Application
and function
The filter controller PFM 92 Ex serves the qualitative monitoring
of dusty emissions in areas endangered by dust explosions. In particular
it is often used for the registration of the clean gas dust content
behind de-dusting facilities. The measuring principle is based on
the use of the triboelectric effect (charge transfer at colliding
or passing of particles on leading surfaces).
The filter controller consists of an isolated probe which is installed
in the clean gas channel. The charge transferred by contact and triboelectric
processes is derived as current, converted in the evaluation unit,
amplified and provided as norm signal 4 ... 20 mA. Via a limit value
detector the exceeding of the allowable emission limit value can be
signalised optically or acoustically.
Specifications
| PRODUCT
SPECIFICATION |
DESCRIPTION |
| Control unit: |
Weather-proof aluminium
case IP 65, Dimensions: 210 x 240 x 280 mm (H x W x D)
|
| Probe: |
Stainless steel probe
rod with pre-amplifier in the probe head, probe length
300 mm (adjustments possible), IP 65 |
| Measuring principle: |
Dust: measurement
with 1 triboelectric sensor |
| Measuring range: |
0,1 ... 1.000 mg/m³
(special measuring ranges on demand) |
| Calibration: |
By gravimetric reference
measurements |
| Display: |
LCD-Display (0 ...
100 %) |
| Media temperature: |
max. 280 °C |
| Ambient temperature: |
-20 ... +50 °C
|
| Dew point
difference: |
min. +5 K |
| Flow velocity: |
From appr. 3 m/s |
| Analogue signals: |
1 x 4 ... 20 mA (dust)
|
| Digital signals: |
3 potential-free contacts
(failure, limit value 1 and 2) |
| Power supply: |
230 VAC |
| ATEX-Guideline: |
Probe: Ex II 1D zone
22, probe head: Ex II 3D, control unit: not-Ex-area |
| TÜV-Approval: |
TI-Air |
|
