The HI 21 controllers are simple-to-operate, microprocessor-based process meters packed with features. For more flexibility and better resolution for chart recorders, any two points between 0 and 14 pH can be chosen to correspond to the analog output spans. Some HI 21 models are equipped with a bi-directional RS485 port, which allows remote control of the instrument from a PC.

Push button password programming prevents tampering. The microprocessor memory is fully programmable and has a 3 month backup power supply. The fail Safe Alarm system protects the HI 21 against the pitfalls of process control, like power interruption or line failure.

With HI 21 quick 1, 2 or 3 point calibration at pH 4.01, 7.01 and 10.01 comes standard.

The temperature can be manually or automatically compensated for. You can also choose from ON/OFF, Proportional and PID control to save on chemicals.

De technische specificaties van dit product:

Accuracy		±0.02 pH; ±0.5°C
Alarm Relay		contact outputs SPDT 5A-250 Vac, 5A-30 Vdc (resistive load); fuse: 5A, 250V
Analog Output		0-1 mA, 0-20 mA and 4-20 mA, 0-5 Vdc, 1-5 Vdc and 0-10 Vdc
Digital Output		RS485 bi-directional opto-isolated;
Dimensions		221 x 181 x 86 mm (8.7 x 7.1 x 3.4")
Environment		0 to 50° (32 to 122°F); RH max 85% non-condensing
Input Impedance		1012 Ohm
pH Calibration		automatic, 1, 2 or 3 point, at pH 4.01, 7.01, 10.01
Power Consumption		15 VA
Power Supply		115 Vac ±10% or 230 Vac ±10%; 50/60 Hz; fuse: 400 mA, 250 V
Protection		IP 54
Range		0.00 to 14.00 pH; -9.9 to 120°C
Resolution		0.01 pH; 0.1°C
Setpoint Relay		1 or 2 contact outputs SPDT 5A-250 Vac, 5A-30 Vdc (resistive load); fuse: 5A, 250V
Temperature Compensation		Automatic (Pt100 probe) or manual from -9.9 to 120°C
Weight		1.4 kg (3.1 lb.)

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