Hach FL1500, Руководство пользователя

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Table 9 Relay wiring information
Connection Signal
NO Normally open
COM Common
NC Normally closed
Connect to the inputs and outputs
Connect a user-supplied device such as a PLC, recorder or third-party sensor to the analog input,
analog output, digital input or digital output terminal blocks. Use a minimum wire gauge of 24 AWG.
Make sure to obey the requirements for the input or output connection in
Specifications on page 3.
1. Remove the power to the instrument.
2. Open the access door. Refer to Open the access door on page 12.
3. Put the cable through a strain relief fitting.
4. Install each wire in the terminal block. Refer to Figure 13 on page 20 and the wiring information
for the applicable connection:
Option Description
Analog
input Connect a user-supplied device to the ANALOG INPUT terminal block. Refer to Table 10 . Do
not connect the shield at both ends of the cable. Use of non-shielded cable can cause radio
frequency emission or susceptibility levels that are higher than permitted.
Analog
output Connect a user-supplied device to the ANALOG OUTPUT terminal block. Refer to Table 11 . Do
not connect to a device that has applied voltage. Do not use the analog outputs to supply power
to a 2-wire (loop-powered) transmitter.
Digital
input Connect a user-supplied device to the DIGITAL INPUTS terminal block. Refer to Table 12 .
Digital
output Connect a user-supplied device such as a remote alarm indicator, buzzer or PLC to the
DIGITAL OUTPUTS terminal block. Refer to
Table 13 .
Do not use the digital outputs for process control functions. The digital output connections do
not replace a PLC (programmable logic controller).
The digital outputs are independent floating switches when the PULLUP V input and associated
internal pull-up resistors are not used. The switches are normally open. The switches close
when the user-selected alarm conditions occur.
To use the optional PULLUP V input and the related internal 10 kΩ internal pull-up resistors,
supply the applicable voltage to the PULLUP V and COM pins. Then, connect a jumper from
the OUT # LO pin to the COM pin. The output signal logic is active low.
5. Tighten the cable strain relief.
6. Install the access door.
Table 10 Analog input wiring information
Connection Signal
IN HI Positive (+)
IN LO Negative (–)
Table 11 Analog output wiring information
Connection Signal
OUT LO Negative (–)
OUT HI Positive (+)
OUT PWR Power
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