E6 52 DTR.APC.APR.ALW.03(ENG)
Example:
Exceeding the basic range of the pressure by more than 50% is signaled on the display using the OVER 'ouEr'
or
UNDER 'undEr' message. The alarm in case of exceeding the range of pressure in the transmitter in MID
version is described in the MID annex.
The APC(R)-2000ALW (Ex) transmitters generate an process variable analogue signal in the range ≥ 3.8-3.9
mA …≤ 20.5 mA). Depending on the settings this signal may be proportional or inversely proportional to the
measured pressure or pressure difference. This current is detected by the logic controller connected to the
current loop, which monitors whether the supplied signal is:
- within the pressure or differential pressure measurement range between the lower range value (LRV) and the
upper range value (URV)
Range (≥ 4.0 mA …≤ 20.0 mA) with simple characteristics (4-20 mA)
Range (≤ 20.0 mA …≥ 4.0 mA) with inverse characteristics (20-4 mA)
- within the pressure or differential pressure measurement range below the lower range value (LRV)
Range (≥3.9 mA … < 4.0 mA) for Normal mode with simple characteristics (4-20 mA)
Range (≥3.8 mA … < 4.0 mA) for Namur mode with simple characteristics (4-20 mA)
or
Range (> 20.0 mA …≤ 20.5 mA) for Normal mode with inverse characteristics (20-4 mA)
Range (> 20.0 mA … ≤ 20.5 mA) for Namur mode with inverse characteristics (20-4 mA)
- within the pressure or differential pressure measurement range above the upper range value (URV).
Range (> 20.0 mA … ≤ 20.5 mA) for Normal mode with simple characteristics (4-20 mA)
Range (> 20.0 mA … ≤ 20.5 mA) for Namur mode with simple characteristics (4-20 mA)
or
Range (≥3.9 mA … < 4.0 mA) for Normal mode with inverse characteristics (20-4 mA)
Range (≥3.8 mA … < 4.0 mA) for Namur mode with inverse characteristics (20-4 mA)
or
Range (< 3.7 mA) for type "L" alarm signal
Range (> 21.5 mA) for type "H" alarm signal
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