SPRIANO SST70 - Page 16

OPERATING MANUAL
MN-SST70
ED-19-01
SPRIANO® TECHNOLOGIES - www.spriano.it – spriano@terranova-instruments.com
a TERRANOVA® Srl brand - www.terranova-instruments.com - VAT IT07848810151
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Pag. 16/52
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 10: operating area for Ex d protection
The electronic transmitters series SST70 are fully 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 primary measure;
 SV: % of the span;
 TV: analog output;
 FV: sensor temperature.
Please refer to Figure 11 for the 4÷20 mA + Hart® modem connection.
In Figure 12 the multidrop Hart® connection type is shown.
Vdc