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Hazardous area output wiring using galvanic isolators (mA outputs option)Figure 3-2:
mA1+
HART
RS-485
PWR
mA2
Hazardous Area
Non-Hazardous Area
MTL7761AC
RS-485 A
RS-485 B
3
4
1
2
MTL5541
2
1
14
13
12
11
MTL5523
2
1
24 VDC
14
13
12
11
24 VDC
LINK
250 Ω
MTL5541
2
1
14
13
12
11
24 VDC
250 Ω
A
B
HART
Device
Signal
Device
3.2.4 Wire Time Period Signal (TPS) or Discrete output options
using galvanic isolators
Micro Motion provides a galvanic isolator installation kit specific to wiring the Time Period
Signal (TPS) and Discrete versions of the meter in a hazardous area. Contact your local
sales representative or Micro Motion Customer Support at flow.support@emerson.com for
more information on ordering an isolator kit for your meter.
CAUTION!
• Meter installation and wiring should be performed by suitably trained personnel only in
accordance with the applicable code of practice.
• Refer to the hazardous area approvals documentation shipped with your meter. Safety
instructions are available on the Micro Motion Product Documentation DVD and
accessible on the Micro Motion website at www.micromotion.com.
The galvanic isolator kit (TPS/Discrete version) provides isolators for connecting the
following outputs. Use the provided isolators with the designated output.
Wiring
Installation Manual 29