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B&C PH 7685 Operator's Manual

Ph/orp controller microprocessor based
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U N I E N I S O 9 0 0 1 : 2 0 0 0
C E R T . N . 9 1 1 5 B C E L
OPERATOR'S MANUAL
PH 7685
pH/ORP CONTROLLER
MICROPROCESSOR BASED
Rev. B
Valid from S/N 54470
Valid for Options 091.3711 and 091.211
pH range: 0/14.00 pH
ORP range: -1000/+1000 mV
Temperature range: -11/+110 °C
Power supply: 110/220 Vac
Software: R2.1x
B&C Electronics Srl – Via per Villanova 3 – 20040 Carnate (Mi) – Italy
P.IVA 00729030965
Tel +39 039 63 1721 – Fax +39 039 607 6099
bc@bc-electronics.it - www.bc-electronics.it

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Summary of Contents for B&C PH 7685

  • Page 1 U N I E N I S O 9 0 0 1 : 2 0 0 0 C E R T . N . 9 1 1 5 B C E L OPERATOR'S MANUAL PH 7685 pH/ORP CONTROLLER MICROPROCESSOR BASED Rev.

  • Page 2: Table Of Contents

    B&C Electronics PH 7685/E – Rev. B FEATURES ..........................3 SPECIFICATIONS........................4 FUNCTIONAL SPECIFICATIONS ................... 4 TECHNICAL SPECIFICATIONS..................6 PHISICAL SPECIFICATIONS ..................11 INSTALLATION ........................12 PHYSICAL INSTALLATION..................12 ELECTRICAL INSTALLATION..................12 OPERATING THE SYSTEM ....................15 SOFTWARE DESCRIPTION ....................16 KEYBOARD ........................

  • Page 3: Features

    B&C Electronics PH 7685/E – Rev. B FEATURES * Input from pH electrode (Glass or Antimony) - ORP electrode * Input from Pt100 3 wires * Alphanumeric back-lighted LCD * Temperature readout * Operating mode: automatic and manual * Calibration parameters display...

  • Page 4: Specifications

    B&C Electronics PH 7685/E – Rev. B SPECIFICATIONS 2.1 FUNCTIONAL SPECIFICATIONS Input The instrument accepts input from a glass or Antimony pH electrode or ORP electrode. A second input is provided for 3 wires Pt100 Temperature sensors. Microtrasmitter input The instrument is provided with an input for amplified probes with 080102 microtransmitter.
  • Page 5 B&C Electronics PH 7685/E – Rev. B Operating mode The instrument is provided with 2 programmable modes of operation. Automatic operation: The Automatic mode is the normal operation mode of the unit. Manual operation: This mode of operation would normally be used for control system troubleshooting.

  • Page 6: Technical Specifications

    B&C Electronics PH 7685/E – Rev. B 2.2 TECHNICAL SPECIFICATIONS The Default values are correspondent to the factory calibration values. Parameters marked by " * " can be modified in the Configuration procedures. OPERATING MODE Default Automatic/Manual Auto SENSOR TYPE...
  • Page 7 B&C Electronics PH 7685/E – Rev. B SET-POINT A Default * Control functions: On/Off On/Off PFM - Pulse frequency modulation (option 091.211) PWM - Pulse width modulation (option 091.211) * Function: On/Off Set-point (pH): 0.00/14.00 pH 0.00 pH (Rx): -1000/1000 mV 0 mV Hysteresis (pH): 0.00/1.50 pH...
  • Page 8 B&C Electronics PH 7685/E – Rev. B SET-POINT B Default * Control functions: On/Off On/Off PFM - Pulse frequency modulation (option 091.211) PWM - Pulse width modulation (option 091.211) * Function: On/Off Set-point (Rx): -1000/1000 mV 0 mV (pH): 0.00/14.00 pH 0.00 pH...
  • Page 9 B&C Electronics PH 7685/E – Rev. B ANALOG OUTPUT Nr. 1 Default * Input: pH/mV/°C (option 091.3711) * Range: 0-20/4-20 mA 0-20 mA * Point 1 (corresponding minimum mAmps): pH: 0.00/14.00 pH 0.00 pH Rx: -1000/1000 mV -1000mV °C: -10.0/110.0°C (option 091.3711) -10.0°C...
  • Page 10 B&C Electronics PH 7685/E – Rev. B CONFIGURATION Default Parameters indicated by asterisks " * ", may be selected in the Configuration menu. Free calibration (access code not required): Keyboard locked/unlocked: Unlocked LCD contrast: (0/7) Under access code number (0):...

