Honeywell Mercury User Manual page 47

Installation in Division 2 Hazardous
Locations
Notes
UL, Mercury Instruments Drawing # 40-2139-A
1. Installation shall be in accordance with the National Electric
Code ANSI/NFPA 70, Article 501-4b.
2. Power Options:
Use one or two lithium battery packs, 40-1447
OR one or two alkaline battery packs, 40-1595 or 40-1865
OR Mercury DC Power Supply, 40-1775 with optional backup
from either internal AA cell battery pack or separate alkaline
battery pack, 40-1595 or 40-1865
OR remote DC power source, class 2 only, nine volts nominal,
with optional backup from an alkaline battery pack, 40-1595
or 40-1865
3. J3 & J4 are interchangeable DC input power connectors.
Connect primary and optional backup plug to either connector.
4. Circuits are non-incendive when remote instruments are
Mercury Instrument models:
a) Mercor ECAT or
b) Mercor Mini or
c) Electronic Recorder Model ER
5. Always connect instrument Rx to Modem Tx and instrument
Tx to Modem Rx.
Page 47
47