Testronics - DPH-64 Single input pH/ORP controller with timers

DPH-64 Single input pH/ORP controller with timers

Specifications.

*Range: 0-14pH/0-1000mV
*Resolution: 0.01pH/1mV
*Accuracy: 0.05pH/2mV
*Display: Dot matrix 4 line by 20 character backlit LCD
*Calibrations: Stored in non-volatile memory
*Electrode: BNC connection, external of housing
*Temperature: (pH only) manual or automatic temperature compensation (ATC) 0-100 degC
*Signal Output: Isolated 4-20mA output, range is software selected between 0-14pH or 0-1000mV.
Can also be setup to follow setpoint for signal driven dosing pumps
*Control Range: Setpoint range from 0-14pH/0-1000mV
*Deadband: Programmable from 0.1-1.0pH or 10-50mV
*Timers: ON TIME: 1 minute to 2 hours, OFF TIME: 1 minute to 30 minutes
*Timer Modes: Looped mode will toggle ON/OFF timers in continuous loop
*Output Relays: x2 (S1 & S2) with switched active 240VAC @5Amps max. resistive x2 (S3 & S4) 240VAC @5Amps max. resistive with potential free changeover contacts. Timers can be activated to enable/disable relay outputs for programmed times
*Set Points: All relays configurable for UP/Down dosing. Enable a Time delay 30-120secs between S3 & S4 if acid/alkaline dosing required
*Clock: Realtime clock, AM/PM or 24Hr mode
Four week calender to use for monthly dosing
Battery backup of all data
*Additional Relay Functions:
S1 & S2 can be setup for realtime ON/OFF timing
S1 & S2 setpoint can be linked to the temperature input for temperature control or alarm S3 & S4 are configurable as HIGH/LOW alarm
*Pulse Outputs: P1 & P2 are contact closure non-polarised outputs, min. pulse duration 250msec
Maximum voltage across terminals 100 volts
*Pulse Rate: 1 to 100 pulses/minute maximum. Slope of pulse frequency adjustable from 0.5-2.0pH above/below SET POINT
*Alarm Input: The operation of all the relays can be disabled with a contact closure input (i.e flow switch)
*Power: 240VAC 50Hz 8VA max.
*Enclosure: Thermoplastic with hinged transparent lid, IP55 rated
*Dimensions: 215(W)mm x 185(H)mm x 115(D)mm

Features.

A 4 line by 20-character LCD display allows text messages or prompts in proper language without confusing abbreviations. Encoder knobs are rotated to scroll through different menus, values or changing set points. Once a mode of operation, calibration value or setpoint is dialled simply push the encoder knob to select.

All custom configurations are stored in non-volatile memory. A real time clock is always present and relay outputs can be linked with a timer to operate only at programmed times.

The DPH-64 is shipped with its basic setup of all four relays set point controlled for up or down dosing. The DPH-64 features 6 relay outputs with a multitude of configurations possible to make this instrument suitable for almost every installation where pH, ORP, temperature control or timer output is required. Default label names for these outputs are S1, S2, S3, S4 and P1, P2. Individual labels can be entered to correspond with actual installation names or numbers.

All other features are hidden when scrolling through the software setup. The appropriate setup window only appears once a feature is enabled. Scrolling through a setup is therefore much easier to follow.

Extended features possible are:
All relays linked with a timer to operate only at programmed times.
S1 and S2 setup as timer outputs starting in real time. (biocide dosing etc.)
S2 used as an alarm with a programmable high, low window.
A time delay between S3 & S4 to avoid overshoot when dosing acid and alkaline simultaneously.
S3 and S4 used in proportional mode. (also adaptive proportional)
S3 or S4 linked to the 4-20mA current output for dosing with a current signal controlled pump.
S3 and S4 linked to temperature with programmable temperature setpoint.
P1 and P2 used with dosing pumps requiring a pulse input.
A 2 way terminal connects an alarm input (opto coupled) for relay lock out. Flow switches with normally open or closed operation can be used.

The DPH-64 with proper installation methods and the transparent cover in place, provides a reliable and waterproof installation.