Functional Description; Specifications - Hanna Instruments pH 21 Instruction Manual

FUNCTIONAL DESCRIPTION

1. Liquid Crystal Display
2. CAL key, to enter and exit the calibration mode
3. CFM key, to confirm calibration values
4. °C and °C keys, to manually set temperature value for
compensation
5. HOLD key, to freeze reading on display
6. RANGE key, to select measurement range
7. ON/OFF key, to turn the meter on and off
REAR PANEL
1. BNC connector for pH or ORP (pH 21 only) electrode.
2. Temperature probe socket for use with the HI 7662.
3. Power supply input. Plug the 12 Vdc adapter into the DC socket,
then into the mains.
Notes:
• Make sure the mains line is protected by a fuse.
• If the instrument needs to be unplugged, press the ON/OFF
key before disconnecting it from the mains.
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Note: These instruments use the following configuration.
+
It is recommended to use the Hanna HI 710005 or HI 710006
voltage adapters (supplied with the meter) which are provided with
the proper polarity configuration.
The meters can also be powered with other adapters. In this case,
remember to check the correct polarity of the adapter before connect-
ing it to the meter.

SPECIFICATIONS

Range pH
ORP
°C
Resolution pH
ORP
°C
Accuracy pH
ORP
(@20°C/68°F)
°C
pH Calibration
Temperature Automatic (with temperature probe) or
Compensation manual (adjustable with arrow keys)
pH Electrode HI 1110B combination pH electrode
with BNC and 1 m cable (included)
Temperature probe
Power supply
Environment
RH max 95% non-condensing
Dimensions 230 x 170 x 75 mm (9.1x6.7x 3")
Weight
-
0.00 to 14.00
±1999 mV (pH 21 only)
0.0 to 100.0
0.01
1 mV (pH 21 only)
0.1
±0.02
±2 mV (pH 21 only)
±1
Automatic, 1 or 2 point
HI 7662 (optional)
12 Vdc adapter (included)
0 to 50°C (32 to 122°F)
500 g (1.1 lb.)
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