transmitter is calculated according to 24V DC. The maximum output current of the meter is 22.5mA, the minimum working voltage is 10.5V DC, and the load is 600 ohms.
For flameproof transmitters, as long as the sum of the wire resistance and the device resistance of the transmitter belt does not exceed 600 ohms, the transmission distance of the wire is not limited.
However, the length of the wire is specified for an Ininsically Safe transmitter. Indirect safety is a system, not just a single instrument, but also related to the associated equipment and external wiring. The associated equipment is generally a safety barrier, which requires the length of the wire. The maximum allowable inductance and the maximum allowable capacitance are generally marked on the safety barrier. If the distributed capacitance and inductance of the wires plus the unprotected inductance and capacitance of the transmitter exceed the specified limits, the instrumentation system is not initally safe.