10
Model TA502A
External Relay Circuit
Clamping Diode
+
-
-
+
External Logic Interface
-
+
External Test Circuit
(TTL,CMOS,HTL)
Voltmeter
R
R
*
*
*
*
*
*
*
3 to 35VDC
3 to 35VDC
3 to 35VDC
NOTE:
Only one Field Transmitter may be connected to a Model TA502A. 4-conductor
cable is recommended if cable length is greater than 400 ft.
Figure 15 illustrates the inter-connections for the TA502A & various types of Field
Transmitters.
Figure 15: TA502A Inter-Connections
The electrical rating for all open collector outputs is 100 mA @ 35 VDC.
Figure 16 illustrates some typical open-collector external circuits.
Figure 16: External Test Circuits for Open Collectors
32
30
28
26
24
22
20
18
16
14
12
10
8
6
4
2
z
d
TA502A/4-20 mA Trans
+24V COM
+24Vdc
4-20 mA
TA502A/2-Wire Trans With External Power Supply
8
4-20 mA
COM
22
24
26
28
30
32
10
12
14
16
18
20
d
z
2
4
6
TA502A/2-Wire 4-20 mA Trans
4-20 mA
8
20
18
16
14
12
10
32
30
28
26
24
22
+24Vdc
6
4
2
d
z
Signal COM*
