IS-HF-AccUViewLEDEx-100125 Rev 0
7
4-20 mA
The 4-20 mA output is driven by a 15 VDC power source and can drive
recorder loads up to 600 ohms.
Do not run 4-20 mA cables in the
same conduit as power.
Operation of this output is covered in the
Setting the 4-20 mA section. The outputs are equipped standard with
an installed loop powered isolator (500V isolation).
For ease of connecting, remove the plug-in DIN rail mount connector.
Polarity of the connections is labeled next to this connector.
Commissioning and Start-Up
1. Once all water, air and electrical connections have been made, turn
on power to the Air Sentinel III.
2. The Air Sentinel III will run through an automatic seven-minute purge
cycle.
3. Once the purge cycle is complete, power will then be supplied to
the AccUView LED Ex.
If at any time there is a loss of pressurization in the electrical enclosure,
the Air Sentinel III will remove power to the AccUView LED Ex.
Air Sentinel III LED Lamp Indicators
Lamp Color Matrix
Operation
Power to
AccUView LED Ex
Condition
All Lamps
GREEN
Safe Operation
ON
Normal Operation
Timer Lamp
RED
Instrument is
Purging
OFF
If pressure lamp is green,
the instrument is purging.
Pressure Lamp
RED
Unsafe Operation,
Low Pressure
OFF
Insufficient Air Pressure
By Pass Lamp
RED
Unsafe Operation
ON
By-Pass key enabled
NO lamps
No power out
applied
OFF
No power applied to Air
Sentinel III
The AccUView LED Ex is ready for operation when the Air Sentinel III
displays all green LED lamps.
Power
It is recommended that a circuit breaker be placed in a safe area prior
to the power connection to allow for service. Mains connection should
only be made to the Air Sentinel III. See Side View image above for
gland selection.
The AccUView LED Ex is not supplied with a
power cord.
The Air Sentinel III purge controller requires 100-240 VAC 47-63 Hz.
A circuit breaker must be placed prior to the power connection in close
proximity and within easy reach to allow for service. This circuit breaker
must be marked to indicate that it is a disconnecting means for the
instrument. The rating of the circuit should be 5A.
Supply power connections are made ONLY to top “MAINS” connection
on the back of the Air Sentinel III purge controller:
Terminal 3: Earth Ground
Terminal 2: Neutral
Terminal 1: Line or Hot
Suitable wire would be stranded, 3
conductors 18-12 AWG copper or tin
plated copper with a voltage rating of
600 VAC with a temperature rating of
90°C or higher.
Common earth bond points are
provided both inside the enclosure
on the chassis and outside of the
enclosure. This terminal set can be removed for easier connections.
Please ensure this terminal set is properly tightened using the two side
screws.
RS-485
The RS-485 Modbus or special protocol half-duplex (2-
wire) digital interface operates with differential levels that
are less susceptible to electrical interferences. This is why
cable lengths up to 3000 feet can be implemented. The
last device on each bus may require terminating with a
120-ohm resistor to eliminate signal reflection on the line.
DO NOT run RS-485 cables in the same conduit as
power.
For ease of connecting, remove the plug-in DIN rail mount
connector. Connections are labeled next to this connector.
The instrument can accept 100-240 VAC, 47-63 Hz. Verify that
the mains voltage falls within these specifications.
DANGER
!
To prevent damage to the instrument, ensure that power is
disconnected prior to making connections.
NOTICE
To prevent damage to the instrument, ensure that power is
disconnected prior to making connections.
NOTICE
A by-pass key is provided for operating the AccUView LED Ex
with the enclosure open. This is an unsafe operating condition.
It is very important that the operator checks the operating
atmosphere and determines that it is safe, before opening the
enclosure. This is intended as a temporary operating condition.
Do not operate the Air Sentinel for long periods of time in the
bypass mode. This is intended only for maintenance operations.
Do not operate the Air Sentinel in bypass mode unattended.
DANGER
!
Back-Pressure Clamp
Outlet
Connection
Junction Box
Inlet
Connection
Flow Switch
Pressure
Regulator
Inlet Clamp
Instrument
Cable
Modbus / 4-20
Output Terminal
Only qualified electricians should be allowed to perform the
installation of the instrument as it involves a line voltage that
could endanger life.
DANGER
!
