Controllers & Transmitters
HI8720 ORP Analog Controller with Self-Diagnostic Test
HI8720 ORP Analog Controller with Self-Diagnostic Test

 

HI8720 ORP Analog Controller with Self-Diagnostic Test

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Mô tả

HI8720 ORP panel mounted controller is ideal for process control monitoring in a wide range of industrial applications, allowing for the selection of a set point for oxidizing or reducing dosage.

Auto-Diagnostic Feature

  • Built-in autodiagnostic functions to enable the user to check and troubleshoot any malfunctions. The functions are made via front panel keys to isolate the cause of malfunction.

Outputs

  • You can choose the output configuration for connecting a recorder or a PLC, between 0-20 or 4-20 mA.

Consent Contacts

  • These contacts (maximum 2A, 220 V) are used for reduction and oxidation reactions when the pH controller is used in conjunction with an ORP Controller and vice versa. In these applications, the consent contacts of both meters are connected together to link the ORP and pH controllers so that ORP dosage will occur only if the actual pH value is correct. This is to avoid overdosage of oxidants or reductants which may lead to undesirable pollution.

ORP Dosing Consent Device

  • When used in conjunction with the HI 8710 pH controller, the ODCD (ORP dosing consent device) function (featured by the HI 8710) will ensure that the ORP dosage will start only when the pH level is correct.

Alarm Contacts

  • If the measured ORP is not within the tolerance of the set value, the alarm contact is closed. This can occur if there is insufficient dosage or if there is overdosage.

Robust Design

  • A removable, transparent splash-proof cover protects the front panel.

mV

mV Range ±1999 mV
mV Resolution 1 mV
mV Accuracy ±5 mV; ±0.5% (input from transmitter)
mV (ORP) Calibration offset: ±200 mV with CAL trimmer;

Process Control Meter

Alarm Relay Set Point 1, isolated, 2 A, max 240 V, resistive load, 1000000 strokes (not fuse protected)
Alarm Relay Range 10 to 300 mV
Dosing Control OFF/AUTO/ON with selection switch
Over Dosing Control adjustable, from 5 min to 60 min with knob or disable by wire strap - on rear panel
Backlight continuous on
Voltage Output ±5 Vcc; 150 mA max load for amplified electrodes
Enclosure flame retardant ABS body and front panel; transparent splash-proof front cover
Panel Cutout 141 x 69 mm (5.6 x 2.7’’)
Recorder Output 0-20 mA or 4-20 mA (isolated)
Set Point 1, isolated, 2 A, max 240 V, resistive load, 1000000 strokes (not fuse protected); range:±1999 mV
Power Supply 230 VAC ±10%; 50/60 Hz
Environment -10 to 50°C (14 to 122°F); RH max 95% non-condensing
Weight 1 kg (2.2 lb.)
Ordering Information The HI8720 is supplied complete with mounting brackets and instructions

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