Product Data Sheet
SMS2000-001-1, Rev E
March 2006
SMS2000
Soap Management System 2000
PROBLEM
Many
pulp and paper mills have storage tanks filled with black liquor and soap. Since black liquor and soap are a commodity,
their containment must be monitored and controlled and their quantities
measured. Measuring the soap and liquor
interface and or soap layer thickness in the Kraft pulping industry has been uncertain
and often very difficult to achieve. Black
liquor is a highly alkaline material with high solids and a variable
density. Soap separates from the liquor
and forms a layer on top which can vary in density and thickness from a few
inches to several feet. Unreliable
knowledge of the soap / liquor interface can increase fouling in evaporators,
decrease recovery of soap, spills through overflows, decrease liquor recovery and
provide unknown tank levels for operators.
SOLUTION
Now
with the use of a specially engineered and proven flexible sensor hose, transmitter
electronics and a float design, this soap and liquor interface measurement can
be accurately achieved. Even though the
thickness and density of the black liquor and soap varies, it still achieves
accurate results. Combined with knowledge
of the top surface level of the soap with a properly applied microwave radar measurement,
it is possible to control tank levels and soap skimming with confidence.
EQUIPMENT AND SYSTEM BENEFITS
- Minimal operator attention of the soap level in
tanks.
- Prevents soap from entering liquor pumps and
evaporators
- Reduced fouling, increased Evaporator efficiency
and Tall Oil quality control.
- Prevents soap environmental spills.
- Better tank inventory control.
- Does not require calibration adjustments over
time.
- Simple calibration and set-up via HART PC
software.
- Maintenance free
RTS
Installations
US Sales Rep: Pemble
Consulting
Liquor & Soap Interface Level Principal of
Operation
The
Liquor and Soap interface is detected by a transmitter consisting of a flexible
stainless sensor hose. The hose is flange
mounted at the top and has a weighted anchor suspended at the opposite
end. Traveling up and down the flexible
sensor hose is a specially designed float that follows at the soap/liquor
interface. As the float position changes
along the flexible sensor hose it closes very small Reed contacts with its
magnetic field through the wall of the flexible sensor hose. The closed Reed
switches provide an uninterrupted measurement voltage from a resistance chain (a
potential divider) to the transmitter and this voltage is proportional to the
liquid interface level. This variable
voltage is then converted into a standard 4-20mA analog level signal. The most important piece of equipment is the
specially engineered 15” diameter large interface float which has the ability
to be adjusted to provide the needed buoyancy, based on calculations and the customer’s
process data. A correctly adjusted
buoyancy allows the interface float to maintain its position at the liquor and
soap interface with ease.
Interface
Float Interface Transmitter, Sensor Hose, Float
and Weight
Specifications
Soap and Liquor Interface Detector
Measurement: Range:
Maximum 60 feet
Material
of Construction: All
materials 316 / 304 SS
Mounting
Flange: 2”
150# ANSI rated RF flanged connection
Interface
Float: 15”
diameter, Specific gravity adjustable, smooth finish
Enclosure: 316SS
terminal box/w removable cover
Power
required/Output: 8-28
VDC/4-20mA continuous with Hart
Flexible
Sensor Float Guide: 16mm diameter
Resolution: +/- 12.7 mm
Approvals:
CSA, UL & ATEX
RTS
Installations
US Sales Rep: Pemble
Consulting
Soap Surface Level Principal of Operation
The
soap surface level is detected by using a microwave radar gauge. Extremely short microwave pulses at low power
levels are emitted by the antenna system to the measured product, reflected
from the product surface and received again by the antenna system. The pulses travel
with the velocity of light and the time from emission to reception of the
signals is proportional to the level in the vessel. From this a soap surface
level can be measured with a 4-20mA analog level signal. The advantages of using a microwave radar
gauge is that it is not affected by temperature, condensation build-up, process
composition changes and pressure changes.
Any false echo’s within the tank can be mapped out with the software.
6” Flanged 6GHz Microwave Level Transmitter Radar setup software with Echo mapping
Specifications
Soap Surface Level Detector
Measurement range: Maximum
length 90 feet
Material
of Construction: All
wetted material 316SS
Mounting
Flange: 6”
150# ANSI rated RF connection
Enclosure: Aluminum
epoxy coated
Horn:
6
inches diameter
Frequency: 6.0 GHz
Power
required/Output: 10-30
VDC/4-20mA continuous with Hart
Resolution +/- 10 mm
Approvals:
CSA, UL & ATEX
RTS
Installations
US Sales Rep: Pemble
Consulting