Model 90 Low Pressure Selector Relay is designed to select the lower of two signal pressures to provide a continuous output pressure to a control device. The Model 90 is recommended for dead end or low flow service in critical applications such as control loops requiring precise, automatic monitoring of signal pressures.
Features
Model 90 Low Pressure Selector Relay
- Small, rugged design - suitable for installation where space is limited
- Soft seat construction assures positive shutoff
- Low selection differential allows precise control of switching function
- Fast response - well suited for control in critical loops
- Automatic switching eliminates manual monitoring of signal pressure
Specifications
Model 90 Low Pressure Selector Specifications
| Parameter | Specification |
|---|---|
| Maximum Signal Pressure | 200 psig (14.0 BAR, 1400 kPa) |
| Minimum Switching Differential | Less than 0.1 psig (0.007 BAR, 0.7 kPa) |
| Maximum Differential Between Signals | 100 psig (7.0 BAR, 700 kPa) |
| Ambient Temperature Range | -40 to +200 °F (-40 to +93.3 °C) |
| Body Material | Aluminum Alloy |
| Diaphragm Material | Dupont Fairprene-coated fabric |
| Trim Material | Brass |
| Product Codes | 9002 J5 (general example shown) |
| Pressure Range Codes | 00 = Model 90 Low Pressure, 10 = Model 91 High Pressure |
| Pipe Size | 2 = 1/4" NPT |
| Options | J = Fluorocarbon Elastomers, U = BSPT (Tapered) |
| Mounting Bracket Kit | P/N 09921 (sold separately) |
Q & A
Model 90 Low Pressure Selector Q & A
+What is the M90 relay used for?
The M90 is a Low-Pressure Selector Relay, designed to select the lower of two signal pressures and provide a continuous output pressure to a control device — useful in dead-end or low-flow applications and precise control loops.
+What type of design and construction does M90 have?
M90 features a small, rugged design, ideal for installations where space is limited. It uses a soft-seat construction to assure positive shutoff.
+How sensitive/precise is the M90 in switching pressures?
It has a low selection differential (switching differential < 0.1 psig / 0.007 bar) — enabling precise control when selecting between two signal pressures.
+What is the maximum signal / output pressure M90 can handle?
The maximum signal (or output) pressure is 200 psig (≈ 14.0 bar / 1,400 kPa).
+What connection types are available?
The standard connection is 1/4" NPT (female); a 1/4" BSPT (female) variant is also listed.
Downloads
Download Rotork Fairchild Model 90 and Model 91 Low/High Pressure Selector Relay Datasheet
Contact us at (855) 737-4714 to learn more or fill out our online form.