Redox manual - Aqua Water Systems

The box containsM20 instrument, instruction manual, mounting accessories, fuse.General featuresMeasuring range0-1000mVFunctionsMeasure, control and regulation of ORP (REdOx)Resolution±1mVDisplayLCD 3 ½ DIGITAccuracy± 1% E.S.ControlsKeyboard (5 keys)Set-point2 points ON/OFF 5A (volt free contact)Output Analogue 4-20mA selectable for recorder or proportional to the set point 2HysteresisSet point hysteresis programmableDelay timeDelay time on set point programmableP.i.d.Selectable on set point 2 in time/pause wayPower supply230 Vac 50Hz (optional 110/ 24 Vac)Consumption5WFuse315 mA delayedBoxIP65 Plastic boxDimensions180X115X75 mmWeight560 gr.WarningDo not open the case or make connections inside the instrument unless it isdisconnected from the power sourceBefore connecting to power, ensure that the available supply corresponds withthe rating on the instrument labelM20W PH INST GB V001Page 2 of 8 05/08/2013

DimensionsElectrical connections* out Set1 and Set2 free contactM20W PH INST GB V001Page 3 of 8 05/08/2013

Power supplyConnect the power supply wires to the terminals 1-Line and 3-Neutral (2 earth) and powerup the instrument. The display will show the software version and then switch to standardoperating mode.DescriptionDisplayLed relaystatusUp – DownkeysLed zerocalibrationStart calibrationkeyKey menuset-pointadjustmentMenu functionkeyCalibration Connect the probe to the instrument & place probe into the buffer solution (e.g. 475mV), then press the CAL button. The RED ZERO led will start flashing.Adjust display to the buffer solution value (e.g. 475 mV) using the UP and DOWNkeysEnsure the reading is stable then press CAL button to complete calibration procedure.During calibration if no buttons are pressed for 60 seconds the instrument willautomatically return to the operating mode.The gain led performs no function on this model.M20W PH INST GB V001Page 4 of 8 05/08/2013

Set-Point adjustmentSet-point 1 Push SET key, the corresponding GREEN LED, will flash and the display will show thevalue previously set (default 500 mV). Adjust using the UP and DOWN keys until the display reaches the desired value. Press the SET button to confirm, the hysteresis setting is shown next. The display will show previously set value (default 0000H), Adjust by pressing the Upand DOWN buttons. This is in steps of 10 mV (1h=10mV, 2H=20mV). Press the Set key to confirm the value and to move on to the delay time setting. The display shows the delay time value to active or deactivate the set-point (default00d= 0 seconds). Adjust by pressing the UP and DOWN keys to modify the valuefrom 0 to 99 seconds. The delay time activates on powering up the instrument. Duringthe delay time the state of the relay will not change irrespecitve of the mV value, thisis to allow time for the reading to stablise. Press the SET button to confirm the value and move to adjusting Set-point 2.Set point 2 Adjusting Set-point 2 is exactly the same as Set-point 1. After completing both set-points, pressing SET will take you back to the operatingmode.If no buttons are pressed for 60 seconds during set-up, the instrument willautomatically return to the operating modePress SetAdjust Set Point 1Press SetAdjust Set Point 1 HysteresisPress SetAdjust Set Point 1 DelayPress setAdjust Set Point 2Press SetAdjust Set Point 2 HysteresisPress SetAdjust Set Point 2 DelayPress SetConfirm and exit setupM20W PH INST GB V001Page 5 of 8 05/08/2013

FunctionsFunctions 1 to 8 control how the instrument operates, selecting A (activate) or d(deactivate) changes the behaviour of the relays. Factory default is for all functions = d.Active / Deactive instrument functions Push FUN key, the display will show F1 with the function state (d = Deactived, A =Actived).Pressing the UP or DOWN buttons alters the function state.To confirm choice press the FUN key, if you have changed the function state, theinstrument will store the value and return to the operating mode; otherwise it cycles tothe next function up to function F8, then back to the operating mode.During set-up, if no buttons are pressed for 60 seconds the instrumentautomatically reverts back to operating modeDirect or reverse modeFunction Set-point 1 mode: direct (below set-point relay closed)F1_dFunction Set point 1 mode: reverse (above set-point relay closed)F1_AFunction Set-point 2 mode: direct (below set-point relay closed)F2_dFunction Set point 2 mode: reverse (above set-point relay closed)F2_A.Factory default is for all functions to be deactivated, therefore the output relay is closedwhen the measurement is lower then the set-point value. To change this condition it isnecessary to activate F1, for set-point 1, and activate F2 for set-point 2.Hysteresis or double thresholdFunction set point 1 with hysteresis applied in the direction of controlF3_dFunction set point 1 hysteresis applied above and below the set pointF3_AFunction set point 2 with hysteresis applied in the direction of controlF4_dFunction set point 2 hysteresis applied above and below the set pointF4_AHysteresis function creates a no-operation range around the set-point value. In this areathe relay will not operate, e.g. 01H creates a range of 10 mV).E.g.: set point is 750mV, F1 (or F2) deactivated, with 01H, relay will close at 760mV butopen at 750mV.If you activate function F3 (set-point 1) or F4 (set-point 2) the hysteresis value will beapplied above and below the set point.This creates a a window around the set-point value.Eg:: set-point set on 600 mV and hysteresis on 10H, creates a window between 500mVand 700 mV. Inside this range the relay is off, outside this range the relay is on. It ispossible to reverse this condition by changing the parameters F1 and F2. This function canbe used to create an alarm window.Function F5 unusedM20W PH INST GB V001Page 6 of 8 05/08/2013

4-20mA current outputFunction Relay on set point 2 ON/OFF control and 4-20mA output for recorderF6_dFunction Relay on set point 2 proportional time/pause and 4-20mA outputF6_A proportional to the set point 2 valueWith F6 deactived (default) the set-point 2 relay operates in simple ON/OFF mode and theisolated 4-20 mA output signal is proportional to the full scale range (4 mA = 0 mV; 20mA = 1000 mV).When F6 is actived, the set-point 2 relay operates in proportional time/pause mode & the4-20 mA output signal is proportional to the set-point value.With F6 activated the signal is 4 mA when the reading is at the set-point value andincreases the further the reading moves away from the set point. Using the F2 function itis possible to choose whether the 4-20 mA signal operates above or below the set point.(activated = above; deactivated = below)4-20mA proportional rangeFunction4-20 mA proportional signal on set point 2 with range of 100 mVF7_dFunction4-20 mA proportional signal on set point 2 with range of 50 mVF7_AThis function alters the range over which the 4 -20 mA ouput changes. Deactivated therange is 100 mV from the set point. Activated the range drops to 50 mV to provide afaster response.20 mAF7 = dF7 = a4 mASetpoint+ 100 mV Setpoint+ 50 mVFunction F8 unusedNotes:M20W PH INST GB V001Page 7 of 8 05/08/2013