Product Overview

DWYER INSTRUMENTS, INC. | dwyer-inst.com212
Fume Hood Monitors/
Air Flow Switches
AIR QUALITY
FUME HOOD MONITOR
Ensures Proper Fume Hood Performance
The Model 670 Fume Hood Monitor continuously senses air ow through the face
of the fume hood, ensuring safe levels of fresh air are exhausting. The 670 provides
a highly accurate hot wire sensor to detect very low ows common on fume hoods.
The Model 670 comes with everything required to quickly install the unit including a
mounting bracket, 24˝ of tubing for connecting to the inside of the hood wall and a 120
Volt AC power adapter.
FEATURES/BENEFITS
• Flexible surface or ush mounting
• LED safe and alarm status indicators
• Audible alarm
• Sash alarm input
• Night time set-back
APPLICATIONS
• Fume hood ventilation monitoring
3-29/64 [87.88]
2-1/64 [51.05]
13/64
[5.08]
1-1/16
[27.10]
5-45/64
[145.03]
4-61/64
[125.98]
4-9/16
[116.08]
3-17/64 [83.06]
SPECIFICATIONS
Service: Fume hood face velocity air ow.
Alarm Range: 30-400 FPM (0.15-2.0 m/s).
Alarm Indication: Red LED and audible alarm.
Low Air Velocity Alarm Delay: Fixed 5 s.
Visual LED Display: Red: Alarm; Green: Normal.
Horn Silence: Yes-temporary and permanent.
Accuracy: Face velocity ±10%.
Temperature Limits: Operating temperature: 55 to 86°F (13 to 30°C); Storage
temperature: -40 to 150°F (-40 to 65°C).
Power Requirement: 15 VDC 500 mA; 120 VAC, 60 Hz power transformer
included.
Relay Output Low Air Flow Alarm: 5 A @ 250 VAC.
Relay Input For Night Setback: 2 wire rated for 24 VDC usage.
Sash High Indication: Using a two wire micro switch or 3 wire proximity switch
input, rated for 24 VDC usage.
Mounting: Semi ush, ush or surface mounted when using included bracket.
Weight: 5.0 oz (141 g).
ADJUSTABLE AIR FLOW PADDLE SWITCH
Ranges from 200 to 1800 FPM, Stainless Steel Vane, ABS Housing
The Model AAFS Adjustable Air Flow Paddle Switch is capable of detecting a wide
range of air velocities with minimal user calibration. Quality features include a stainless
steel vane, galvanized steel base, and ABS enclosure.
FEATURES/BENEFITS
• Adjustable air ow sensitivity from 200 to 1800 FPM
• High current (15 A) rated SPDT contact
• IP65 enclosure rating
APPLICATIONS
• Air ow proving in HVAC systems
5.94
[151.00]
2.81
[71.50]
M18X1.5
PROCESS
CONNECTION
3.86
[98.00]
4.92
[125.00]
3.15
[80.00]
1.02
[26.00]
4.15
[105.50]
2.56
[65.00]
2.81
[71.50]
0.49
[12.50]
6.89
[175.00]
3.86
[98.00]
3.03
[77.00]
4.02
[102.00]
3.46
[88.00]
2.56
[65.00]
2.52
[64.00]
Ø0.20
[Ø5.00]
SPECIFICATIONS
Service: Air and compatible gas.
Wetted Materials: Vane: SS; Lever: Brass; Base: Galvanized steel.
Housing: ABS.
Temperature Limits: Ambient: -40 to 180°F (-40 to 85°C); Process: -14 to 185°F
(-10 to 85°C).
Humidity Limits: 10 to 90%, non-condensing.
Switch Type: SPDT.
Electrical Rating: 15 (8) A @ 250 VAC.
Electrical Connection: Screw terminal with M18 x 1.5 cable gland.
Process Connection: Flange.
Mounting Orientation: Horizontal duct ow.
Set Point: Internal screw.
Enclosure Rating: IP65.
Weight: 13.6 oz (380 g).
Agency Approvals: CE.
MODEL 670
MODEL AAFS
USA: California Proposition 65
WARNING: Cancer and Reproductive Harm - www.P65Warnings.ca.gov
MODEL CHART
Model Description
670 Fume hood monitor
MODEL CHART
Model Description
AAFS Adjustable air ow paddle switch
AirQuality_2021.indb 212 7/15/20 12:17 PM