Hanna Instruments HI 21 Series - Manual (Page 5)

9 8
INSTALLATION
HI 21 and HI 22 offer
a multitude of possibili-
ties, from single and
dual setpoints to ON/
OFF, proportional or
PID dosage, isolated
outputs with user-se-
lectable zoom,
bidirectional RS485, re-
corder outputs in
mAmps and Volts.
In addition, HI 21 and
HI 22 are both
equipped with the ex-
clusive differential
input.
In a system with poor
grounding, it is possible
to have a ground cur-
rent flowing through
the reference junction.
This can cause a rapid
degradation of the elec-
trode. The Hanna
differential input re-
duces the likelihood of
ground loops.
See the diagram for a
recommended installa-
tion.
SPECIFICATIONS HI 21 & HI 22
Range 0.00 to 14.00 pH (HI 21 Series only)
±2000 mV (HI 22 Series only)
-9.9 to 120.0 °C
Resolution 0.01 pH (HI 21 Series only)
1 mV (HI 22 Series only)
0.1 °C
Accuracy ±0.02 pH (HI 21 Series only)
(@20°C/68°F) ±2 mV (HI 22 Series only)
±0.5 °C
Typical EMC Deviation ±0.05 pH (HI 21 Series only)
±4 mV (HI 22 Series only)
±1.0 °C
Analog Output 0 to 1 mA, 0 to 20 mA, 4 to 20 mA
0 to 5 Vdc, 1 to 5 Vdc, 0 to 10 Vdc
Digital Output RS485
Power Supply Input ±5V (for amplified electrodes)
Power Supply “-1” models: 115 ±10% Vac, 50/60 Hz
“-2” models: 230 ±10% Vac, 50/60 Hz
Power Consumption 15 VA
Over Current Protection 400 mA, 250V, FAST FUSE
Relays 1 and 2 Electromechanical relay SPDT contact outputs,
5A-250 Vac, 5A - 30 Vdc (resistive load)
(HI 211YZ, HI 212YZ and HI 221YZ)
Fuse protected: 5A, 250V FAST FUSE
Alarm Relay Electromechanical relay SPDT contact output,
5A - 250 Vac, 5A - 30 Vdc (resistive load)
Fuse protected: 5A, 250V FAST FUSE
Environment 0 to 50°C (32 to 122°F);
RH max 85% non-condensing
Protection IP 54
Dimensions 221 x 181 x 86 mm (8.7 x 7.1 x 3.4’’)
Weight approximately 1.4 kg (3.1 lb.)