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Note
The RS-485 barrier is not isolated.
Output(s) Isolator
4–20 mA + HART MTL5541
• Time Period Signal (TPS)
• Discrete
MTL5532
Modbus/RS-485 MTL7761AC
Power MTL5523
Procedure
1. Wire the isolators to the appropriate output terminal and pins.
Hazardous area output wiring using galvanic isolators (TPS and Discrete output options)Figure 3-3:
TPS/DO
mA1+
HART
RS-485
PWR
SIG
Hazardous Area
Non-Hazardous Area
MTL7761AC
MTL5532
RS-485 A
RS-485 B
5
3
4
1
2
1
11
12
13
14
4
1 kΩ
MTL5541
2
1
14
13
12
11
MTL5523
2
1
24 VDC
24 VDC
14
13
24 VDC
1 kΩ
250 Ω
A
B
HART
Device
Signal
Device
2. Set the isolator switch settings for the TPS/DO connection (MTL5532 isolator). You
must set the isolator switches appropriately for Pins 1 through 5 (see Table 1).
Wiring
30 Micro Motion
®
Gas Density Meters