M10 Signal converter - Forbes Marshall

www.krohne.com
© KROHNE 11/2002 7.02398.23.00
GR
M10 Signal converter
hazardous-duty version EEx d
for variable-area flowmeters H250/H54
II2G
Fully equipped
● direct sensing of float position
● current output 4 ... 20 mA in two-wire technology / HART
● HART communication
● two galvanically isolated binary outputs with selectable function:
● switch contact with NAMUR level to DIN 19234
● switch contact 24 V DC, open collector
● pulse output 10 Hz
● galvanically isolated binary input with function
● totalizing counter reset
● 3-line, 12-character alphameric display
● operator control optionally by way of
bar magnet (no need to open display) or keys (opened display)
Variable area flowmeters
Vortex flowmeters
Flow controllers
Electromagnetic flowmeters
Ultrasonic flowmeters
Mass flowmeters
Level measuring instruments
Communications technology
Engineering systems & solutions
Switches, counters, displays and recorders
Heat metering
Pressure and temperature

Signal converter M10
The H250/H54 variable-area flowmeter is equipped with an electronic
signal converter M10 of hazardous-duty design EEx d (flameproof
enclosure). There is no magnetic coupling nor pointer. The position of
the float is sensed directly.
The display can be adjusted using a bar magnet without having
to open the front cover.
Alternatively, adjustment can be done via the HART interface.
Technical Data
M10 display, general
Ambient temperature (*)
-25 to +75°C (other temperatures on request)
Protection (EN60529 / IEC 529) IP 67
General approval PTB 01 ATEX 1154
Explosion protection
EEx d IIC T6 … T1 / II2G
Accuracy for H250 Class 1.6 to VDI / VDE 3513
Accuracy for H54 Class 1.0 to VDI / VDE 3513
(*) Display contrast diminishes outside temperature range of 0 ... 60°C
Current output
two-wire technology (polarized)
Power supply 24 V DC +/- 30%
Signal output current
4 ... 20 mA (0 ... 100% flow)
NAMUR failure signal
22 mA
Power effect < 0.1 %
Ext. resistance dependence < 0.1 %
Temperature effect
< 5µA / K
Ext. resistance / load impedance
R ≤ 630 ohms at max. power
R ≥ 250 ohms with HART communication
Binary outputs (B1 and B2)
Galvanically isolated, 720 V DC
Mode Switching output with signalling current to NAMUR or
Switching output open collector
Configurable as switching contact open / closed or
pulse output max. 10 pulses per second
Switching output, NAMUR power supply 8V
signalling current >3 mA limit point not crossed;