OPERATING MANUAL
MN-SST77B
ED-18-01
SPRIANO® TECHNOLOGIES
- www.spriano.it – [email protected]
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
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DESCRIPTION
SST77B series SMART differential pressure transmitters are microprocessor-based instruments
that combine the analog signal advantages (4-20mA) together with the flexibility of digital
communication using HART® protocol. They can be remotely configured by a universal hand
held terminal (HHT) or by a PC with a dedicated interface.
Moreover, it is possible to locally configure the instruments (zero and span) by means of 4
pushbuttons and to display the data on the wide LCD display.
The SST77B transmitters measure differential pressure with spans from 1,2 to 20000 mbar with a
static pressure up to 200 bar. The pressure measuring element is a piezoresistive sensor. It is
possible to choose a variety of sensors to satisfy all process conditions.
The
SPRIANO®
measuring cell contains the sensor and transmits pressure to the electronics.
Thermal drift is compensated using the temperature signal generated by a PTC thermistor
integrated in the sensor itself. Based on these readings the microprocessor generates the 4-20
mA analog output two wires system and displays the pressure measurement on the LCD.
Some of the main characteristics of this microprocessor-based transmitter, are:
- Wide rangeability.
- Automatic temperature compensation.
- Digital communication using HART® protocol.
NOM RANGE
[mbar]
SPAN
MIN/MAX [mbar]
RANGE LIMITS
MIN/MAX [mbar]
0/18
1.2 / 36
-18 / +18
0/50
3.3 / 100
-50 / +50
0/350
23.3 / 700
-350 / +350
0/1000
66.7 / 2000
-1000 / +1000
0/2500
166.7 / 5000
-2500 / +2500
0/5000
333.3 / 10000
-5000 / +5000
0/10000
666.7 / 20000
-10000 / +10000
NOTE
: Whenever an adjustment <10bar would be necessary, check if it is possible to do and create
the atmospheric reference with a dedicated tube passing inside the supply cable.
Figure 1: differential pressure transmitter SST77B
cable gland
enclosure
process connection
sensive element
(diaphragm)
