Splitter Interface - Hach Sigma 900 User Manual

Section 3
Liquid Level Actuator/
D Auxiliary Control
Input
E Special Output
F Program Complete
Figure 7 Wiring the Protection Diode in Parallel with the Coil
1. Relay 2.

3.2.1 Splitter Interface

Figure 8 Splitter Interface
Page 24
Using the Auxiliary Connection
This line is held at 5 V dc inside the sampler. When shorted to ground (Pin
B), a signal is sent to the microprocessor inside the sampler causing it to
"wake up" and begin or resume its sampling program. It can be used in
conjunction with a simple level float to actuate the sampler when liquid is
Black
present or to take over after a second sampler has finished its program. It
may also be used with any device (such as a pH meter) that produces a
dry contact output to control the sampler in response to some user-defined
condition (i.e. high or low pH); must be used in conjunction with Pin B.
Normally at 0 V dc, this line goes to 12 V dc upon any of the selected
events described in
Red
Note: Install a protection diode as shown in
sampler circuit during de-energizing of the relay circuit. Use an IN4004 or
equivalent diode.
Normally an open circuit, this line switches to ground for 90 seconds at the
conclusion of the sampling program. Used to "wake up" another sampler
to take over sampling or to signal an operator or data logger upon the
Green
completion of the sampling program. This pin is also used to signal the
bottle full condition in a single bottle/continuous mode, and will transmit
the bottle # to a 950 Flow Meter if the program complete signal is disabled.
5
4
3
Contacts 3. Pin B
Cable Required
Multi-Purpose Half Cable Assembly (Cat. No. 941): 10' long, 6-pin connector
on one end, tinned wire leads on the other end.
Multi-Purpose Full Cable Assembly (Cat. No. 940): 10' long, 6-pin connector
on both ends
Use the Splitter Interface (Cat. No. 939) when more than one of the signals
listed above are needed simultaneously. Connecting the interface to the 6-pin
connector on the sampler provides three additional connectors. Two or more
interfaces may be connected in series to allow for additional connections.
section 5.13.1 on page 47.
Figure 7
1
2
4. Protection Diode
24 V dc
(max)
@100 mA
(max)
N/A
in order to protect the
N/A
5. Pin E
8837ext.fm