6
SPECIFICATIONS
4. SPECIFICATIONS
4.1. HI981412 pH DOSING SYSTEM
Range *
0.00 to 14.00 pH
-5.0 to 105.0 °C (23.0 to 221.0 °F)
Resolution
0.01 pH
0.1 °C (0.1 °F)
Accuracy
@ 25 °C (77 °F)
±0.10 pH
±0.5 °C (±0.9 °F)
Calibration
• User calibration:
automatic, one or two-point with buffer solution (4.01, 7.01, 10.01 pH)
• Process calibration:
single point, adjustable (±0.50 pH around measured pH)
Temperature
compensation
Automatic
High or Low mode
Operation
pump control
• On/Off control using adjustable set point (4.00 - 10.00 pH)
with adjustable hysteresis (0.10 to 1.00 pH)
• Proportional control using adjustable set point (4.00 - 10.00 pH)
with adjustable proportional band (0.10 to 2.00 pH)
• Startup delay timer at power-on (0 to 600 sec.)
• Pump flow control 0.5 to 3.5 Liter/hour (0.13 to 0.92 Gallon/hour) and
maximum output pressure 1 atm (14 psi)
• Manual control for pump priming (defined in setup)
pH alarms
• High & Low with enable or disable option
• Triggered after 5 sec. if the controller records consecutive readings
over or under threshold values
• Level with enable or disable option
• Overtime protection (1 to 180 min. or Off)
Controller
alarm system
• Intuitive alarm system, using red, yellow and green color coded backlight
• User-selectable, alarm setup options
Alarm relay output
• SPDT 2.5A / 230 Vac
• Activated by pH-selectable alarm conditions
Probe input
• Quick connect DIN connector
• Galvanic isolation
* The range may be limited by the probe’s limits.
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