D-FW 231

Filter Monitor

Filter monitor to detect the efficiency and function of filters and filtration systems. Dust Monitor for qualitative measurement of dust concentration in dry process or flue gas.

Overview

In situ measurement, continuous measurement
Qualitative dust measurements for monitoring the functions of filters
Single-sided mounting on the channel
No moving parts within the duct
Easy installation, adjustment and maintenance without a PC

Applications

Power Plants
Bag-filter of any kind
Dust in the manufacturing industry
Incinerators
Crematoria

The measurement principle is not suitable for use directly behind electrostatic filters.

Certifications

Technical Data

measured component	dust load
sample gas	air, flue gas, non flammable process gas
dust concentration** (typical values)	1 - 25 / 2-50 / 5 - 100 / 10 -200 / 20 - 400 mg/m3
flow velocity***	7-40 m/s
duct diameter	> 0.15 m
sample gas temperature	-20°C - 200°C / 500°C*
sample gas pressure (relative to ambient pressure)	-500 to +500 hPa, others on request
sample gas moisture	20 ... 80% rel. humidity
ambient temperature	-20 to +50 °C

measuring principle	measuring the transfer of electrical charge from dust particles to an electrode in flowing sample gas
type	4 (7) wire transmitter, in situ, mounted at stack, probe is in contact with sample gas
system-Components	D-FW 231 M Measuring head D-FW 231 P probe/electrode
measuring ranges	0 - 100% Tribo-value, 6 per micro DIP switch selectable ranges
output range	0- 100% Tribo value
process connection	G1" female thread, tube ID >= 36mm, L max. 100 (300*) mm Adapters for flanges already mounted at the site on request

measurement output	1 x 4–20 mA / 500 Ohm
control input	2 x transistor-Input zero check, integration
supply	18 - 36 V DC; 0.2A
IP protection	IP65
dimensions (hxwxd)	180 x 80 x 270 mm (without D-FW 231 P Probe)
weight	1.9 kg
material	housing: Al alloy, painted RAL 5017 probe connector: 1.4571 isolator: PTFE / ceramic*

available rods (length)	80, 250, 400, 700, 1000 mm
material	1.4571, others on request
remarks	* Variations The suitability of D-FW 231 for the listed ranges depends upon the kind of dust and its size distribution. * the measuring effect is dependant upon the flow speed. Subject to technical modifications!