Fisher-Rosemount 3095FT, Manual

Page: 32 / 184

Rosemount Model 3095FT HART Flow Transmitter
2-20
7. Install Grounds 7. Install field wiring ground (optional), and ground the transmitter
case (required).
Field Wiring Ground a.Field wiring may be grounded at any one point on the signal
loop, or it may be left ungrounded. The negative terminal of the
power supply is a recommended grounding point.
Ground the
Transmitter Case
b.The transmitter case should always be grounded in accordance
with national and local electrical codes. The most effective
transmitter case grounding method is direct connection to earth
ground with minimal impedance. Methods for grounding the
transmitter case include:
• External Ground Assembly : This assembly is included with the
transient protection terminal block. The External Ground
Assembly can also be ordered as a spare part (03031-0398-0001).
•
Internal Ground Connection
: Inside the FIELD TERMINALS
side of the electronics housing is the Internal Ground Connection
screw. This screw is identified by a ground symbol:
.
NOTE
The transient protection terminal block does not provide transient
protection unless the transmitter case is properly grounded. Use the
above guidelines to ground the transmitter case.
Do not run the transient protection ground wire with field wiring as the
ground wire may carry excessive current if a lighting strike occurs.
Grounding the transmitter case via threaded conduit connection may
not provide sufficient ground.
8. Field Calibration 8. After completing the installation, the Model 3095FT can be field
calibrated to correct for mounting position effects using the Model
3095FT User Interface Software.
a.Establish communications (see page 4-4)
b.Enter either the system administrator or a maintenance level
password.
c. Place the transmitter into Off-line or On-line Maintenance.
d.Perform a Trim DP Offset (zero).
e. (Optional) If a barometer that is four times as accurate as the
Model 3095FT AP sensor is available, perform an AP Offset.
9. Replace Cover
9. Replace the cover.
Explosions can cause death or serious injury. Both
transmitter covers must be fully engaged to meet explosion-
proof requirements.