AOIP CALYS 150, Инструкция по эксплуатации, Страница: 131 / 194

Measurement on channel V1
B
NTA47224-300A9 131 / 194
Modules With HART® Protocol
The HART® protocol (Highway-Addressable Remote Transducer) is a communications protocol over a direct current loop
(0-20 or 4-20mA). This protocol is used to without interfering with current measurement to both read measurements carried
out by the HART® transmitter and transmitter-related information (brand, reference, etc..), and also to adjust it.
The CALYS 150 with related HART® module (ACL500) is used to carry out all of these operations.
To use the CALYS 150 in HART mode, the unit must be connected to the current loop (across 24 V Out terminals from
channel V1) and be provided with the specific ACL500 modem (connected to the unit's side).
The calibrator provides the loop power supply via an internal 250
Ω series resistor.
When an external loop power supply is used, a resistor from 230
Ω to 270 Ω must be series connected with the external
loop power supply and transmitter.
To configure the CALYS 150 in this mode, "HART" function must be selected from "Menu":
Modem HART®
AOIP ACL500
HART® Transmitter
Probe
connection
4-20 mA link with loop power
supply and HART® resistor ON.
Connexion modem
HART®