FISCHER DE49 # 0 series, Operating Manual, Page: 8 / 32

2 | Product and functional description FISCHER Mess- und Regeltechnik GmbH
8 / 32 BA_EN_DE49_0
2.3.1 Type plate
The presented type plates serve to show an example of the information shown.
The data shown is purely fictive, but does correspond to the actual conditions.
For more information, please see the order code at the end of these instruc-
tions.
0044 IBExU09ATEX1164
DE49
II 1/2 G Ex ia IIC T4 Ga/Gb
II 2D Ex ia IIIC T80°C Db
Tamb: -10°C to 60°C
Electrical data: see user manual
Product
Basic measuring range
Pmax.
Output signal
2-wire supply (Ex ia)
Prod. No.
Please note!
Do not separate
while energized
Functional
ground
DE49D90040BH00MV
0 ... 1000 Pa
10 kPa
4 ... 20 mA 2-wire
≤ 30 V DC
1705717.01.001
ATEX marking
Order Codes
Technical data
Serial number
Electr. connection Year of construction
Illustration 2: Nameplate
2.4 Function diagram
Safe area
Hazardous area
Zone 0/1/2
Zone 21/22
Supply PE
Ex ia
Zone 21/22
Zone 1/2
1,999 µC
A
GB
3V3
+
Illustration 3: Function diagram
2.5 Design and mode of operation
This switching device is based on a piezo-resistive sensor element that is suit-
able for measuring overpressure, underpressure and differential pressure.
The pressure acts on the silicone membrane of a semiconductor chip which in
turn deforms. The specific material resistance changes proportionally to the de-
formation.
The electronics inside the pressure transmitter casing now convert this resist-
ance change into an electrical output signal, calculate the pressure measure-
ment and display this on the LC display.
The optional output signal can be dampened, spread and inverted.