Fischer pressure transmitter Building technology DE50
Application
Measuring transmitter with limit switching functions for overpressure, vacuum and differential pressure especially for gaseous medium. This line of products is suitable forAirconditioningVentilationEnvironment technics. Typical ApplicationsContinious control of ventilatingMonitoring of tapline filters, exhausters, etc.Chimney draft measurementFlow- and control pressure measurementSurface technique. Main Features High overpressure safety Rugged design Maintenance-free measuring system due to the wear resisting inductive measuring cell.
Construction an Operation. The function of this transmitter is based on a capsule element measuring system suitable for over-pressure-, vacuum- and differential pressure measurements. The pressure or the differential pressure, which has to be measured, displaces the capsule element and moves hereby the core of the inductive displacement transducer. The electronic amplifier generates an electrical output signal. Different types of electronics can be supplied. Apart from the different operating voltages the output signal can be supplied as a current signal or a voltage signal. Flow rates of gaseous medium are often measured by measuring the differential pressure. In order to obtain a flow proportional measuring value the differential pressure signal has to be square-root extracted. For those applications transformation electronics are used which supply square-root extracted output signals. In addition to the analogue output signal potential free relay outputs can be supplied. They can be adjusted to any value within the measuring range. By means of a built-in LC-display (option) a local linear indication of pressure-/differential pressure measuring values is possible.
Technical Data: Measuring ranges 01 mbar to 0C600 mbar (acc. to ordering code
Nominal pressure of measuring system: Max. 3 bar (acc. to ordering code)
Max. static pressure Overpressure safe up to permitted nominal pressure
Measuring accuracy
Measuring range 1.6/2.5 mbar 2.5% FS
Measuring range 7 4 mbar 1% F Temperature drift 0.5%/10 K
Permissible ambient temperature: C10to +60
Permissible medium temperature: C20to +70
Protection class
IP 54 acc. to DIN 40050
Electrical Data
Electric connections:3-wire3-wire2-wire
Operating voltages
230 V AC230 V AC24 V DC
115V AC 115V AC
24 V AC24 V AC
24 V DC24 V DC24 V DC
Power draw
3 VA approx.3 VA approx.3 W approx.
Output signal
0C20 mA0C10 V DC4C20
Apparent ohmic resistant
Max. 800 Ohms> 2 k OhmsMax. 500 Ohms
Current limit
30 mA approx.30 mA approx.30 mA approx.
Voltage limit
C2 V DC approx.
+/C 0.5
Square-rooted output
with floating figures suppression
2% adjusted
10% approx. of full scale range
Slope adjustment
Zero point adjustment
10% approx. of full scale range
Measuring Value Indication/Switchpoints
Indication
31/2-digit LC-display
Switchpoint adjustment
The digital indicator can be switched over between the differential
pressure actual value and the switch point adjustments,
via a selection switch.
Selection of the desired output I or II via a selection switch.
The display now shows the relating, adjusted set point.
The set points are adjustable over the complete measuring range.
Switchpoint hysteresis
2% approx.
Contact output
1 or 2 potential-free change-over contacts
Load data of contacts
U max. = 250 V AC, I max. = 2 A, P max. = 250 VA
Connection
Electrical connections
Internal connector bloc, PG 9-screw connections
Pressure connections
Female screw thread G1/4
cutting ring screw connection for 6/8 mm pipe
Screw connection aluminium for 6-8 mm flexible tube
Material
Case
Die-cast part, painted
Covering cap
ABS-self-extinguishing
Measuring element
Capsule element of Cu Be 2
Installation
In case of wallmounting: vertical
In case of a different fitting position zero point adjustment
is recommended
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