Hofmann DPH-64 User Manual Download Page 22

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Reset to Defaults

This feature, if applied, cancels all customer programming and returns

the DPH-64 to factory defaults. Press VALUE several times until “Please

Wait… ” appears then keep depressed for several seconds. Reset is

finished when ‘SAVED’ is displayed.

.1/ Selecting P1 and P2 pulse output.

PAGE 22

DPH-64 Instruction manual

Summary of Contents for DPH-64

Page 1: ...DIGITAL pH mV CONTROLLER DPH 64 USERS GUIDE DPH 64 Instruction manual PAGE 1 ...

Page 2: ...gurations for the DPH 64 11 Calibrating pH or mV 11 Setting Time and Day 12 Calibrating 4mA and 20mA with a multimeter 12 Changing mode of operation 14 Extended Features 16 Timed relays 17 S1 relay used as a TIMER 18 S2 as ALARM RELAY 18 S3 S4 with DELAY 18 S3 S4 Proportional 19 S3 S4 Temperature 19 4 20mA SETPOINT 20 P1 P2 Pulse output 21 Reset to Defaults 22 WIRING GUIDE 23 PAGE 2 DPH 64 Instruc...

Page 3: ... Maximum termination impedance to drive 20mA is 1000 Ohms Can also be setup to follow setpoint for signal driven metering pumps Relay outputs 2 relays S1 S2 switched active with neutral and earth terminals Contacts rated 240V 5AMPS non inductive 2 relays S3 S4 with potential free changeover contacts Timers can be activated to enable disable relay outputs for programmed times Set points All relays ...

Page 4: ...m Pulse output P1 and P2 are contact closure non polarised pulsed outputs Minimum pulse duration 250mS 500 volt isolation to instrument output Maximum voltage across terminals 100 volts Pulse rate Select maximum pulse rate per minute from 50 to 100 pulses Slope of pulse frequency 0 5pH to 2pH above below SET POINT Power supply 240V 50H 8VA max Construction Fully sealed construction with hinged cle...

Page 5: ...ach relay output can be linked with a timer to operate only at programmed times The signal generated from a pH electrode is extremely weak with a very high impedance and therefore very sensitive to electrical interference This necessitates the use of shielded cable for the connection of the electrode A coaxial cable with an additional outer layer of carbon must be used to ensure a steady pH signal...

Page 6: ...ogrammed times S1 operating as timer output starting in real time and selected duration biocide dosing etc S2 used as an alarm with separate programmable high low alarm set points Time delay between S3 S4 to avoid overshoot when dosing acid and alkaline simultaneously S3 and S4 used in proportional mode with adjustable gradient of pulsing S3 and S4 linked to temperature with programmable temperatu...

Page 7: ...LCD display continu ously averages the electrode input and displays an increase decrease or steady pH mV This is handy as it enables an operator to see instantly if a dosing cycle is changing the pH or mV in a system All setpoints modes and calibration values are stored separately for pH and mV therefore a complete configuration for each mode is possible and is saved in memory Switching from pH to...

Page 8: ...a pH electrode See Signal input The metal electrodes used for redox measurements are of much lower resistance and longer coaxial cables can be used without any special precautions Insert a round headed screw into the panel where the instrument is to be attached This screw determines the centre of the instrument location Fig 3 Slide the instrument over the slot opening at the back check that the un...

Page 9: ... must be used if the location between electrode and controller exceeds 10 meters Special consideration also must be given when placing an electrode in a treatment bath or pool The point of injection of neutralising agent and placement of the electrode distance between them largely determines the dosing characteristics of the DPH 64 F Only use special co axial cable to connect a pH electrode to the...

Page 10: ...ile memory and are not lost through power failure An internal battery runs the real time clock if power is not present Relays S1 to S4 enabled Dosing Mode SETPOINT normal dosing Dosing S1 and S3 UP Dosing S2 and S4 DOWN Setpoint S1 and S3 6 00pH Setpoint S2 and S4 8 00pH P1 and P2 pulse output is disabled Temperature Compensation Manual 20 0o C Temperature hidden from display 4 20mA normal output ...

Page 11: ...riate window Press MODE to move to the MANUAL window to switch relays on and off manually Calibrating pH or mV The calibrate to field when entering a calibration automatically jumps to the nearest whole pH or 100mV of the measured electrode input This minimises excessive scrolling to obtain a number To change to a specific pH or mV dial the desired value and save 1 Functions accessible from the ma...

