3-13
IM 2553A-01EN
Preparation
3
2
1
4
5
6
7
8
9
10
11
12
13
14
App
Index
Note
• Current sinking (absorption) is possible in any of the voltage or current ranges. For example, by absorbing
the current from a voltage source such as a distributor, the 2553A can simulate a load, like a two-wire
transmitter. For the maximum sink current, see “DC Voltage Sourcing” or “DC Current Sourcing” in section
2.1. Immediately after sinking current that exceeds 30 mA, errors exceeding the accuracy specifications
may occur due to the increased temperature inside the 2553A.
In the following example, the value is set to 20 mA and the polarity to negative.
HI
LO
Voltage source
(e.g., distributor)
4-20 mA
+
−
• When using a small output range, such as 10 mV or 100 mV, wind the copper wires directly to the output
terminals. If the output terminal temperature changes as a result of making contact with the lead wires,
crimping terminals, banana plugs, or other conductors during wiring or due to ambient air movement,
errors exceeding the accuracy specifications may occur when a small output range is used. In such
situations, wait until the output stabilizes.
Wiring a Thermograph to the Output Terminals
The fastening screws are M6. Wind the thermocouple wire or the RTD lead wire around the output
terminal screw, and then tighten the terminal knob firmly with your hand. The terminal or knob may
break if you apply excessive torque. For wiring examples, see also appendixes 2 and 3.
Wiring Example
2553A output
terminals
−
(B)
+(A)
Thermograph
Note
If the output terminal temperature changes as a result of making contact when wiring thermocouples,
compensating lead wires, and the like; making contact when connecting external RJ sensors; and due to
ambient air movement, errors exceeding the accuracy specifications may occur. In such situations, wait until
the output stabilizes.
3.6 Connecting Wires
