Hanna Instruments HI 8001, Installation Manual

4

1.2 INPUTS

1.2 INPUTS

1.2 INPUTS

1.2 INPUTS

1.2 INPUTS-----OUTPUTS DESCRIPTION

OUTPUTS DESCRIPTION

OUTPUTS DESCRIPTION

OUTPUTS DESCRIPTION

OUTPUTS DESCRIPTION

1.2.1 Analog Inputs

1.2.1 Analog Inputs

1.2.1 Analog Inputs

1.2.1 Analog Inputs

1.2.1 Analog Inputs

The main board of HI 8001 and HI 8002 controllers  have on the right side eight inputs dedicated for
the standard analog signals: seven of the 4-20mA type and one of the 0-2V type.
The transmitters have to be connected between the pH, the conductivity sensors and the controller.
They can be supplied from the controller outputs (Vs 12VDC) if the consumption doesn’t exceed 250mA.
These inputs use the transmitters that have source current output type.
The Hanna transmitter code that can be used is HI98143-20 (one EC and one pH channel). When the
user has other Hanna transmitter types it can modify them to the HI98143-20. For modifications
contact the closer Hanna Instruments representative.

1.2.2 Digital Inputs

1.2.2 Digital Inputs

1.2.2 Digital Inputs

1.2.2 Digital Inputs

1.2.2 Digital Inputs

On the main board, near the analog inputs, the controller has 16 digital inputs with optical separa-
tion. They are available only when the IN24Vac input is supplied with 24Vdc (min. 150mA). The
sensors have to be of switch type and connected to the COM IN pins, near the last digital input.
When between a digital input and the COM IN pin a switch ON is connected , that input is considered
as inactive. Otherwise, when the switch is open or the 24Vac supply is not present that digital input is
active.  When the power supply is not present this solution detects and generates the alarm conditions.
The digital inputs assigned to the sensors of the external tank  are used to generate a start condition
for the programs (if this setting has been done). In this case the program is started when the switch is
ON (closed).

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