Hanna Instruments HI 21 Series - Manual (Page 24)

47 46
• Press CFM to confirm the parameter that stops blinking on
the primary display. The secondary display shows the mul-
timeter or HI 931002 input value as the interval lower limit.
• Use or to make the HI
931002 or multimeter output cor-
respond with the value shown on
the secondary display (e.g. 4).
• Wait until the calibrator reading is stable (approx. 30 sec.).
• Press CFM to enter. The meter will switch to the second
calibration point. Repeat the above procedure.
• After the desired readings are obtained, press CFM and
the meter will skip back to normal operating mode.
Note When adjusting values using the or it is important to
allow for sufficient response time (up to 30 seconds)
The table below lists the values of output codes along with
the calibration values (which are the analog output mini-
mum and maximum) as indicated on the display.
The secondary display indicates the current calibration value,
while primary display indicates the current calibration type.
OUTPUT CALIBRATION CALIBRATION CALIBRATION
TYPE CODE POINT 1 POINT 2
0-1 mA 0 0 mA 1 mA
0-20 mA 1 0 mA 20 mA
4-20 mA 2 4 mA 20 mA
0-5 Vdc 3 0 Vdc 5 Vdc
1-5 Vdc 4 1 Vdc 5 Vdc
0-10 Vdc 5 0 Vdc 10 Vdc
• Immerse the temperature probe in
the second beaker as near to the
Checktemp as possible and repeat
the above procedure.
Calibration procedure may be interrupted by pressing CAL
again at any time. If the calibration procedure is stopped this
way, or if the controller is switched off before the last step, no
calibration data is stored in non-volatile memory (EEPROM).
ANALOG OUTPUT CALIBRATION
In the meters where the analog output is available, this fea-
ture is factory calibrated through software. The user may also
perform these calibration procedures.
IMPORTANT It is recommended to perform the output calibration at least
once a year. Calibration should only be performed after a
few minutes from power up.
• With a multimeter or an HI
931002 connect the common
port to the ground output and
the second port to the current
or voltage output (depending
on which parameter is being
calibrated).
• Press and hold in sequence CFM first, then and then
CAL to enter the Analog Output Calibration mode.
• Execute the password procedure.
• The primary display will show the current selected param-
eter blinking. Use the to select the code (0-5 see next
chart) for the desired parameter displayed on the second-
ary display (e.g. 4-20 mA).
50 °C
(122 °F)
°C