592 M1 02 A
07-01-2008
Page 2
SAFETY PRECAUTIONS
• The device may only be connected to supply power, which is rated as specified in the technical features.
• Installation, initial start-up and maintenance may only be performed by trained personnel
DESCRIPTION
The MEMPRO Ex C... measuring instrument operates in accordance with the Pitot static principle, i.e. the level signal is proportional
to the hydrostatic pressure in a measuring tube plunged into the liquid. It is used for measuring fill-levels of flammable liquids. The
device is approved for use in danger zone 0 for flammable media assigned to explosion group IIC. The MEMPRO Ex C... fill-level
transmitter is used as a passive 2-pole device in intrinsically safe circuits. It converts the backpressure signal into a load independent
current within a range of 4 to 20 mA.
ATTENTION!
The fill-level measuring signal depends of the liquid density. For a density of less than 1 kg per Litre, the maximal output signal of 20 mA
is first achieved at a fill level of greater than 1000 mm, or sooner at a density greater than 1.
OPERATION LIMITS
The MEMPRO hydrostatic level transmitter could be restricted in its signal response because of some specific operating conditions.
• Media with high fluctuation of density: level measurement will correspond to the mean value of density you may consider.
• Media with high viscosity or sticky fluids.
• Media subject to excessive temperature fluctuations (ΔT >30°C)
• Degassing media
Consult us for further details.
TECHNICAL FEATURES
Fill-level measuring range:
0 to 1000 mm Water Column
Process interface:
G1" threaded connection
G1
1/2
” sleeve nut
Output signal:
4 to 20 mA
Ambient temperature:
Use in category 2: -20 to +70° C
Use in category 1/2: -20 to +55° C
Process pressure:
Atmospheric
Connector cable:
Special cable with shield
and pressure compensating tube
Attention!
Do not kink or pinch the cable
The pressure compensating tube
is otherwise blocked, resulting in a
distorted measuring signal.
EC Type Examination:
TÜV 04 ATEX 2420
CE Mark
EMC directive (89/336/ECC)
• EN 50 081-1:1992
• EN 50 082-2:1995
ACCESSORIES
On request, we can provide a power supply unit for Measuring Transducer:
- Conventional 4-20 mA, 2-wire measuring transducer
- With isolated DC power in potentially explosive atmospheres
- With measuring signal transfer from the loop to another isolated circuit used
to actuate a load in the safe zone.
Consult us for further details.
May only be connected to certified
Intrinsically safe circuits
Ui ≤ 30 V, Ii ≤ 300 mA, Pi ≤ 1.0 W
Use a dedicated buffer amplifier
G1
1/2
” sleeve nut
G 1” threaded connection
