16
Figure 9.
0–10 Volt Analog Outputs:
The IR-SNIF-
MCD monitor provides two 0–10 volt analog
outputs. Analog 1 provides a signal
proportional to 0-1000 ppm indicating the
current ppm level. Analog 2 provides a
signal proportional to the area being
measured, based on 0-10 volts proportional
to 0 to 32 areas. For simple installations
this signal will not normally be used. For
applications where the IR-SNIF-MCD is
installed inside a mechanical room, the
analog 1 signal can be used to drive an
optional remote analog display at the
entrance to the room. This signal could be
used to provide an analog input to building
management
systems
for
remote
monitoring of the ppm level and for trending
of levels. This signal should NOT be used
as a replacement for discrete alarm relay
connections to a BMS. Analog output
connections are as follows:
1. Use twisted pair wire for analog 1
connection, or four conductor twisted
wire for both analog 1 and analog 2.
Typical low voltage solid conductor
wire is suitable for this signal.
Shielded cable is preferred, but not
always required.
2. Route twisted pair wire into the
monitor and along the wire harness
from the back-plate to the TB3 on
the back-plate. Secure the twisted
pair periodically to the wire harness
using tie wraps.
3. Connect the appropriate wires to
TB3-1, analog 1 plus, and TB3-3,
reference ground.
4. Connect the appropriate wires to
TB3-2, analog 2 plus, and TB3-3,
reference ground.
4–20 mA Optional Analog Outputs:
The
IR-SNIF-MCD monitor provides a optional
4–20 mA analog outputs in place of the
standard 0-10 volt analog outputs. To
identify whether a monitor has 4-20 mA
analog output installed, examine the control
board installed on the door of the monitor.
Locate the chip sockets labeled U13 and
U14. U13 and U14 are located in the
center of the board, approximately 3.5
inches and 2 inches from the bottom of the
board. If the monitor is configured for the
standard 0-10 volt analog outputs, the
sockets will be empty. If configured for 4-
20 mA outputs, the sockets will have 4-20
mA drive chips installed. Connection to the
4-20 mA outputs is the same as for 0-10
volt outputs.
RS-485 Optional Serial Output:
The IR-
SNIF-MCD monitor provides an optional
RS-485 interface for use with ACC 070
SenTech COMM LINK PC to Refrigerant
Monitor Interface, or ACC 065 SenTech
Remote Control Panel Interface.
This interface provides the ability to display
the refrigerant levels in each area and
modify setpoints via a pc based interface.
Used in conjunction with the ACC 070
COMM LINK, the interface allows for
complete remote monitoring of multiple
refrigerant monitors in the same facility.
This interface also provides the ability to
display the refrigerant levels in each area
and modify setpoints via a digital remote
Содержание IR-SNIF-MC-1
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