  • Page 11: Phisical Specifications

    B&C Electronics PH 7685/E – Rev. B PHISICAL SPECIFICATIONS The controller enclosure is designed for surface or panel mounting. It consists of an anodized aluminium case built according to the standard DIN 43700, with an aluminium panel coated with scratch-proof and non-corrosive polycarbonate membrane.

  • Page 12: Installation

    B&C Electronics PH 7685/E – Rev. B INSTALLATION PHYSICAL INSTALLATION The controller may be installed close to the points being monitored, or it may be located some distance away in a control area. The enclosure is designed for panel-mounting. It should be mounted on a rigid surface, in a position protected from the possibility of damage or excessive moisture or corrosive fumes.
  • Page 13 B&C Electronics PH 7685/E – Rev. B Connecting the electrode as a rule the shield of the coax cable is connected to the Reference electrode and fastened to the terminal 21 "L1". The central shielded wire is connected to the pH glass or the ORP metal electrode and fastened to the terminal 22 "H1".
  • Page 14 B&C Electronics PH 7685/E – Rev. B Connecting the RTD The instrument has the automatic Temperature compensation carried out by means of RTD Pt100. The Temperature sensor has to be installed in the same solution being measured, close to the pH sensor in the pipe-line or in the tank.

  • Page 15: Operating The System

    B&C Electronics PH 7685/E – Rev. B OPERATING THE SYSTEM Pre-operation check The system's controls and indicators are all located on the front panel (see fig. 1). The meter has a LCD display 1 indicating that unit is on. The cards of the controllers are adjusted at the factory.

  • Page 16: Software Description

    B&C Electronics PH 7685/E – Rev. B SOFTWARE DESCRIPTION 5.1 KEYBOARD FUNCTION ù - allows the operator to go to the next Display - allows to go back to the main Display. The eventual new parameter values will not be memorized §...

  • Page 17: Readout Sequences

    B&C Electronics PH 7685/E – Rev. B 5.2 READOUT SEQUENCES Applying the power to the instrument the display will show the input selected for approximately 3 seconds, then will show the main display ·DO·. pHmeter Glass Rx meter pHmeter Antimony ù...
  • Page 18 B&C Electronics PH 7685/E – Rev. B ---------------------------------- ·D0· -1000mV à AL ì BH 14,00pH ì AL à BH pH/mV main display and control relay status A (B): Set-point A (B) H (L): maximum (minimum) relay activated à relay delayed è...
  • Page 19 B&C Electronics PH 7685/E – Rev. B ù to go to ---------------------------------- Temp: 22.0°CM ·D2· Temperature value " M " manual value § to activate the Temperature calibration or the manual Temperature value selection procedures ù to go to ---------------------------------- ·D3·...
  • Page 20 B&C Electronics PH 7685/E – Rev. B ù to go to ---------------------------------- ·D4· 5.00pH *à HI 500mV *à HI SB: Set-point B parameters 5.00pH (500mV): pH/mV Set-point value à : actual set-point B status (relay activated) HI: Set-point function selected (maximum) * : alarm on set-point B function activated §...
  • Page 21 B&C Electronics PH 7685/E – Rev. B ù to go to ---------------------------------- ·D6BIS· 02 20.0mA/1000mV 02 20.0mA/14.0pH Analog output N°2 parameters (option 091.3711) 02: selected analog output 20.0mA : actual analog output value 14.0pH (1000mV) (100°C): actual input measuring value ù...

