ADS Environmental Services Model 3600 530002 A2 - Manual (Page 23)

2-8 ADS 3600 Flow Monitor O&M Manual
External Power Source
Some model 3600 flow monitors may require a continuous power source, for example
real time flow monitors used in SCADA applications. The external modem unit
(EMU) supplied for SCADA applications has a provision for continuous power from
an external power source. This can be accomplished in two ways: alternating current
(AC) or direct current (DC).
Note: For continuously powered applications, the external power cable within
the monitor must be moved from a non-functioning connector and placed into
connector P1, which is the connector to which the battery is normally
connected. Additionally, the battery should be removed from the flow monitor
housing.
Due to the diversity of electronics and telecommunications requirements abroad, ADS
only manufactures SCADA EMUs to meet the specific requirements of the United
States. United States versions of external-powered SCADA EMUs are available with
a modem. However, International versions of external-powered SCADA EMUs are
available without a modem. The user of an International version is responsible for
configuring the unit with any telecommunication options and for obtaining any agency
approvals for telecommunication equipment relevant to that country. ADS currently
manufactures the following SCADA EMUs:
ADS Part Number SCADA EMU Model
P/N 106328A International, External AC-Powered
P/N 106328B International, External DC-Powered
P/N 106328E United States, External AC-Powered
P/N 106328F United States, External DC-Powered
External AC Power Source (optional)
ADS can provide a cable assembly which includes a wall socket mount transformer to
provide the low voltage power needed by the EMU. In this version of the EMU, the
low voltage power sent to the EMU is used to operate and power the 3600 flow
monitor, sensors, modem, and EMU and to charge an internal NiCad battery. The
only SCADA EMU external AC power cable currently available through ADS is the
United States version with the following part number:
ADS Part Number External AC Power Cable
P/N 106330C United States
The above cable is 20 m (8 ft) in length. A wall receptacle or socket must be provided
within 20 m (8 ft) of the EMU location. A 25 m (10 ft) ground wire is also provided
in this cable to provide earth ground for the intrinsic safety barriers inside the EMU.
Earth grounding is necessary to satisfy the intrinsic safety requirements of an
installation involving a 3600 and SCADA EMU using external power. Therefore,