The TC-AT simulated thermocouple input isolator is a temperature transmitter which
converts the field thermocouple millivolt resistance value into standard current. Analog
circuits are fully adopted. The simulated thermocouple temperature transmitter has the
advantages of no resolution error or sample period error. It is also possesses high reliability
and no dead halt risk. Amongst all the TC serial products, if the simulated temperature
transmitter is used to replace the universal signal isolator with a CPU, this series of
products can be used to form a channel instrument system in full simulation. As relevant
products of the control system are formed by a single CPU, it is hard to achieve functional
safety. Therefore, the simulated temperature transmitter is used as a functional safety
alternative solution to achieve and enhance the reliability and safety of the system.
The typical value accuracy is ±0.1% FS. Ex-factory index: ±0.15% FS; the circuit method
of current positive feedback is adopted to achieve linearity correction. Calculation is
completed by Yutong Series R System Control Software 1.1. The calculation accuracy is
±0.03% FS in general.
Thermocouple graduation and ranges in common use are listed in the column of “model
and model selection & ordering”. It is suggested that the ranges listed for shortening the
supply time and reducing the cost be selected. As for special graduations and ranges
excluded in the scope, the intelligent TC-TP universal signal intrinsically safe isolator can be
used instead. If the single range is large, further discussion is required.
Cold junction compensation error: ≤ ±1 ℃.
Output signals 4~20mA can be extended to 0~20 mA.
Output self-adaptive load: 0~800 Ω. High limit of the output current is 25 mA. Load change
error < ±2 μA/800 Ω; impact of load open circuit on the other output < ±2 μA .
The power supply range can be chosen from within range of 20~42VDC or 15~42VDC.
See the “Technical Data Sheet” in the specifications for current consumption or other
functional indices.
There is no power light on the instrument panel. The power supply indicator is replaced by
a model printed on the instrument panel. After the power is on, the model on the panel
becomes illuminated by means of the LED backlight.
Clamping type structure, a 35 mm DIN standard guide rail clamping type installation is
used. Screw terminal, the wire is connected and fastened by M3 screws.
■ Model, model selection and ordering
Model selection example
Example 1. TC-AT13-TA-V1 K，0~1000……1-input & 3-output，Thermocouple converter（K, 0~1000℃ input, 4~20mA output , terminal power supply 20~42VDC）
Example 2. TC-AT11-ZA-V2 W，0~2200……1-input & 1-output，Thermocouple converter（W, 0~2200℃ input, 4~20mA output , guide rail power supply 20~42VDC）
Note: if you select products with guide rail power supply, please order the special power supply DIN guide rail as well.
Optional accessories: Special power supply DIN guide rail (1 m/pc) PSDR-9000
■ Block diagram/wiring diagram
