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Special Instructions for Class I, Division 2 Hazardous Locations
1.
Bristol, Inc.'s ControlWave EFM Electronic Flow Meter is listed by Underwriters Laboratories (UL) as
nonincendive and is suitable for use in Class I, Division 2, Group C and D hazardous locations or
nonhazardous locations only. Read this document carefully before installing a nonincendive
ControlWave EFM Electronic Flow Meter. Refer to the ControlWave EFMs Electronic Flow Meter
User's Manual for general information. In the event of a conflict between the ControlWave EFM
Electronic Flow Meter User's Manual and this document, always follow the instructions in this document.
2.
The ControlWave EFM Electronic Flow Meter includes both nonincendive and unrated field circuits.
Unless a circuit is specifically identified in this document as nonincendive, the circuit is unrated. Unrated
circuits must be wired using Div. 2 wiring methods as specified in article 501-4(b) of the National
Electrical Code (NEC), NFPA 70 for installations in the United States, or as specified in Section 18-152 of
the Canadian Electrical Code for installation in Canada.
3.
The local communications port terminates in a D-Type connector on the bottom of the ControlWave
EFM Electronic Flow Meter enclosure. The wiring on this connector is unrated. No connections may be
made to this port unless the user ensures that the area is known to be nonhazardous. Connections to this
port are temporary, and must be short in duration to ensure that flammable concentrations do not
accumulate while it is in use.
4.
The optional power system (solar panel and battery) approved for use with the nonincendive Control-
Wave EFM Electronic Flow Meter are described in the Model Specification. The connection to the solar
panel is approved as a nonincendive circuit so that Division 2 wiring methods are not required. The
nominal panel voltage must match the nominal battery voltage (12V).
5.
WARNING: EXPLOSION HAZARD - Do Not disconnect Solar Power from the Battery or any
other power connections within the ControlWave EFM Enclosure (including con-nectors TB1
through TB6 on the Power Distribution Board, connector TB1 on the System Controller
Module, any power connections to optional items such as radio, modem, Digital to Relay I/O
Board, 21V Power Supply Board, or cabling to the Display/Keypad unless the area is known to
be nonhazardous.
6.
WARNING: EXPLOSION HAZARD - Substitution of major components may impair suitability
for use in Class I, Division 2 environments.
7.
WARNING: EXPLOSION HAZARD - The area must be known to be nonhazardous before
servicing/replacing the unit and before installing or removing I/O wiring.
8.
WARNING: EXPLOSION HAZARD - Do Not disconnect equipment unless power has been
disconnected and the area is known to be nonhazardous.
9.
An RTD is normally supplied with the ControlWave EFM. Connection to the RTD is approved as a
nonincendive circuit, so that Division 2 wiring methods are not required.
10.
Signal connectors available for customer wiring are listed in Table A1. I/O Connections are unrated and
must be wired using Div. 2 wiring methods.
11.
The UL listed nonincendive ControlWave EFM may include radio/modem communications (listed on
Model Spec.) that is used in conjunction with a 30W Solar Panel and 12V, 33AH Lead Acid Battery
System. Connection to the radio or modem is approved as a nonincendive circuit, so that Division 2 wiring
methods are not required.
12.
The UL Listed nonincendive ControlWave EFM may include a Digital To Relay I/O Board (option). No
field wiring connections/removals should be made at the Digital To Relay I/O Board unless the area is
known to be nonhazardous. Digital To Relay I/O Board I/O circuitry is unrated and must be wired using
Div. 2 wiring methods.
13.
The UL Listed nonincendive ControlWave EFM may include a 21V Power Supply Board (option). No
field wiring connections/removals should be made at the 21V Power Supply Board unless the area is
known to be nonhazardous. 21V Power Supply Board Transmitter Interface circuitry is unrated and must
be wired using Div. 2 wiring methods.
Table A1 -Module/Board Connector Customer Wiring Connectors
Module/Item
CPU Module
CPU Module
SCM Module
SCM Module
10/06/2006
ControlWave EFM
Connector
J3 - COM1, 9-pin Male D-sub
J4 - COM2, 9-pin Male D-sub
RS-232
J5 - COM3, 9-pin Male D-sub
RS-485
J2 - Display Intf. RJ-45 Female
P2 - MVT Intf.
Appendix A, Document CI-ControlWave EFM
Wiring Notes
Factory Connected to Local Comm. Port. Refer
to ¶ 3 of this document.
Remote Comm. Port: For Radio or external
Network Comm. Refer to Model Spec. and ¶ 10
of this document. When used for Network
Comm., use Div. 2 wiring methods. If COM2 is
used in conjunction with a radio/modem refer
to 11 of this document.
Factory Wired - *
Factory Wired - *
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