OPERATING MANUAL
MN-SST70
ED-19-01
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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8
DATA SHEET
FUNCTIONAL DATA
When the instrument works as a level
transmitter, its range is always defined by
the displacer (length). On the other hand,
when the instrument measures density or
interface its displacer is completely
immersed in the fluid (or in the fluids). This
means that the piezoresistive sensor
establishes the working limits of the
transmitter.
Max relative density difference (nominal
span):
equal to 1.42 (in fact for the
measurements in open vessel the top fluid
density is 0).
Minimum span
: ∆ρ = 0.1 (for interface
measurements).
Moreover the best measure resolution is
obtained working with the nominal density
difference
(<1.42).
In
other
words,
decreasing of measuring span determinates
lower output resolution (Ru %) as per
following relation:
Ru% = 0.01 x 0.75 x 1.42 / (Measuring Span)
TRANSMITTER PARAMETERS
The parameters that are available for
display and setting are:
Measuring span:
possibility to change from
10% to 100% of the nominal span.
Zero adjustment:
digital calibration ± 15%.
Linearity adjustment:
5 points within the
nominal range (in factory).
Low/upper range values:
they can be set
within nominal range providing that the span
is > minimum span
Damping:
digitally adjustable from 0 to 60
sec. (minimum response time 0.1 sec.)
Reverse output:
automatically obtained via
software.
Transfer
function:
linear/density,
selectable via software.
Self test:
In case of malfunction the analog
output is forced to the fail-safe state
3.85mA or 21 mA.
Measuring units:
4 different level units or
density or % of the measuring span,
selectable via software.
PHYSICAL CHARACTERISTICS
Power supply:
12.5 – 30 Vdc
Output signal:
Analog 4 – 20mA , 2 wires
Digital using HART® or FIELDBUS® protocol.
Response time:
<256 ms (Std Hart®)
Measured value update frequency:
4-20 mA + Hart® output:
̴
1s
Hart® output only:
̴
500 ms (on request)
Polling time:
4-20 mA + Hart® output:
̴
800 ms
Hart® output only:
̴
500 ms (on request)
OPERATIVE CONDITIONS
Temperature:
Process fluid
:-60 ÷ +150°C (with finned arm:
up to 350°C)
Enclosure
: -40 ÷ +80°C
Handling and storage
: -40 ÷ +90°C
Relative Humidity
: 0 to 100% R.H.
LCD display reading
: -10 ÷ +65°C
PERFORMANCES
Accuracy rating:
guaranteed within the
following limits:
Dead band:
negligible
Output resolution:
< 0,01% nominal range
(at 20°C)
Accuracy :
≤ 0.5%
1
Display resolution:
0.1
INFLUENCE OF OPERATING CONDITIONS
Thermal drift:
it is referred to -10 ÷ +80°C
range.
Zero:
±0.25%/10°C.
Span
: ±0.25%/10°C. nominal range.
Power supply effect:
negligible between
12.5 and 30Vdc.
1
Including hysteresis, non-linearity and repeatability
(IEC 60770)
