomputer Based pH/ORP Controller JENCO ELECTRONICS, LTD. MANUFACTURER OF PRECISION INSTRUMENTS...

  • Page 2: Table Of Contents

    CONTENTS GENERAL INTRODUCTION)))))))))))))))..)))....2 INITIAL INSPECTION))...))))))..............2 USING THE JENCO MODEL 3621))..............3 A. Mounting procedure..................3 B. Front panel....................5 C. LCD screen....................7 D. Rear connectors...................9 E. Measure mode.....................10 F. Setting mode....................11 G. pH calibration mode...................17 H. RmV calibration mode................20 Controlling the relays................21 ERROR DISPLAY AND TROUBLESHOOTING)))))..)))......23 pH BUFFERS)))))..)))................27...

  • Page 3: General Introduction

    GENERAL INTRODUCTION Thank you for selecting the JENCO Model 3621. The 3621 pH/ORP Controller is a rugged microprocessor based instrument assembled in a watertight 1/8 DIN case, designed for use in laboratories and process control applications. The system displays pH or ORP or Temperature and relay status in one large LCD screen.

  • Page 4: Using The Jenco Model 3621

    USING THE JENCO MODEL 3621 ERVIEW Mounting Procedure Make a cutout on any panel, with a PANEL CUTOUT DIMENSIONS ± 0.61 thickness of 1/16 inch (1.5mm) to 0.00 ± 0.024 0.000 inch (9.5mm). Refer ± ± 0.813 0.032 92.0 3.622"...
  • Page 5 Replace mounting bracket Panel Mounting brackets assembly onto the controller and secure controller mounting panel. Refer DRAWING 3. DRAWING 3 Note 【 】 If the equipment is used in a manner not specified by the manufacturer, the protection provided by the equipment may be impaired.

  • Page 6: Front Panel

    B. Front Panel The front panel consists of a 4-digit LCD display and 4 keys. 3621 pH/ORP CONTROLLER MODE STAND SLOPE 7.00 ATC ENTER [ MODE ] key: 1a. In the Measure mode, this key will switch the display in sequence from pH, Temperature, ORP absolute mV, ORP relative mV and back to pH again.
  • Page 7 [ UP ] key: 2a. In the Calibration mode, pressing this key will show the next possible option. In the Setting mode, pressing this key will show the next possible option and increases the numeral increment. 2b. In the Measure mode, pressing this key and [ENTER] key at the same time, the unit will enter the Calibration mode.

  • Page 8: Lcd Screen

    the user to the next setting. C. LCD screen HI2 LOW1 LOW2 STAND SLOPE 6.86 7.00 ATC MAN Major LCD display. CAL – This icon will be displayed if the meter is in the Calibration/Setting mode. HI1 & LOW1 – These icons, when displayed, indicate relay action and relay number.
  • Page 9 HI2 & LOW2 –These icons, when displayed, indicate relay action and relay number. ℃ ℃ ℃ ℃ – Temperature and unit display. pH – Unit indicator. STAND – This icon will blink before Buffer 1 calibration. The icon will stay on while Buffer 1 is being calibrated.

  • Page 10: Rear Connectors

    Rel 1 Rel2 Connect the AC line to the rear of the instrument. The model 3621 can be used with 100~240V AC at 50/60 HZ. Make sure the EARTH connector is connected to the earth lead of the AC power line.

  • Page 11: Measure Mode

    V+ (5VDC) and V- (5VDC) output to provide excitation voltage for pH/ORP pre-amplifier only. Note 【 】 (1) Make sure that the power is unplugged before wiring your probes, relay etc. (2) Make sure you connect the AC power cord to the correct AC terminals. Connecting incorrectly may damage the unit permanently.

