266CRx, 266JRx, 266CSx, 266JSx | OI/266CXX/266JXX/HART-EN Rev. B 77
Digital output (pulse / limit output)
This digital output can be set as a pulse or limit output
(transistor output) by making parameter changes using the
software.
NPN transistor with open collector output
Contact switching capacity 10 … 30 V, maximum 120 mA DC
Low-level output voltage 0 … 2 V
High-level output voltage Maximum 30 V
Quiescent current 500 μA
Fig. 50: High and low level (pulse output)
1 High level | 2 Low level
Fig. 51: Edge steepness
Pulse output
The scaled, electrically isolated pulse output can be used for
flow measurement by means of an external counter.
Pulse output frequency with 100 %
output
Maximum 10 kHz
Duty cycle 50 % ± 10 % @ 0.1 Hz to 10 kHz
Minimum pulse width 50 μs at 10 kHz, duty cycle 1:1
Limit output
The output is set to a static high or low signal when a given
limit is overshot / undershot.
Output function, model 266CXX
The 4 … 20 mA output signal is not linear; instead, it
corresponds to the compensated flow or fill level.
Output function, model 266JXX
The 4 … 20 mA output signal corresponds to the differential
pressure, pressure, or temperature, depending on the
configuration.
Output current limits (in accordance with NAMUR
standard)
Overload condition
— Lower limit: 3.8 mA (configurable from 3.8 … 4 mA)
— Upper limit: 20.5 mA (configurable from 20 … 21 mA)
Alarm current
— Minimum alarm current: 3.6 mA
(configurable from 3.6 … 4 mA)
— Maximum alarm current: 21 mA
(configurable from 20 … 22 mA)
Standard setting: High alarm current (max. alarm current)
Process diagnostics (PILD)
Plugged impulse line detection (PILD) generates a warning via
the HART communication. The device can also be configured
to drive the analog output signal to the "alarm current".
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