Perma Pure AS-200-08-PSH, AS-200-08-SSH User Manual

PRINCIPLE OF OPERATION

AS™-Series Ammonia Scrubbers remove ammo­nia from a gas stream to protect analyzers and
sample lines from clogging due to the formation of
ammonium salts.

Ammonia reacts with phosphoric acid, forming
ammonium phosphate. This relatively high melting
point salt immediately deposits inside the ammo­nia scrubber, removing it from the gas stream.
The reaction is quite selective, and does not affect
the concentrations of other gases in the steam.

AS™- Series

Ammonia Scrubber

User Manual

Figure 1 - Flow Schematic

Phosphoric acid is very hygroscopic so it will draw
water from the gas stream, creating some liquid
phosphoric acid solution in the bottom of the
scrubber. To avoid excess liquid formation, the
scrubber should be heated, either by installation in
a heated enclosure or by using a heated scrubber.

The AS-Series proprietary scrubber media has
been formulated for continuous operation. Its life
expectancy is dependent upon the sample flow
rate and ammonia concentration in the gas
stream. It is very selective in its reactions with the
gas, removing only ammonia. It is also a very safe,
stable chemical to handle and store.

AS™ is a trademark of Perma Pure LLC.

Bulletin# 250

PERMA PURE

8 Executive Drive
Toms River, N.J. 08755
Phone: [phone]

732-244-0010
Fax: [phone]
e-mail: [e-mail]
Web Site: www.permapure.com

AMMONIA SCRUBBER SPECIFICATIONS

REPLACING SCRUBBING MEDIA

HEATER JACKET SETUP

Polysulfone Stainless Steel
Pressure 30 psig 100 psig
Temperature 120°C 200°C*
Port Size 1/4 " NPT 1/4" NPT

* When thumbscrew is replaced with SST Hex Bolt.

Be sure to connect sample inlet to port marked “IN” on

the scrubber housing.

PERFORMANCE

The Ammonia Scrubber performance varies
depending on the concentration of ammonia and
flowrate of the gas sample. At a flowrate of 1 lpm
and 1ppm of ammonia, media should last 40,000
hours.

When deposits are visible 75% of the way up the
housing, the scrubbing media needs to be replaced

(see Figure 2).

1. Unscrew thumbscrew on bottom of housing.

2. Swing yoke to one side.

3. Separate housing and bottom cap as an assembly
from top cap.

4. Remove spring.

5. Remove old media and dispose of properly (hous­ing may be rinsed with soapy water to clean).

6. Fill housing with 150cc of Berl Saddles (tap hous­ing to allow material to settle).

7. Pour 50cc of Scrubbing Media.

8. Replace stainless steel screen on top of media.

9. Replace spring.

10. Clean o-rings on shell and inside top
manifold (replace if necessary).

11. Place center tube into o-ring seal in top cap.

12. Push and twist to seal housing around o-ring.

13. Replace yoke and tighten thumbscrew finger ­ tight (do not overtighten).

Shoulder Screw

Jacket

Yoke

Thumbscrew

Figure 2

Power Supply Connection for Heater Jacket

1. Connect 120/240VAC power supply to wires on
scrubber (note: white wire must be capped with
wire nut since voltage is present when heater is
energized in 240VAC operation).

YOKE

Figure 2

BURL SADDLES

& MEDIA

THUMB SCREW

Warning!

DO NOT overtighten the thumbscrew.

Doing so may cause the housing to
crack.

2. Allow heater jacket to run for 15-20 minutes
before starting sample flow (heater is equipped
with thermocouple and thermostat to regulate
heater).

REPLACEMENT PARTS

Part Number Description

AS-200-08-PSH Stainless steel top & bottom with polysulfone shell
AS-200-08-SSH Stainless steel top & bottom with stainless steel shell
AS-200-3 O-ring replacement set
AS-200-08-EB 15 filling replacement burl saddles and media

1