Tecfluid CP CH420 Series, Инструкция по эксплуатации

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10
Analog loop electrical characteristics for communications :
Reception Impedance:
Rx > 8,5 MΩ
Cx < 200 pF
8 KEYBOARD LOCK AND “WRITE PROTECT”
The transmitter has a jumper situated behind the display on the left hand side which can be
used to avoid changes in the configuration. When the jumper is set, the transmitter can be
configured by means of the keyboard or through HART communication. When the jumper is
removed, the push buttons are disabled and the HART write protect is activated, thus
inhibiting any changes in the configuration.
9 TECHNICAL CHARACTERISTICS
Power supply
2 wires, by means of the loop current.
The instrument has a protection diode to avoid damage if the power supply is connected
with inverted polarity .
Nominal voltage: 7.5 ... 36 VDC
Power consumption: ≤ 20 mA
Totalizer
N. of digits: 7
Size of the digit: 8 mm
Reset: By means of push button
Flow rate Indication
N. of digits: 5
Size of the digit: 5 mm
General characteristics
Ingress protection:
CP … CH420L: IP65
CP … CH420R: IP40
Ambient temperature range: 0ºC … +60 ºC
Numbr of Common Practice Commands 13
Number of Device Specific Commands 2
Bits of Additional Device Status 12
Alternative operating modes? No
Burst mode? No
Write Protection? Yes