Version I/2003

APLISENS Sp. z o.o., ul. Morelowa 7

, tel. [phone]

fax [phone], www.aplisens.com.pl, e-mail: aplisens@

.com.pl

, 03-192 Warszawa

aplisens

SG-25.Smart and SG-25S.Smart type

smart hydrostatic level probes

∅

25

140

Capillary

Red

(+)

Black

(–)

Safety

diode

shield

Diaphragm level

∅

25

141

Capillary

Red

(+)

Black

(–)

Safety

diode

shield

14.5

∅

60

Carrying

handle

Aplisens

KAP-01

Communicator

SG-25.Smart

SG-25S.Smart

ü Programmable zero shift, range

and damping ratio

ü Standard Bell 202 communication

(HART protocol compatible)

ü Accuracy: 0.1%, digital compensation

of secondary errors

ü Internal integrated circuit provides

excess voltage protection

ü EExi

a

I/IICT6 spark proof

Application

The SG-25.Smart smart hydrostatic level probe is designed

to measure liquid levels in tanks, wells or piezometers.
The SG-25S.Smart smart hydrostatic level probe is de-

signed to measure levels of liquids containing contaminants

and suspensions. The probe is typically used to measure the

level of liquid wastes at intermediate pumping stations,

fermentation chambers, setting tanks etc.

Principle of operation, construction

The probe measures liquid levels based on a simple rela-

tionship between the height of the column of liquid and the

resulting hydrostatic pressure measurement is made at the

level of the separating diaphragm of the submerged probe

and is related to atmospheric pressure via a capillary in the

cable.
The active sensing element is a piezoresistive silicon sensor

separated from the medium by an isolating diaphragm. The

sensor works in combination with a digital module equipped

with a safety circuit protecting the probe from excess voltage

damage included by atmospheric discharge or by the power

supply devices.

Settings

You can select the following settings:

♦

Pressure units defining the measuring range,

♦

End-points of range,

♦

Damping,

♦

Inverted characteristics (output signal 20 ÷ 4 mA).

Calibration

Zero shift and calibration against pressure standard.

Communication

Hart protocol with 4 ÷ 20 mA signal. Setting and calibration

trough KAP-01 communicator unit, some Hart compatible

communicators or PC through an RS-Hart interface and

Aplisens RAPORT-01 configuration software.
Additional features enabling data exchange with the probe

are:

♦

Probe identification,

♦

Current reading of pressure, output current and percent-

age of measuring range.

Version I/2003

APLISENS Sp. z o.o., ul. Morelowa 7

, tel. [phone]

fax [phone], www.aplisens.com.pl, e-mail: aplisens@

.pl

, 03-192 Warszawa

aplisens.com

Assembly, operation

Released et the reference level, the probe can hang freely on

the cable or lie on the bottom of the tank. The cable with

capillary can be extended, using a standard signalling cable.

The cable connection should be containing in a non-airtight

box (internal pressure equal to atmospheric), which prevents

ingress of water or other contaminants into the capillary.

Measurement ranges

Ref.

Maximum range

(MR)

Maximum range

(measurement limits)

Minimum range

Zero suppression limit

Overpressure

limit

1

0...10 m H

2

O

-1...11.5 m H

2

O

0.8 m H

2

O

0...10 m H

2

O

30 m H

2

O

2

0...100 m H

2

O

-5...115 m H

2

O

8

m H

2

O

0...100 m H

2

O

300 m H

2

O

Technical Data

Metrological parameters

Accuracy

≤

±0.1%

for the maximum range

SG-25.Smart

≤

±0.3%

for 0...10% MR

Accuracy

≤

±0.16%

for the maximum range

SG-25S.Smart

≤

±0.4%

for 0...10% MR

Thermal error

< ±0.08% (MR) / 10°C

< ±0.2%

for the whole thermal

compensation range

The additional diaphragm seal of the SG-25S.Smart probe

introduces up to 80 Pa / 10°C of additional thermal error.

Thermal compensation range -10...60°C

Damping

of the sensing module

0.3 s

added electronically

0...30 s

Error due to U

sup

changes

0.002% (MR) / V

Electrical parameters

Power supply

10...30 V DC

Output signal

4...20 mA two wire transmission

Load resistance R[ ]

U

V

V

A

sup

Ω ≤

−

⋅

[ ]

.

.

10

0 02

0 95

Resistance required for communication 250...1100

Ω

Environmental conditions

Process temperature limits

-30...80°C for the maximum range 0...12 m H

2

O

-30...50°C for the maximum range 0...100 m H

2

O

ATTENTION: Do not allow the liquid to freeze in the immediate vicinity of the probe
Construction material of case and isolating diaphragm 00H17N14M2 (316Lss)

Cable shield POLYURETHANE

Extra features:

◊

Teflon – Teflon cable shield

◊

-25 ÷ 80°C – extended thermal compensation range

SG-25.Smart /___/__÷__/__÷__/ L = ... m

SG-25S.Smart /___/__÷__/__÷__/ L = ... m

Extra features:

Teflon, -25 ÷ 80°C

Maximum range (MR)

Cable length

Example

level probe

maximum range:

preset range:

cable length

: SG-25.Smart

, Teflon cable shield,

0 ÷ 10 m H O,

0 ÷ 3.25 m H O,

10 m

2

2

SG-25.Smart / Teflon / 0 ÷ 10 m H O / 0 ÷ 3.25

/ L = 10 m

2

m H O

2

Ordering procedure

4 ÷ 20 mA

e.g. Aplisens

ZL-24

Connection of the

communicator diagram

Power

supply

250

< R < 1100

Ω

Ω

Communicator or

RS-Hart interface

R – total resistance of current loop

Preset range

Level probe

P

I