User’s Manual
Rev1.0
Date:15/07/2015 User’s Manual
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3.1.3 Wiringfor 3-wire HART@4~20mA
V-
B
A
I+ I-
P+ P+
V+
24V DC
Picture 3.4 Wiring of TGF450 4-wire HART@4~20mA
3.1.4 Wiring for RS485
V-
B
A
I+ I-
P+ P+
V+
Picture 3.5 Wiring of TGF450 RS485
3.2 Shell grounding and elimination of interference
In TGF450 thermal mass flowmeter the power supply of signal processing circuit is transferred from
outside power supply by a isolation type DC-DC transmitter with advanced grounding technology . The
field frequency interference can be isolated well.
When using this product , the “V-” of power supplier should not be connected with the ground .When
this product is used in a environment with strong interference , the shell should be clean connected with
earth through cable , so the interference can be eliminated .
3.4 Requirement on wiring
1) Please do not conduct wiring when the power is on in a explosive environment.
2) Please open the rear cover first, then inert the cable into back zone of housing thourgh the
water-proof cable gland.
