U.S. Patent No. 4,315,520
Airtrol Components F-4103 Series spring biased comparators are essentially a regulator with an adjustable bias (positive or negative), and a control or pilot input. Standard units offer a 1:1 ratio, plus or minus the initial bias. Special 3:1 and 5:1 ratio units are also available. Perfect for HVAC applications, and unique control applications requiring a positive or negative offset. Non-rising stem is available with an attractive knob, plain (allowing installation of OEM knobs) or flush for “back panel” installations.
F-4103 Series Spring Biased Comparators
Specifications
| REGULATOR TYPE | Constant Bleed, Relieving |
| WETTED MATERIALS | Polysulfone, Silicone, Stainless steel |
| SUPPLY CONSUMPTION | See Graph |
| MAX SUPPLY | 35 PSI (242 kPa) |
| TEMPERATURE RANGE | 40° – 150° F (4° – 66° C) |
| EFFECT OF SUPPLY VARIATION | < 0.02 PSI (0.14 kPa) per 1 PSI (6.89 kPa) supply change when dead-ended |
| REPEATABILITY | < +/- 0.05 PSI (.35 kPa) |
| DRIFT | < .03 PSI (.21 kPa) after 24 hours |
| RECOMMENDED FILTRATION | 5 micron |
Ordering Information
Note: These comparators require an orifice restrictor in the supply line to perform as specified.
The barbed “P80” and “P85” fittings are optional.
See the following page for schematics: 4103 & 4104-Schematics
