Pressure level transmitter

Level sensing relative andabsolute pressure transmitter
Type 712
The level sensing pressure transmitter Type 712 is manufactured using an relative or absolute pressure measuring cellwith an adjusted and amplified sensor signal and is available
with various cable lengths from 2 to 30 meters. The Type 712
offers Ex protection as well as versions with integrated temperature measurement.
In addition to voltage and current outputs the Type 712 isavailable with ratiometric outputs.

Pressure range
0 ... 0.3 - 3 bar+ suitable for drinking water+ intrinsically safe execution with voltage- and current
output+ suitable for fitting in 1-inch pipe
+ with integrated temperature measurement

Pressure and flow

Huba Control Type 712 | Technical data subject to change | Edition 09/2020

1/6

Technical overview
Pressure range
Relative
Absolute

0.0 ... 0.3 – 2.5 bar
0.8 ... 1.4 – 3.0 bar

Operating conditions

Fuel oil, ultra-light 1)
SN 181 160-2
Fuel oil, heavy 1)
SN 181 160-21)
Diesel oil1)
BenzineDrinking water (with EPDM O-ring)-20 ... +80 ºC-40 ... +80 ºC
3x fs; max. 3 bar at 0.3 bar version

MediumMedium and ambient 2)
Storage

Temperature
Overload
Materials in contact with medium
CaseSensor
Cable
Protection cover
Sealing material
Electrical overview
2 wire3 wire4 wire (with temperature)
Polarity reversal protection

Stainless steel 1.4404 / AISI 316L
Ceramic Al2O3
PE-HD
PPE
FPM, EPDM (for drinking water)
OutputPower supply
4 ... 20 mA
10 ... 30 VDC
0 ... 10 V
12 ... 30 VDC
ratiom. 10 ... 90%
5 VDC ±10%ratiom. 10 ... 90%
5 VDC ±10%
Short circuit proof and protected against polarity reversal.

Overvoltage protection
Electric strength towards case
Temperature output

Load-7V< Power supply[Ohm]
0.02 A>10 kOhm / < 100 nF> 5 kOhm / < 100 nF> 5 kOhm / < 100 nF

Current consumption< 20 mA< 5 mA< 3 mA< 3 mA

4 ... 20 mA / 0 ... 10 V
ratiom. 10 ... 90 %36 VDC
6 VDC
500 VDC> 1 MOhm

Dynamic response
Response time

< 2 ms

RuntimeTime starts at the moment of application of minimal supply voltage< 10 ms

Electrical connection
Cable PE-HD length 2, 5, 10, 15, 20, 30 m

Protection standard
IP 68

Test / Admissions
Electromagnetic compatibility
UL

CE-conform acc. to EN 61326-2-3
ANSI/UL 61010-1 acc. to E325110
ACSWRASUBA guidance (KTW and elastomer)
W270

Drinking water approval
Drinking water verification certificate for plastic parts
Ex-protection
IECEx SEV 12.0006
SEV 12 ATEX 0138

Ex ia IIC T4 Ga
II 1 G Ex ia IIC T4 Ga

WeightWithout cable~ 200 g

Packaging
Single packaging

AccuracyStandardParameterMax. deviation 3) at 25 ºC
Resolution 4)
Thermal characteristic 5), 6)
Long term stability acc. IEC EN 60770-1Unitmax.

% fs% fs% fs/10K% fs

± 0.8
0.1
± 0.2
± 0.25Higher accuracy (only with ratiometric execution and pressure range > 1 bar)Parameter
Max. deviation at compensatedtemperature range 3) at -10 ... +60 ºC
Resolution
Long term stability acc. IEC EN 60770-1

Ex-protection to attention!
range 0.3 bar < 0.2 % fs1)

2/6

Pressure and flow

Unit

max.

% fs% fs% fs2)
5)

± 0.5
0.1
± 0.25non-congealing media
at -20 ... +80 ºC3)
6)incl. zero point, full scale, linearity, hysteresis and repeatability 4) pressure
0.3 bar-type with output 4 ... 20 mA = ±0.5% fs/10K

Huba Control Type 712 | Technical data subject to change | Edition 09/2020

1

Order code selection table
Pressure mode

Pressure range 1)

Sealing material
Output / power supply

Electrical connection 2)

Protection coverEx-protection
Pressure range variation(optional)

345678910712. X X X X X X X X X X

Absolute
Relative
Absolute with higher accuracy
Relative with higher accuracy
0.0 ... 0.3 bar
0.0 ... 1.0 bar
0.0 ... 1.6 bar
0.0 ... 2.5 bar