  • Page 22: Calibration Sequences

    B&C Electronics PH 7685/E – Rev. B CALIBRATION SEQUENCES The following procedures will be active whenever the instrument is not in the keyboard lock condition. To unlock the keyboard follows the procedures mentioned in chapter "Configuration". The following procedures allows the sensors calibration, the Set-point and alarms parameters programming.

  • Page 23: Ph And Orp Electrodes Calibration

    B&C Electronics PH 7685/E – Rev. B MESSAGE the selection is memorized UPDATE N O T E: The next calibrations follows the same proceeding, so only the active keys will be shown. 5.3.2 pH and ORP electrodes calibration The following procedure are suitable for both pH and ORP and for this reason will be described simultaneously.
  • Page 24 B&C Electronics PH 7685/E – Rev. B If the buffer is not recognized the "B" flashing message will appear on the Display. If the buffer is recognized the "B" message will stop flashing and the instrument will Display the value related to the measuring Temperature.
  • Page 25 B&C Electronics PH 7685/E – Rev. B ò ç to adjust the actual reading £ - to confirm the changing - to go back to ·D1· Display IMPORTANT NOTE: if the difference between 1st and 2nd point is less than 1 pH (or 100 mV), the unit will consider only the 1st point (ZERO adjustment).

  • Page 26: Temperature Calibration

    B&C Electronics PH 7685/E – Rev. B 5.3.3 Temperature calibration ù to go to ·D2· TEMP: 22.0°C § to access the calibration procedure CAL T 22.0°C >>>>>>: Temperature value over range ù to go back to ·D2· without memorizing ò...

  • Page 27: Set-Point A/B Calibration

    B&C Electronics PH 7685/E – Rev. B MESSAGE FUNCTION The calibration is accepted UPDATE Error messages Zero > 2.0°C z > 2.0°C The above message will last for 5 minutes £ to acknowledge the message The calibration is not accepted The unit turns to ·D2·...

  • Page 28: On/Off Function

    B&C Electronics PH 7685/E – Rev. B Set-point adjustment CAL SA S: 600mV CAL SA S:14.00pH SA: Set-point A adjustment 14.00pH (600mV): actual Set-point value ù to stop the procedure and to go back to ·D3· (·D4·) ò ç to insert the Set-point value £...

  • Page 29: Pfm Proportional Function (Option 091.211)

    B&C Electronics PH 7685/E – Rev. B ò ç to insert the delay time value £ to confirm and to go back to ·D3· (·D4·) 5.3.6 PFM proportional function CAL SA BP: 15mV CAL SA BP:0.15 pH 0.15pH(15mV): actual proportional band value ù...

  • Page 30: Pwm Proportional Function (Option 091.211)

    B&C Electronics PH 7685/E – Rev. B 5.3.7 PWM proportional function CAL SA BP: 15mV CAL SA BP:0.15pH 0.15pH(15mV): actual proportional band value ù to stop the procedure and to go back to ·D3· (·D4·) ò ç to select the proportional band value £...

  • Page 31: Alarm Adjustment

    B&C Electronics PH 7685/E – Rev. B 5.3.8 Alarm adjustment Both alarms (for ph and for ORP) acts on the same relay C. The following operations are possible: - to select the min/max alarm value - to select the delay time value ù...
  • Page 32 B&C Electronics PH 7685/E – Rev. B ò ç to select the value. £ to confirm and to go to the delay time selection. CAL AL D: 1.0s 1.0s: actual delay time ù to stop the procedure and to go back to ·D5·...

  • Page 33: Configuration

    B&C Electronics PH 7685/E – Rev. B CONFIGURATION The following operations are possible: - keyboard locked/unlocked selection - Display contrast selection - access number insertion ù to go to Display ·D7· Configuration ·D7· § to access the configuration sequences 5.4.1 Keyboard locked/unlocked...

