Catálogo Hanna Instruments V31

755 / 836

Specifications HI9931
Range 0.00 to 10.00 mS/cm
Resolution 0.01 mS/cm
Accuracy ±2% f.s.
Calibration through “ZERO CAL” and “SLOPE CAL” trimmers
Set point from 0 to 10.00 mS/cm
Temperature
Compensation automatic, 0 to 50°C (32 to 122°F) with β= 2%/°C
Recorder Output selectable at 0-20 mA or 4-20 mA (isolated)
Proportional Control conductivity from 0.0 to 1.6 mS/cm and time cycle from 0 to 90 seconds
Alarm Contact
terminal can be configured as normally open or normally closed (isolated output
max. 2A, max. 240V, resistive load, 1,000,000 strokes). The alarm is activated if
conductivity exceeds by more than the user selectable interval (0 to 2.0 mS/cm)
from the set point or due to overdosage
Dosing Terminals relay (115 to 240V, max.2A, 1,000,000 strokes) is activated whenever conductivity
falls below the setpoint
Probe four-ring potentiometric with built-in temperature sensor and DIN connector
(not included)
Power Supply ±10% 115 VAC or 230 VAC; 50/60 Hz
Environment -10 to 50°C (14 to 122°F); RH max 95% non-condensing
Case Materials fiber-reinforced, self-extinguishing ABS
Dimensions 221 x 181 x 86 mm (8.7 x 7.1 x 3.4’’)
Weight 1.6 kg (3.5 lb.)
Ordering
Information
HI9931 is supplied complete with instructions.
Choose your configuration
HI9931-1 115V
HI9931-2 230V
HI9931
Industrial Grade EC
Controller
with Proportional Fertilizer Dosing for
Hydroponics Applications
• Alarm
· · Fail Safe Alarm System
• ATC
· · Automatic temperature compensation
HI9931 is a wall mounted meter that
measures and controls conductivity in the
0 to 10 mS/cm range. A single set point
allows for proportional dosage of fertilizer
solutions. The proportional settings can
be fine tuned through two conveniently
positioned dials on the front panel. The time
cycle is adjustable from 0 to 90 seconds and
the proportional band from 0 to 1.6 mS/cm.
Calibration and set points have a coarse and
fine tuning trimmers. A pump or electrovalve
can be wired directly to the controller and be
powered through the terminals.
HI9931 also provides for an alarm relay which
is activated when the measurements exceed
the set point by a user selectable margin from
0.5 to 2.5 mS/cm. The alarm also triggers if,
due to a malfunction, the continuous dosing
time exceeds the operator adjustable period
of 1 to 10minutes. The alarmcanbe configured
in either normally closed or open position and
turned off during maintenance. HI9931 also
provides an isolated output signal which is
user selectable between 0-20 or 4-20 mA.
Hanna four-ring conductivity probes ending
in a DIN connector can be quickly attached
to the HI9931. Readings are automatically
compensated for the effects of temperature
in the 0 to 50°C (32 to 122°F) range. For
quick and easy wiring, HI9931 comes with
extractable terminal modules. Several LED’s
show whether the set point or alarm relays
have been activated.
EC solutions begin on page 5.34
16
Process Instrumentation
16.69 |
controllers