2relative pressure
relative pressure
relative pressure
relative pressure

Pmax.
4.5 bar
4.5 bar
6.0 bar
9.0 bar

0.8 ... 1.4 bar
0.8 ... 2.0 bar
0.8 ... 3.0 bar

89C
D

Max measurable level (for water dependingon the locations weather)
3.5 ... 6.7 mWs
9.6 ... 12.8 mWs
20.0 ... 23.0 mWs❶❷

absolute pressure
4.5 barabsolute pressure
6.0 barabsolute pressure
9.0 bar▲ Full scale signal at these pressures❶ PBARO = 1060 mbar (high pressure on sea level)❷ PBARO = 740 mbar (low pressure at 2000 meters above sea level)
FPM
Fluoro-elastomer
EPDM
Ethylene propylene (for drinking water)
4 ... 20 mA 10 ... 30 VDC
ratiom. 10 ... 90%
5 VDC ±10%ratiom. 10 ... 90%
5 VDC ±10%(with temperature)
0 ... 10 V
12 ... 30 VDC
2m
5m
10 m
Cable
15 m
20 m
30 m
without protection coverwith protection cover
without ex-protection
with ex-protection

1,2
1,2

9
9,D
9,D
9,D

1
1
1
1

3
1
2
4

8
8,C
8,C

1
1
1

1
2
40
10
1
2
30
1
2
34
520210004Indicate W and state range on order (e.g.: W0... + 2bar/OUT0...10V)

W

Dimensions in mm / Electrical connections

h - Fluid level- Measurement reference heightA - Distance from protection cover to the position of measuring diaphragmB - distance from beginning of thread to the position of measuring diaphragm(versions without protection cover)h4 ... 20 mA

ratiom. 10 ... 90%, 0 ... 10 V

ratiom. 10 ... 90% with temperature

brown

brown

brown

white

white

white

green

green

green
yellow

Device design with explosion
protection: 4 ... 20 mAThe grounding connection is conductively connectedto the level transmitter housing. The ground conductorof level transmitter must be connected to the equipotential bonding system of the plant.

Device design with explosion protection: ratiom. 10 ... 90%
The electronic GND is connected with a 1MΩΩ resistor to the level transmitter housing. The GND conductor of level transmitter must be connected to theequipotential bonding system of the plant.

brown

brown

brown

white

white

white

green

green

green
yellow

1)

Other pressure range on request

Pressure and flow2)

Other cable length on request

Huba Control Type 712 | Technical data subject to change | Edition 09/2020

3/6

Accessories

Order number

Cable hanger
Connection box
Test adapter
Protection cover (pack of 10)
Humidity protection element (pack of 10)
Additional weight
Calibration certificate

118026118027118028118067118068118093104551Connection box(1) Mounting hole(2) Vent valve(A) Measuring value process(B) Vent pipe(C) to the transmitterB)
(B)
(C)
(A)

Additional weight

Test adapter

Cable hanger

~200 g

hot-dip galvanized steel –PA6 glass fibre reinforced1) Inside thread Iso 228/1-G ¼ A



4/6

Pressure and flow.DEHOCableØ 4.5 ... 6.5

Huba Control Type 712 | Technical data subject to change | Edition 09/2020

Calculation of level
General level with relative pressure sensor:

General level with absolute pressure sensor:

whichandUsing a second level sensor as barometric airpressure sensor

For level sensor with current output use nominal signal values for ITS ... instead of variables UTS ... (resp. IBaro ... instead of UBaro ...)
Simplification of formula for level sensor with ratiometric output:

Using a second level sensor as barometric air pressure sensor

Legend:hlevel [m]

∆pPTS
PBARO

measured relative pressure [Pa]measured pressure of level sensor [Pa]measured pressure of barometer [Pa]PTS_NPPTS_EWPBARO_NP
PBARO_EW

minimal nominal pressure of level sensor [Pa]maximum nominal pressure of level sensor [Pa]minimal nominal pressure of barometer [Pa]maximum nominal pressure of barometer [Pa]ρgdensity of media [kg/m3]
acceleration of fall 9.80665 [m/s2]

UTSUBARO

signal on level sensor output [V or mA]
Signal on barometer output [V or mA]

UTS_NP
UTS_EWUBARO_NPUBARO_EW

minimal nominal signal of level sensor [V or mA]
maximum nominal signal of level sensor [V or mA]
minimal nominal signal of barometer [V or mA]
maximum nominal signal of barometer [V or mA]

Specification temperature output
3a + b • In

•OUT T+ c • In

•

TTEMP
T0Temperature NTC [ºC]-273.15 [ºC]

OUT T

OUT TRUINVoltage NTC [V]20'000 [Ω]
4.5 ... 5.5 [V]a = 0.001204001b = 0.000208775
c = 0.000000294

TTEMP (ºC)

TTEMP (ºC) @ UIN = 4.5 V
TTEMP (ºC) @ UIN = 5.0 V
TTEMP (ºC) @ UIN = 5.5 V

Difference to the measured temperature [ºC]

TTEMP = ƒ(OUT T)
Max. error of the temperature output

Temperature [ºC]

OUT T (V)

Pressure and flow

Huba Control Type 712 | Technical data subject to change | Edition 09/2020

5/6

www.hubacontrol.com