Page 12: ...enu Calibrating 4mA and 20mA with a multimeter The output current can be accurately calibrated to achieve exact monitoring when connecting the 4 20mA to a data logger or central monitor system A real current calibration is carried out by connecting a multi meter across the terminals no termination resistor is required to measure the mA current 1 Setting Time and Day 1 Calibration menu for mV ORP P...

Page 13: ... VALUE The current to the meter is corrected to read exactly 4 00mA Use the same procedure for 20mA If for some reasaon you do not get the exact current the first time simply repeat the calibration F If a configuration or number is accidentally changed in a setup window exit by pressing MODE repeatedly to return to the main window This ensures no unwanted changes are saved However make sure the mo...

Page 14: ... operation up or down dosing temperature compensation and 4 20mA setup Extended features moves to the advanced modes of operation possible with the DPH 64 controller 1 Selecting mode of operation 1 Selecting up down mode 1 Changing setpoints and deadband PAGE 14 DPH 64 Instruction manual ...

Page 15: ... 1 Selecting mode of temperature compensation 1 Show or hide temperature with LCD display 1 Configuration of 4 20mA range DPH 64 Instruction manual PAGE 15 ...

Page 16: ...ate either as a timed relay or as a dedicated timer S2 will operate as a normal setpoint output for up down dosing or as an alarm with a combined low and high setpoint For simultaneous up down dosing a time delay can be enabled between S3 and S4 if operated in normal setpoint mode Proportional dosing can be invoked for S3 and S4 in normal dosing mode Alternatively S3 and S4 can operate as a temper...

Page 17: ...in the time programmed in the configuration menu Make sure that selected time and day are saved as well as saving the timer ON function If S2 is operating as ALARM the timed relay option is not avaliable F Save selected time first and then again save TIMED RELAY as ON when returning to the previous window 1 Setting up TIMED RELAY 1 DPH 64 Instruction manual PAGE 17 ...

Page 18: ... as ALARM RELAY For a simple alarm setup use this option as only one relay output is used The normal setpoint is replaced by a low and high setpoint Low alarm is set from 0pH to 1pH below high or high can be set from pH14 to 1pH above low S3 S4 with DELAY DELAY only operates when normal setpoint for S3 and S4 is selected This feature will eliminate possible hunting between metering pumps or dosing...

Page 19: ...hen 10 mV or less than 0 5pH below above setpoint giving a very steep gradient The on off ratio reduces very rapidly Up or down mode is possible with normal proportional dosing Look up Fig 6 for gradient versus pulse output Proportional dosing can be used with the timed relay option to only operate at programmed times or days S3 S4 Temperature A HOFMANN TP 150 temperature sensor must be connected ...

Page 20: ...n UP mode the signal current increases as the mV falls below the setpoint In DOWN mode the signal current increases as the mV rises above the setpoint Linear and 5 non linear settings help to further fine tune a dosing setup The effects of the non linear functions are shown in Fig 19 F The DPH 64 automatically returns to the main window after 2 minutes if left anywhere in the configuration or cali...

Page 21: ...s per minute Additional refinement of dosing is achieved with linear and 5 non linear pulse rate settings Pulse output is an actual contact closure thus guaranteeing triggering of all metering pumps P1 and P2 can be programmed with the TIMED RELAY feature to only operate at certain times or days F Never apply 240VAC to these outputs Permanent damage will result 1 Selecting P1 and P2 pulse output 1...

Page 22: ...mer programming and returns the DPH 64 to factory defaults Press VALUE several times until Please Wait appears then keep depressed for several seconds Reset is finished when SAVED is displayed 1 Selecting P1 and P2 pulse output PAGE 22 DPH 64 Instruction manual ...

Page 23: ...ing easy if a 240VAC device is used See Fig 23 P1 and P2 are contact closure outputs and polarity does not have to be observed when connecting a metering pump Max ratings are 100V and 30mA Never connect 240VAC to the pulse output Instant permanent damage will occur Polarity has to be observed when connecting the 4 20mA current output A TP 150 temperature electrode connected will enable automatic c...

Page 24: ...ty does not cover any carriage costs The warranty is void if The instrument is damaged due to rough handling or transport after purchase The article has not been used in accordance with the operating instructions Any parts in the instrument have been changed or have been altered in any way The serial number is removed or defaced All other warranties and conditions express or implied are void DPH 6...

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