Hanna-instruments HI 23 Manual de usuario descargar pdf (Pagina 4)

FUNCTIONAL DESCRIPTION

1. Liquid Crystal Display

2. CAL DATA key last calibration data viewing (enters and exits)

3. LCD key exits from setup and reverts back to normal mode (in idle

or control phases with the measurement on the display).

During EC/TDS calibration, it alternates EC/TDS buffer

value and current cell constant on the display. In HI 24

series, it switches between EC and TDS reading

4. CAL key initiates and exits calibration mode

5. SETUP key enters setup mode

6.  key moves to the next digit/letter (circular solution) when se-

lecting a parameter. Same as  key during last calibration

data viewing mode

7.  key increases the blinking digit/letter by one when selecting a

parameter. Advances forward while in last calibration

data viewing mode. Increases the temperature setting

when temperature probe is not inserted

8. CFM key confirms current choice (and skips to the next item)

9.  key decreases the blinking digit/letter by one when selecting

a parameter. Reverts backward while in last calibration

data viewing mode. Decreases the temperature setting

when temperature probe is not inserted

10. LEDs

• Calibration: 2 points with Hanna EC and TDS calibration

solutions.

• Four different EC working ranges (0 to 199.9µS; 0 to

1999µS; 0 to 19.99mS; 0 to 199.9mS).

• Four different TDS working ranges (0 to 100.0ppm; 0 to

1000ppm; 0 to 10.00ppt; 0 to 100.0ppt) for HI 24 series.

• Possibility to switch to TDS measurements with conversion

factor from 0.00 to 1.00 (HI 24 series).

• Temperature compensation of the HANNA standard solu-

tions.

• Temperature compensation of the EC and TDS reading with

temperature coefficient ß selectable from 0 to 10%/°C.

• Use of a 3-wire Pt 100 temperature sensor to compensate

for the cable resistance and have a precise automatic tem-

perature compensation of the measurements in long dis-

tance applications.

• Manual temperature setting when the temperature probe is

not inserted or the temperature exceeds the upper range.

• Last calibration data internally recorded (nonvolatile EE-

PROM memory): calibration date and time, cell constant,

calibration solution values.

• Input: 4-ring EC/TDS probe with cell constant 2.0 ± 10%,

or 4-20mA analog input from a transmitter.

• Analog output (HI 23xy1 and HI 24xy1)

- isolated 0-1 mA, 10 KΩ maximum load (optional);

- isolated 0-20 mA, 750 Ω maximum load (optional);

- isolated 4-20 mA, 750 Ω maximum load (optional);

- isolated 0-5 VDC, 1 KΩ minimum load (optional);

- isolated 1-5 VDC, 1 KΩ minimum load (optional);

- isolated 0-10 VDC, 1 KΩ minimum load (optional).

• Real time clock.

• Serial comunication via RS485 with the possibilities to set

the working parameters and to read the displayed data (HI

23xy2 and HI 24xy2).

• Calibration and Setup procedures allowed only through

an unlock password.

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Hanna-instruments HI 23 Manual de usuario Pagina 4

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