Owner's Manual

Sni t Model 50
Carbon Monoxide Analyzer
Introduction
Designed for HVAC professionals and utility person-
nel, the Snifi t Model 50 Analyzer is ideal for measuring
low levels of CO in ambient air such as in rooms and
garages, or around registers, furnaces, stoves, water
heaters, and other types of combustion appliances.
The Snifi t samples the surrounding air and shows the
detected concentration of CO on its Liquid Crystal Dis-
play. The Snifi t is not intended to be used in fl ue gases
or in temperatures exceeding 104 °F (40 °C).
Features
• Measures and displays 0 to 1999 ppm CO in room air
• Sensitive CO sensor will last up to 2 years
• Backlight for viewing in dark areas
• Compact pocket size
• Low battery indication
• Manual zero adjust
• Factory calibrated on 100 ppm CO
• Simple fi eld calibration
• Auto power-off after 35 minutes
• Single 9V battery (included) provides at least
1500 hours of operation
Bacharach, Inc.
621 Hunt Valley Circle, New Kensington, PA 15068
Ph: 724-334-5000 • Fax: [phone] • Toll Free: 800-736-4666
Website: www.mybacharach.com • E-mail: [e-mail]
Printed in U.S.A. ® Registered trademarks
Instruction 0019-9201
Rev.4 – May 2010
- 5 - - 6 -
Replacement Parts
Item Part No.
CO Sensor and Gasket .................................... 0019-7061
Filter ................................................................ 0019-3244
Accessories
Item Part No.
Calibration Kit ................................................ 0024-7059
Calibration Tool / Cup Kit .............................. 0019-3242
Span Gas Cylinder, 100 ppm CO in air ......... 0051-1994
Zero Gas Cylinder, 20.9% O
2
in Nitrogen ...... 0051-7131
Bacharach Service Center
Replacement parts and accessories can be obtained by
contacting the following Bacharach Service Center:
Bacharach, Inc., 621 Hunt Valley Circle
New Kensington, PA 15068
Phone: [phone] • FAX: [phone]
Figure 4. Sensor Installation
CO
SENSOR
GASKET
FILTER
WARNING!
Remove jumper-wire
(if installed) from pins
before installation
®
4. Remove wire-jumper (if installed) from pins of new
sensor; plug in sensor and install the new gasket
supplied; then reassemble the instrument.
5. Wait 30 minutes; then calibrate the new sensor.
Figure 3. Battery
Location
3. Push the Calibration Cup over the sensor housing.
4. Attach a CO Span Gas Cylinder to the regulator.
Then apply span gas to the sensor by adjusting the
regulator knob for a fl ow rate of 2 SCFH.
5. Allow span gas to fl ow until the displayed reading
stabilizes – approx. 3 minutes. Then, using Calibra-
tion Tool 0006-9453 (supplied in Calibration Tool /
Cup Kit 0019-3242), turn the Span Adjust poten-
tiometer until the displayed reading matches the
concentration stamped on the Span Gas Cylinder.
6. Calibration is now complete. Turn off the Regulator
and remove the calibration equipment.
Maintenance
Battery Replacement
Remove slotted screw from rear
of instrument; then lift off front
case.
Replace 9V Alkaline battery
(Duracell MN1604 or equiv.) in
location shown in Figure 3; then
reinstall front case.
Sensor Replacement
The sensor needs replaced when
it can no longer be calibrated to the Span Gas Cylinder
value using the Span Adjust potentiometer, or if it no
longer responds to a CO source.
1. See Figure 4. Remove the screw from the rear of the
instrument; then lift off the front case and remove
the printed circuit board assembly.
2. Unplug the old sensor and remove its gasket. Dis-
card both items properly.
3. Inspect the sensor fi lter. Replace the fi lter if it has
become contaminated with dirt.