Startup - Hach AS950 Basic Installation And Maintenance

Pin Signal Color
6 Program Green
Complete
output
7 Shield Silver
Connect a sensor
To connect a sensor (e.g., pH or flow sensor) to a sensor port, refer to
Figure 12 Connect a sensor

Startup

Set the instrument to on
The refrigerator starts after a 5-minute delay when power is supplied to the sampler. The refrigerator
continues to operate when the controller is set to off or the power is removed from the controller.
Push the POWER key on the controller to set the controller to on.
To set the refrigerator to off, push the POWER key on the controller. Then, disconnect the power
cord on the AWRS or the two power cords on the refrigerated sampler.
Preparation for use
The physical installation is now complete. Refer to the operations manual to complete the setup for
the first use.
18 English
Table 1 Half cable wiring information (continued)
4
Description
Typical state: open circuit. This
output goes to ground for
90 seconds at the end of the
sampling program.
Use this output to start another
sampler or to signal an operator
or data logger at the end of the
sampling program.
The shield is a connection to
earth ground when AC power is
supplied to a sampler to control
RF emissions and susceptibility
to RF emissions.
Rating
This output is an open drain output with 18 V
zener clamp diode for over-voltage protection.
The output is active low with respect to pin 2.
Absolute maximum ratings for the output
transistor: sink current = 200 mA DC maximum;
external pull-up voltage = 18 VDC maximum
The shield is not a safety ground. Do not use
the shield as a current carrying conductor.
The shield wire of cables that are connected to
the AUX I/O port and are more than 3 m (10 ft)
should connected to pin 7.
Only connect the shield wire to earth ground at
one end of the cable to prevent ground loop
currents.
Figure 12.