- Auto-diagnostic tests for electrode and instrument status.
- Displays values on the easy to read LCD.
- A removable, transparent splash-proof cover protects the front panel.
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 |
US 22017 
GB 17532 
BR 17417 
CA 10088 
AU 10055 
IE 5557 
IN 4737 
NZ 2483 
