Specifications.

• *Range: 0-14pH/0-1000mV
• *Resolution: 0.01pH/1mV
• *Accuracy: 0.05pH/2mV
• *Display: 3.5 digit LCD for each input and controller
• *Calibrations: Stored in non-volatile memory
• *Electrodes: x2 BNC connections, external of housing
• *Signal Outputs: x2 isolated 4-20mA outputs, each software configured over 0-14pH/0-1000mV range
• *Control Range: Setpoint range from 0-14pH/0-1000mV
• *Hysteresis: Programmed at 0.25pH/10mV
• *Timer: ON TIME: 1 minute to 2 hours, OFF TIME: 1 minute to 30 minutes
• *Timer Modes: Looped mode will toggle timer ON/OFF in continuous loop
• *Output Relays: x2 240VAC @5Amps max. resistive, fused, configured for either dosing up or down
• *Pulsed Outputs: Adaptively adjusts pulse width from continuously ON to min. of 1.5 secs each 60 secs
• *Alarm Relays: x2 240VAC @5Amps max. resistive, potential free contacts
• *Power: 240VAC 50Hz 7VA max.
• *Enclosure: Thermoplastic with hinged transparent lid, IP55 rated
• *Dimensions: 215(W)mm x 185(H)mm x 115(D)mm

Features.

The DPH-4 instrument contains separate pH/ORP controllers facilitating an efficient installation.

The pulse outputs exhibit a very wide duty cycle. The ON and OFF times are both dynamic, both varying from 1.5 to 60 seconds. This makes for a fully dynamic dosing controller which adapts for widely varying conditions in industrial plant installations. Low and high setpoints can be selected for the alarm relay. This relay may also be used as an additional set point.

The controller allows the operator to configure various timing modes to prevent any abnormal levels of chemicals or overshooting of the set points. ON TIME is triggered every time the instrument calls for dosing. This time delay is adjustable from 1 minute to 2 hours in 1 minute increments If ON TIME is exceeded without the set point relay deactivating, OFF TIME activates, locks out the relay for the set OFF TIME. Lockout time can be adjusted for 1-30 minutes. ON and OFF times are indicated with the timer LED pulsing in green or red.

In LOOPED mode ON TIME and OFF TIME toggle state if continuous dosing is called by a possible fault in the system.

More stringent protection can be applied with TERMINAL mode. If a dosing cycle time exceeds ON TIME and OFF TIME, dosing is shut down. The instrument can only be reset with a manual reset or optionally by switching off the power for approx. 10 sec. (This allows for an installation with a remote reset.)

The alarm configurations allow for the alarm relay to be activated if any of the described conditions exist in the LOOPED or TERMINAL mode.

The 4-20mA output range is scalable and is setup via the program.

A flow switch input locks out the relay output. This input can be configurerd for normally open or normally closed. (N/O or N/C).

The instrument requires permanent wiring of the supply voltage, metering pumps or solenoid valves.

The DPH-4 with proper installation methods and the transparent cover in place, provides a reliable and waterproof installation.

DPH-4 Brochure

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DPH-4 Manual

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