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Table of Contents
Summary of Contents for Hofmann DPH-64
- Page 1 DIGITAL pH/mV CONTROLLER DPH-64 USERS GUIDE DPH-64 Instruction manual PAGE 1...
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Page 2: Table Of Contents
Instrument ....8 Wiring of the DPH-64 ... . . 9 Electrodes ....9 Starting up the Instrument. -
Page 3: Specifications
Set points: All relays can be configured for up/down dosing. Enable a Time delay of 1 to 5 minutes between S3 & S4 if acid / alkaline dosing is required. DPH-64 Instruction manual PAGE 3... - Page 4 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. Fully sealed construction with hinged clear acrylic Construction: front cover. IP55 specifications. Dimensions: (W)215mm x (H)185mm x (D)115mm. PAGE 4 DPH-64 Instruction manual...
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Page 5: Introduction
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. The DPH-64 converts the electrode signal with a precision input amplifier and then further processes the electrical signal for display, alarm, signal and set point controls. - Page 6 ORP, temperature control or timer output is required. Default label names for these outputs are S1, S2, S3, S4 and P1, P2. The DPH-64 is shipped with its basic setup of all four relays set point controlled for up or down dosing.
- Page 7 DPH-64. An “activity indicator” in the top right corner of the LCD display continu- ously averages the electrode input and displays an increase, decrease or steady pH / mV.
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Page 8: Installation
The DPH-64 should be installed near the treatment plant. Maximum length of the co-axial cable used should not exceed 10 metres because of the very high input impedance characteristic of a pH electrode. -
Page 9: Wiring Of The Dph-64
Plug the power cord into the supply and switch on the DPH-64. The LCD display lights up and shows pH and Time. Some LED’s may light up depending on the electrode or simulator input present. -
Page 10: Configuration
4mA = 0.00pH 20mA = 14.00pH The DPH-64 automatically returns to the main window after 2 minutes if, for some reason, left anywhere in the configuration or calibration menu. The DPH-64 automatically returns to the main window after 2 minutes if left anywhere in the configuration or calibration menu. -
Page 11: Configurations For The Dph-64
Configurations for the DPH-64. Press ‘MODE’ to go to the first configuration window. The selections here are to calibrate an electrode or mA current output and set time. To scroll the selections rotate the ‘VALUE’ knob. Pressing again selects this option and enters the appropriate window. -
Page 12: Setting Time And Day
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. PAGE 12 DPH-64 Instruction manual... - Page 13 The meter can also be connected in series in an already existing installation. (See Fig.8) Connect the multimeter to the 4-20mA terminals of the DPH-64. Select the DC current range 20 or 200mA of the meter. Calibrating 4-20mA with a multimeter.
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Page 14: Changing Mode Of Operation
This window contains all the configuration menus for mode of 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. Selecting mode of operation. .1/ Selecting up/down mode. - Page 15 Selecting mode of temperature compensation. .1/ ! Show or hide temperature with LCD display.. .1/ " Configuration of 4-20mA range. .1/ # DPH-64 Instruction manual PAGE 15...
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Page 16: Extended Features
The last option RESET TO DEFAULTS if activated returns all functions of the DPH-64 to the default configuration as outlined on page 10. Some options obviously are exclusive to each other such as S1 can only operate 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. -
Page 17: Timed Relays
ON function. If S2 is operating as ALARM the timed relay option is not avaliable. Save selected time first and then again save TIMED RELAY as ON when returning to the previous window. Setting up TIMED RELAY 1 .1/ % DPH-64 Instruction manual PAGE 17... -
Page 18: S1 Relay Used As A Timer
DELAY only operates when normal setpoint for S3 and S4 is selected. This feature will eliminate possible hunting between metering pumps or dosing valves when treating effluent with an acid and alkali neutraliser. A time delay from 1 to 5 minutes can be selected. PAGE 18 DPH-64 Instruction manual... -
Page 19: S3 / S4 Proportional
S3 / S4 Temperature A HOFMANN TP-150 temperature sensor must be connected to use temperature control with S3 and S4. Both can be set for above or below temperature operation with a setpoint range from 0 to 100 C and an adjustable deadband of 0.2 to 10.0... -
Page 20: 4-20Ma Setpoint
The effects of the non-linear functions are shown in Fig. 19 Non-linear effects with 4-20mA current output .1/ ' The DPH-64 automatically returns to the main window after 2 minutes if left anywhere in the configuration or calibration menu. PAGE 20... -
Page 21: P1 / P2 Pulse Output
P1 and P2 can be programmed with the TIMED RELAY feature to only operate at certain times or days. Selecting P1 and P2 pulse output. .1/ Non-linear pulsing of P1 and P2. .1/ Never apply 240VAC to these outputs! Permanent damage will result. DPH-64 Instruction manual PAGE 21... -
Page 22: Reset To Defaults
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. -
Page 23: Wiring Guide
Polarity has to be observed when connecting the 4-20mA current output. A TP-150 temperature electrode connected will enable automatic compensation for pH. S3 and S4 can now be connected to a heater (etc) for temperature control. Wiring options for the DPH-64. .1/ ! DPH-64 Instruction manual PAGE 23... - Page 24 WARRANTY We, HOFMANN ELECTRONICS, guarantee this unit against de- fects due to faulty manufacture or breakdown of components for a period of twelve month from the date of purchase, subject to the following provisions: ° The guarantee will cover original failure of parts and natural defects due to manufacturing causes.
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