Model 10/20/30 NDIR
The
analyzer uses a technique based on the infrared absorption
characteristics of gases to measure gas concentration. Use of an
efficient single beam design results in a good long-term stability.
A
single beam of infrared energy is modulated and passed through a sample
cell containing the gas to be measured. The beam emerges attenuated by
the amount of energy absorbed by the gas(es) in the sample. Changes in
the concentration of the gas(es) result in changes in the intensity of
the beam. The remaining energy in the beam is passed serially through
two cavities of an infrared detector, a mass-flow sensor filled with
gas of the type to be measured.
Changes in the intensity of the
beam change the pressure differential between the cavities and
consequently the balance of the electrical bridge in the detector
circuit.
Electronic processing of the imbalance signal is used to
generate an electrical output signal proportional to the concentration
of the gas measured.
O2
PRINCIPLE OF OPERATION
The
Model 10/20/30 is designed to measure percent levels of oxygen. The
analyzer uses a galvanic fuel cell, which is an electrochemical
transducer. The fuel cell contains a cathode, anode and an electrolyte.
A permeable membrane holds the electrolyte in the cell. The sample
flows over the membrane and oxygen diffuses into the fuel cell where it
reacts with the electrolyte. This reaction produces an electrical
current which is directly proportional to the concentration of oxygen
in the gaseous mixture surrounding the cell.
The current output is linear with an absolute zero. In the absence of
oxygen the fuel cell produces no current.
SPECIFICATIONS
Available Ranges
CO
Minimum: 0-3000 ppm F.S.
Maximum: 0-50% F.S.
CO2
Minimum: 0-1000 ppm F.S.
Maximum: 0-30% F.S.
CH4
Minimum: 0-1% F.S.
Maximum: 0-15% F.S.
Note: 5 to 1 is the maximum available range ratio per component.
O2 (Chemical Fuel Cell Only)
0-10/25% F.S.
Repeatability: ±1.0% of Full Scale
Noise: Less than 1.0% of Full Scale
Ambient Temperature Range: 41 to104°F (5 to 40°C)
Ambient Humidity: Up to 90% RH (non-condensing)
Warm-Up Time: Approximately 2 hours for 90% Stability
Span Drift: 2% of Full Scale in 8 hours*
Zero Drift: 2% Full Scale in 8 hours*
Response Time (90% of Full Scale): Less than 10 seconds at 1 liter per
minute
Output: 0-1 VDC
Sample Flow Rate: 0.5 to 1.5 liters per minute (1.0 liter nominal)
Sample Condition: Sample gas dew point must be less than 90% R.H.
Power Requirements: 115 VAC ±10%, 60Hz, 15VAC (200VAC
& 50Hz available)
Weight: 15 lbs. (approximately); 6.8 Kg
Dimensions: 5-1/4”H x 19” W x 15” D
(133mm x 483mm x 381mm)
*At a constant temperature
Specifications subject to change without notice.
FEATURES/BENEFITS
- Microflow Detector
- High
sensitivity, long life, rugged, minimal interference from contaminant
gases. Low sensitivity to vibration, no optical or mechanical
adjustments required.
- Single Beam Optics
- No optical balance adjustments. Long-term photometric
system stability.
- Non-Corrosive Sample Cell
- Sample cells are brass SUS-304 finish to eliminate
corrosive degradation in conventional (gold-polished) cells.
- High stability & Easy Maintenance
- Design Technology assures long-term stability and very
infrequent maintenance.
- Trouble-Free Operation
- Microflow
Detector, single beam optics and solid state electronics assure simple,
inexpensive, long term, trouble-free operation
- Ranges
- One range per gas component is standard.
A second range is optional.
Note: Maximum range ratio between high and low range is 5:1
Readout
- Each gas component’s digital display will read
out in engineering units.
- Technical Support/Service
On-call technicians and same-day parts or in-shop repairs make
downtimes rare and minimal.
STANDARD APPLICATIONS
The
Model 10/20/30 contains a dedicated infrared analyzer bench for each
NDIR gas component and can be incorporated into an integrated system
for continuous measurement of CO, CO2, CH4 (or O2). Any three
components may be selected for measurement at the time of analyzer
purchase.
|
|
