Hach AS950 Instalación Y Mantenimiento Básicos página 19

Pin Signal Color
5 Special Red
output
6 Program Green
Complete
output
7 Shield Silver
5.4.5 Connect a sensor
To connect a sensor (e.g., pH or flow sensor) to a sensor port, refer to
Figure 12 Connect a sensor
4
The wire color refers to the colors of multi-purpose cables (8528500 and 8528501).
Table 1 Half cable wiring information (continued)
4
Description
This output goes from 0 to
+12 VDC with respect to pin
2 after each sample cycle.
Refer to the Mode setting of
the hardware settings for the
AUX I/O port. Refer to the
AS950 operations
documentation.
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 has protection against short
circuit currents to pin 2. External load
current: 0.2 A maximum
Active high output: 15 VDC nominal
with AC power to the AS950 controller
or a 12 VDC nominal with battery
power to the AS950 controller.
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.
English 19