DURAG D-R 290, Руководство по эксплуатации

Страница: 149 / 202

7 | Checking / setting parameters with D‑ESI 100
D-R 290 149
Temperature compensation
Temperature and pressure compensation using the device
parameters
The Dust and Opacity Monitor D‑R 290 can covert a calculated dust concentration into
a dust concentration per standard cubic metre.
For this the dust concentration determined in mg/m
3
is converted to the standard sta­
tus at 0°C according to the following formula:
C
(standard)
=
Temperature of the gas being me 273.15°C
Standard tempe 273.15°C
×
Media pressure
1013.25 hPa
(measurement)
C
The display of the calculated value based on a standard cubic metre is performed by
selecting the type code 0x0052 for one of the four output channels. (see also section
7.5.2 Type code [
}
127] .)
The determination of the media conditions is performed either
●
by describing the media conditions by D−ESI 100, D−ISC 100 or Modbus.
Setting path:
Device (D‑R 290 ) > >
Common parameters >
D‑R 290
Setting variables
>
Media conditions
●
by using a D−ISC 100 analogue input module and the "Media conditions" software
module in the D−ISC 100.
●
in a special variant of the D‑R 290 via the optional 4−20 mA temperature input
(see section 7.7.10.2 Temperature compensation via an external temperature trans­
mitter (special variant) [
}
149] )
Temperature compensation via an external temperature
transmitter (special variant)
The necessary determination of the temperature of the gas being measured is per­
formed by means of an additional temperature measurement input (4-pin plug connec­
tion) at the measuring head ( Fig. 5.12 - item 2).
The parameter
Common Parameters ­> Setting variables ­> Media conditions ­>
Media temperature
for the standardisation described above is meaningless for this device variant.
This input is arranged as a 4..20 mA interface. Suitable temperature transmitters
(transducers) with 4..20 mA output are available as accessories.
The temperature measurement range be selected as any of
●
0..200°C (32..392°F),
●
0..400°C (32..752°F) and
●
0..1000°C (32..1832°F)
and should correspond to the temperature of the gas being measured.
7.7.10
7.7.10.1
7.7.10.2
Fig. 7.23: Temperature
transmitter