  • Page 12: Setting Mode

    pH – The degree of acidity or alkalinity of the solution. Temperature – Current temperature of the solution. ORP mV – A measurement of absolute ORP mV. ORP RmV– A measurement of relative ORP mV. The offset value at the RmV calibration will be added to the ORP absolute value to display the ORP relative value.
  • Page 13 +ENTER ENTER ENTER ENTER pH buffer 1 select Pressing [UP] key or [DOWN] key in this screen will cycle the display from 01 (Thermistor: 10k ohm)、02 (Resistor: PT1000)、03 (Manual) modes above. Select the preferred temperature compensation mode, press [ENTER] key to save, and enter the next setting screen.
  • Page 14 Temperature compensation select ENTER 7.00 6.86 ENTER ENTER pH buffer 2 select pH buffer 2 select: Buffer 2 6.86 Buffer 1 7.00 ENTER ENTER 7.00 6.86 6.86 7.00 ENTER ENTER ENTER ENTER Relay control parameters select Relay control parameters select...
  • Page 15 Pressing [UP] key or [DOWN] key in this screen will cycle the display from 4.01、 10.01 (or 4.00、9.18) buffer above. Select the preferred buffer, press [ENTER] key to save, and enter the next setting screen. Note : The pH buffer 2 is either 4.01 or 10.01 if select 7.00 buffer at pH buffer 1 【...
  • Page 16 Pressing [UP] key or [DOWN] key in this screen will cycle the display from pH、 ORP mV、ORP RmV modes above. Select the preferred mode, press [ENTER] key to save, and enter the next setting screen. : The relay will work with the choice of parameters. Note 【...
  • Page 17 【 】 Note : See “I. Controlling the relays ” page. Relay 1 set point value: Relay 1 HI/LOW select ENTER Pressing [UP] key or [DOWN] key in this screen to adjust the value, press [ENTER] key to save, and enter the next setting screen.

  • Page 18: Ph Calibration Mode

    Same as “Relay 1 hysteresis value” G. pH Calibration mode The model 3621 uses 2-point calibration for pH. The first point must be 6.86/7.00, and the second point can either be 4.00/4.01 or 9.18/ 10.01. In the pH Measure mode, pressing [UP] key and [ENTER] key at the same time to...
  • Page 19 Buffer 1 (STAND) calibration: ENTER +ENTER STAND SLOPE 7.00 STAND 7.00 STAND 7.00 Buffer 2 calibration Enter into the pH calibration mode, the “STAND” icon will flash, the unit is ready to be standardized at the first buffer. Rinse the pH and ATC/Temp probes in distilled water and immerse them in the first buffer solution (either 7.00 or 6.86).
  • Page 20 Buffer 2 (SLOPE) calibration: Buffer 1 calibration ENTER Measure mode 7.00 STAND SLOPE 7.00 STAND SLOPE Rinse the pH and ATC/Temp probe in distilled water and immerse them in the second buffer solution (either 4.00/4.01 or 9.18/10.01). Allow temperature reading to stabilize, then press “ENTER”...

  • Page 21: Rmv Calibration Mode

    H. RmV Calibration mode +ENTER RmV normal mode The model 3621 uses 1-point calibration for RmV. In the RmV Measure mode, pressing [UP] key and [ENTER] key at the same time, the meter will enter into RmV calibration mode. Rinse the ORP probe in distilled water and immerse it in the ORP standard solution, then press [UP] or [DOWN] key to adjust the ORP value to that the ORP standard.

  • Page 22: Controlling The Relays

    【 】 Note : When the ORP absolute mV reading is off, recalibrate RmV value. Controlling the relays Isolation voltage: The maximum isolation voltage of the relay output contacts is 1500 VDC. The voltage differential between the relay output contacts and the load should not exceed 1500 VDC.
  • Page 23 If the relay action is set to HIGH, the relay will turn ON at (Set Point +1/2 Hysteresis ), and will turn OFF at (Set Point -1/2 Hysteresis ). If the relay action is set to LOW, the relay will turn ON at (Set Point -1/2 Hysteresis ), and will turn OFF at (Set Point +1/2 Hysteresis ).