  • Page 34: Lcd Display Contrast

    B&C Electronics PH 7685/E – Rev. B 5.4.2 LCD display contrast LCD contrast: 4 ù to go to ·D8· ò ç to select the contrast from 0 to 7 £ to confirm and to go to the access number insertion 5.4.3 Access number...

  • Page 35: Ph Electrode Type

    B&C Electronics PH 7685/E – Rev. B 5.4.4 pH electrode type Glass: glass electrode Input el.:Glass Antim.: antimony electrode Rx: ORP electrode ù to go to ·D8· ù ò ç £ Active keys: 5.4.5 Software filter SW 90% RT: 2.0s ù...

  • Page 36: Input Related To Analog Output N°2 (Option 091.3711)

    B&C Electronics PH 7685/E – Rev. B CAL P1: 0.00 pH P1: begin of range 0.00 pH (mV): measuring value related to 0/4 mA ù ò ç £ Active keys: CAL P2: 14.00 pH P2: end of range 14.00 pH (mV): measuring value related to 20 mA ù...

  • Page 37: Set-Point A Operating Mode (Option 091.211)

    B&C Electronics PH 7685/E – Rev. B CAL P1: 0.00 pH P1: begin of range 0.00 pH (mV): measuring value related to 0/4 mA ù ò ç £ Active keys: CAL P2: 14.00 pH P2: end of range 14.00 pH (mV): measuring value related to 20 mA ù...

  • Page 38: Set-Point B Operating Mode (Option 091.211)

    B&C Electronics PH 7685/E – Rev. B 5.4.12 Set-point B operating mode (option 091.211) (PWM/PFM) SET B ACT: ON/OFF On/Off,PWM,PFM: Set-point B operating mode ù ò ç £ Active keys: 5.4.13 Set-point B function SET B F.: HI SET B F.: LO LO: Minimum (relay activated for meas.

  • Page 39: Alarm On Set-Point B

    B&C Electronics PH 7685/E – Rev. B TIME SET A: 10m 10m: activation time ù ò ç £ Active keys: 5.4.15 Alarm on set-point B AL SET B: ON AL SET B: OFF ù ò ç £ Active keys: Two possible alternatives A or B.

  • Page 40: Alarm Relay Contact Function

    B&C Electronics PH 7685/E – Rev. B 5.4.16 Alarm relay contact function Two possible alternatives: AL RELAY: ACT AL RELAY: DEA ACT: active alarm = relay activated DEA: active alarm = relay deactivated ù ò ç £ Active keys: 5.4.17 New access number...
  • Page 41 B&C Electronics PH 7685/E – Rev. B The instrument ask the operator to insert again the new access number. Confirm Nr: ù ò ç £ Active keys: The double insertion of the new code assure the memorization of the right code.

  • Page 42: Normal Operation

    B&C Electronics PH 7685/E – Rev. B NORMAL OPERATION To operate the system, simply power the unit and observe the measured pH or ORP of the solution on the meter. Select the Set-point A, the Set-point B and the alarms to the setting required for each particular...

  • Page 43: Calibration

    B&C Electronics PH 7685/E – Rev. B CALIBRATION CALIBRATING THE PH-METER The pH controller is supplied with a laboratory calibration corresponding to a standard pH electrode with the "zero point" at pH=7 and the "slope" 58,16 mV/pH at 20 °C.

  • Page 44: Preventive Maintenance

    B&C Electronics PH 7685/E – Rev. B PREVENTIVE MAINTENANCE Controller Quality components are used to give the controller a high reliability. The frequency of such maintenance depends of each particular application. As in any electronic equipment, the mechanical components, such as relays and connectors, are the most subject to damage.
  • Page 45 B&C Electronics PH 7685/E – Rev. B - 45 -...
  • Page 46 B&C Electronics PH 7685/E – Rev. B - 46 -...
  • Page 47 B&C Electronics PH 7685/E – Rev. B - 47 -...

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