Analog Output - Hanna Instruments HI700 Series Instruction Manual

ANALOG OUTPUT

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HI700221 and HI710221 models are provided with the analog output feature.
The output is isolated and can be a voltage or a current.
With the recorder, simply connect the common port to
the ground output and the second port to the current
output or voltage output (depending on which param-
eter is being used) as depicted aside.
The type (voltage or current) and the range of the output
analog signal is selectable through the jumpers on the power board.
Configurations of the switch are as follows:
Output Switch 1
0-5 VDC, 1-5 VDC
0-10 VDC
0-20 mA, 4-20 mA
0-1 mA
Choice between different ranges with the same configuration (for example 0-20 mA
and 4-20 mA) is achieved via software by entering the setup mode and selecting code
40 (see Setup Mode section for exact procedure).
Factory default is switches 1 and 3 closed (ON) and switches 2 and 4 open (OFF), i.e.
0-20 mA, 4-20 mA and 0-10 VDC.
In any case, contact the nearest Hanna Instruments Customer Service Center for changing
of the default configuration.
By default the minimum and maximum values of analog output correspond to the
minimum and maximum of the selected range of the meter. For example, for the
HI700221 with a selected 0 to 1999 µS range and analog output of 4-20 mA, the
default values are 0 and 1999 µS corresponding to 4 and 20 mA, respectively
output matching a different EC or TDS range, for example, 4 mA = 30 mS and
20 mA = 50 mS.
To change the default values, the setup mode must be entered. Setup codes for changing
the analog output minimum and maximum are 41 or 42, respectively. For the exact
procedure, refer to the setup mode section in the manual.
Switch 2
OFF ON
ON OFF
– – – –
– – – –
Switch 3 Switch 4
– – – –
– – – –
ON – –
OFF – –