Hach AS950 Instalación Y Mantenimiento Básicos página 17

Pin Signal Color
1 +12 VDC White
power
output
2 Common Blue
3 Pulse input Orange This input is a sample collection
or Analog
input
4 Liquid level Black
input or
Auxiliary
control
input
5 Special Red
output
4
The wire color refers to the colors of multi-purpose cables (8528500 and 8528501).
5
All mains powered equipment that connects to the controller terminals must be NRTL listed.
6
Long-term operation in this state voids the warranty.
7
Source impedance of the driving signal must be less than 5 kΩ.
Table 1 Half cable wiring information
4
Description
Power supply positive output.
Only use with pin 2.
Negative return of power supply.
When the power supply is used,
pin 2 is connected to earth
5
ground .
trigger from the flow meter (pulse
or 4–20 mA) or a simple floating
(dry) contact closure.
Liquid level input—Start or
continue the sampling program. A
simple float level switch can
supply input.
Auxiliary control input—Start a
sampler after the sampling
program on another sampler
ends. As an alternative, start a
sampler when a trigger condition
occurs. For example, when a
high or low pH condition occurs,
the sampling program starts.
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.
Rating
Battery power to the IO9000 module: 12 VDC
nominal; Power supply to the IO9000 module:
15 at 1.0 A maximum.
Pulse input—Reacts to a positive pulse with
respect to pin 2. Termination (pulled low): pin 2
through a series 1 kΩ resistor and 10 kΩ
resistor. A 7.5 zener diode is in parallel with the
10 kΩ resistor as a protection device.
Analog input—Reacts to the analog signal that
enters pin 3 and returns on pin 2. Input burden:
100 Ω plus 0.4 V; Input current (internal limit):
6
40 to 50 mA maximum
Absolute maximum input: 0 to 15 VDC with
respect to pin 2.
Signal to make the input active: 5 to 15 V
7
positive-going pulse with respect to pin 2,
50 millisecond minimum.
Termination (pulled high): internal +5 V supply
through an 11 kΩ resistance with a series 1 kΩ
resistor and 7.5 V zener diode terminated to pin
2 for protection. Trigger: High to low voltage
with a low pulse of 50 milliseconds minimum.
Absolute maximum input: 0 to 15 VDC with
respect to pin 2. Signal to make the input
active: external logic signal with 5 to 15 VDC
power source. The drive signal must be
typically high. The external driver must be able
to sink 0.5 mA at 1 VDC maximum at the logic
low level.
A logic high signal from a driver with a power
source of more than 7.5 V will source current
into this input at the rate of: I = (V –
7.5)/1000 where I is the source current and V is
the power supply voltage of the driving logic.
Dry contact (switch) closure: 50 millisecond
minimum between pin 4 and pin 2. Contact
resistance: 2 kΩ maximum. Contact current:
0.5 mA DC maximum
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.
English 17