  • Page 24: Error Display And Troubleshooting

    ERROR DISPLAY AND TROUBLESHOOTING ERVIEW pH/ORP Temperature Possible cause(s) Display Mode Display Display [Action(s)] "OvEr" -10.0~120.0 pH measure mode pH > 16.00pH °C [Recalibrate] “Undr” -10.0~120.0 pH measure mode pH < -2.00pH °C [Recalibrate] "OvEr" "OvEr" pH measure mode a. Temperature > 120.0°C. [Bring buffer solution to lower temperature.] [Replace temperature probe.]...
  • Page 25 "OvEr" “Undr” pH measure mode a. Temperature < -10.0°C. [Bring buffer solution to higher temperature.] [Replace temperature probe.] b. No temperature sensor. [Adjust the manual temperature to -10~120°C.] "OvEr" Temperature Absolute ORP mV Absolute ORP mV > +1999 mV reading or relative ORP [Bring solution to a lower ORP reading]...
  • Page 26 "OvEr" Absolute ORP mV a. Temperature > 120.0°C. reading or relative ORP [Bring buffer solution to lower temperature.] [Replace temperature probe.] b. No temperature sensor. [Adjust the manual temperature to -10~120°C.] "Uder" Absolute ORP mV a. Temperature < -10.0°C. reading or relative ORP [Bring buffer solution to higher temperature.]...
  • Page 27 "OvEr" 0~60°C a. pH calibration a. Offset < -100 or > 100 mV mode-Buffer (STAND)-7.00 b. pH calibration b. Offset < -91.7 or > 108.3 mV mode-Buffer (STAND)-6.86 c. pH calibration c. Slope > ideal mV by 30% mode-Buffer (SLOPE) [Use a new buffer solution.] [Replace electrode.]...

  • Page 28: Ph Buffers

    pH BUFFERS The temperature characteristics of pH calibration buffers pH4.00, pH4.01, pH6.86, pH7.00, pH9.18 & pH10.01 are stored inside the instrument. The buffers used to calibrate the instrument must exhibit the same temperature characteristics as the stored values. °C 4.00 6.86 9.18 4.01...

  • Page 29: Specifications

    4.03 6.84 9.07 4.03 6.97 9.89 4.04 6.83 9.04 4.04 6.97 9.86 4.06 6.83 9.02 4.06 6.97 9.83 4.07 6.83 8.99 4.08 6.97 9.80 4.09 6.84 8.97 4.10 6.98 9.78 : The actual reading of the instrument can differ from the values shown by Note 【...
  • Page 30 Recognized pH buffers US (4.01, 7.00, 10.01) or NIST (4.00, 6.86, 9.18) pH Temperature compensation Manual/Auto -10.0°C to 120.0 °C pH Buffer Temperature range 0.0°C to 60.0 °C pH Electrode Offset recognition ±100 mV at pH 7.00  +108.3 mV/-91.7 mV at pH 6.86 pH Electrode Slope recognition ±30% at pH 4.00, 4.01, 9.18, 10.01 ...

  • Page 31: Warranty

    If you purchased the item from our Jenco distributors and it is under warranty, please contact them to notify us of the situation. Jenco Service Department alone will determine if the product problem is due to deviations or customer misuse.
  • Page 32 For your protection, items must be carefully packed to prevent damage in shipment and insured against possible damage or loss. Jenco will not be responsible for damage resulting from careless or insufficient packing. A fee will be charged on all authorized returns.
  • Page 33 Website: www.jencoi.com Jenco Electronics Inc. 1F., NO. 11, Lane 370, Sec. 6, Zhongxiao E. Rd. Nangang Dist., Taipei, Taiwan TEL: 886-2-2782-3226 FAX: 886-2-2782-3234 Shanghai Jenco Instruments, Ltd. 18 Wang Dong Zhong Road Sijing Town, Songjiang Shanghai, China TEL: 86-021-5761-9599 FAX: 86-021-5761-9598 E-Mail: jencos@jenco.com.cn...

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