SPRIANO SST50 - Page 15

OPERATING MANUAL
MN-SST50
ED-17-09
SPRIANO® TECHNOLOGIES - www.spriano.it – spriano@terranova-instruments.com
a TERRANOVA® Srl brand - www.terranova-instruments.com - VAT IT07848810151
Factory & Sales: Via Gramsci 1 – 26827 Terranova dei Passerini (LO) – Italy
Head Office: Via Rosso Medardo 16 – 20159 Milano – Italy Ph: +39 0377 919119 – Fax: +39 0377 855720
Pag. 15/48
MANDATORY!
In order to obtain a 4÷20 mA + Hart® output a minimum load of 250 Ohm is
required.
TAG
-
1
2
3
4
Vdc
12.5
17.4
24
25.2
30
Ohm
23
250
558
615
837
Figure 9: operating area for Ex ia protection
The electronic transmitters totally comply with the HART® protocol specification Revision 6.0,
so they include remote process variable interrogation, parameter setting and diagnostics.
The device is a 4÷20mA 2-wire transmitter, with FSK communication.
It is possible to read via HART® the following variables:
 PV: transmitter main measure;
 SV: % of the span;
 TV: analog output.
 QV: instrument temperature.
Please refer to Figure 10 for the 4÷20 mA + Hart® modem connection.
In Figure 11 the multidrop Hart® connection type is shown.
It is possible to purchase the Hart Server as an additional product; this is a software including all
the interrogation, configuration and diagnostics functions required by the Hart® 6.0
specifications.