POWER January 2012 - 17
the probe for the low dielectric constant,
inability of the devices to withstand the
physical rigors of the application, or some
combination of these reasons. After considering
its control device options, the
utility installed an Endress+Hauser FTI77
level switch (Figure 3) on the precipitator
to replace the failed capacitance sensor.
The installation was so successful that
the utility is planning to install two FTI77
switches on all 16 of its precipitators.
For this application, a level switch that
is designed for point level detection at
high temperatures in bulk solids, similar
to that found in the ESP hoppers, is the
best choice. Another good feature is the
switch's active buildup compensation that
detects and compensates when fly ash
3. Well-designed switch. The FTI77
level switch is ideal for precipitators, because
it works in high temperatures and has a compensation
circuit for ash buildup on the sensor.
Courtesy: Endress+Hauser
accumulates around the probe, facilitating
safe switching. This level switch can
also withstand a maximum load or lateral
stress of up to 590 ft-lb, making it suitable
for fly ash hopper applications. It
also has a sword probe instead of a round
probe, which increases the surface area
of capacitance, improving performance in
low dielectric applications, such as fly ash
level measurement. Additionally, the design
prohibits fly ash from entering the
electronics housing should probe damage
occur, eliminating the possibility of any
static electricity discharges.
When installing point level sensors,
PM_USA_MultiDisc_11,58_19,05.qxp:Layout 1 27.06.2011 12:06 Uhr Seite 1
users must be concerned about space
limitations. Most precipitator hoppers
are grouped tightly together with limited
clearance. This switch requires that probes
be a minimum of 20 inches apart. The
threaded coupling should be as short as
possible, because condensation or product
build-up can adversely affect operation in
a long-threaded coupling (Figure 4).
Geiger
MultiDisc®
Screen
> Fish Friendly - EPA 316b
Compliant Screens
> Eliminates Condenser
Fouling from Debris
Carryover
> Easily Retrofit
> Low Maintenance Design
> Single Chain
>No Submerged Bearings
or Shafts
> Integral Spray Pump
For more Info
Contact: dlanderson@passavant-geiger.us
Or call: 631 239 4121
January 2012 | POWER
Passavant-Geiger GmbH
Hardeckstrasse 3
76185 Karlsruhe · Germany
www.passavant-geiger.de
CIRCLE 8 ON READER SERVICE CARD
www.powermag.com
17
http://www.passavant-geiger.de
http://www.powermag.com
POWER January 2012
Table of Contents for the Digital Edition of POWER January 2012
Contents
POWER January 2012 - Cover1
POWER January 2012 - Cover2
POWER January 2012 - Contents
POWER January 2012 - 2
POWER January 2012 - 3
POWER January 2012 - 4
POWER January 2012 - 5
POWER January 2012 - 6
POWER January 2012 - 7
POWER January 2012 - 8
POWER January 2012 - 9
POWER January 2012 - 10
POWER January 2012 - 11
POWER January 2012 - 12
POWER January 2012 - 13
POWER January 2012 - 14
POWER January 2012 - 15
POWER January 2012 - 16
POWER January 2012 - 17
POWER January 2012 - 18
POWER January 2012 - 19
POWER January 2012 - 20
POWER January 2012 - 21
POWER January 2012 - 22
POWER January 2012 - 23
POWER January 2012 - 24
POWER January 2012 - 25
POWER January 2012 - 26
POWER January 2012 - 27
POWER January 2012 - 28
POWER January 2012 - 29
POWER January 2012 - 30
POWER January 2012 - 31
POWER January 2012 - 32
POWER January 2012 - 33
POWER January 2012 - 34
POWER January 2012 - 35
POWER January 2012 - 36
POWER January 2012 - 37
POWER January 2012 - 38
POWER January 2012 - 39
POWER January 2012 - 40
POWER January 2012 - 41
POWER January 2012 - 42
POWER January 2012 - 43
POWER January 2012 - 44
POWER January 2012 - 45
POWER January 2012 - 46
POWER January 2012 - 47
POWER January 2012 - 48
POWER January 2012 - 49
POWER January 2012 - 50
POWER January 2012 - 51
POWER January 2012 - 52
POWER January 2012 - 53
POWER January 2012 - 54
POWER January 2012 - 55
POWER January 2012 - 56
POWER January 2012 - 57
POWER January 2012 - 58
POWER January 2012 - 59
POWER January 2012 - 60
POWER January 2012 - 61
POWER January 2012 - 62
POWER January 2012 - 63
POWER January 2012 - 64
POWER January 2012 - 65
POWER January 2012 - 66
POWER January 2012 - 67
POWER January 2012 - 68
POWER January 2012 - 69
POWER January 2012 - 70
POWER January 2012 - 71
POWER January 2012 - 72
POWER January 2012 - Cover3
POWER January 2012 - Cover4
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