Easy Rate Dual Sensor

Easy Rate Dual Sensors offer a simple and inexpensive solution for QCM applications where one crystal may not be enough. A shutter covers a second crystal until it is needed to finish the process. The Easy Rate Dual Sensors uses two in-vacuum cables for easy field replacement.

The compact design of the Easy Rate Dual Sensor requires only 32.5 mm (1.3 in.) of clearance, allowing the sensor and shutter assembly to pass through a standard CF40 nipple.

Easy Rate Dual Sensors are available in standard and right angle orientations, and they can be configured to include a feedthrough with or without bored-through tube fittings.

Note: Easy Rate Dual sensors use 4.8 mm (3/16 in.) outer diameter (OD) water cooling tubes.  They are not compatible with Ultra-Torr equipped Front Load Sensor feedthroughs and require a tubing adapter in order to be welded to a standard feedthrough with 4.8 mm (3/16 in.) OD water cooling tubes.


  • Dual crystals
  • Low in price, high in quality
  • Front load crystal holder
  • Includes crystal shutter
  • Easy installation
  • Available in standard and right angle configurations
  • Sensor / Feedthrough combinations available with or without bored-through tube fittings


Type Easy Rate Dual Sensor
Maximum bakeout temp with no water 130° C
Maximum operating isothermal environment temperature with minimum water flow 400° C
BD-A _ E 1 _ _ Size (maximum envelope without shutter) 3.25 x 9.00 x 3.15 cm (1.28 x 3.55 x 1.24 in.)
BD-B _ E 1 _ _ Size (maximum envelope without shutter) 3.25 x 9.65 x 3.15 cm (1.28 x 3.80 x 1.24 in.)
Water Tubes S-304, 4.76 mm (0.188 in) OD x 0.51 mm (0.020 in.) wall thickness seamless stainless steel tubing
Crystal Exchange Front loading; shutter moves to the side for easy access to the holders
Mounting 1.015 in. ±0.010 in. diameter aperture
Installation Requirements  
Other XIU or Oscillator to match specific controller, solenoid valve assembly 750-420-G1 for shuttered sensors
Feedthrough 2 pass water and 1 pass air 4.76 mm (0.188 in) OD with 2 microdot coaxial connections
Water flow rate Minimum water flow 150-200 cc/min, 30° C max
Water quality Coolant should not contain chlorides as stress corrosion cracking may occur. Extremely dirty water may result in loss of cooling capacity.
Air Air 70-80 psi (gauge) {85-95 psi (absolute)} (5.8-6.5 bar (absolute)) [584-653 kPa (absolute)] Do not exceed 100 psi (gauge) {115 psi (absolute)} (7.9 bar (absolute)) [791 kPa (absolute)]
Body and holder 304 type stainless steel
Springs, electrical contacts Au plated Be-Cu
Water Tubes 4.76 mm (0.188 in) OD seamless stainless steel
Connector (Microdot) Stainless steel, Teflon® and glass insulated
Insulators >99% Al2O3
Wire Tin plated copper
Crystal 0.550 in. (13.97 mm) Diameter
Feedthrough Specifications-1 in. Bolt  
Materials 304 stainless steel, Teflon®, ceramic, beryllium nickel, VITON®
Temperature Operational environment to 300° C with water cooling or 165° C without
Mounting Two #4-40 tapped holes on the back of the sensor body
Feedthrough Specifications-CF40 (2-3/4 in. ConFlat)  
Materials 304 stainless steel, Teflon, ceramic, beryllium nickel
Temperature Operational environment to 450° C with water cooling or 165° C without
Mounting Mates with 2 ¾ in. ConFlat type flanges with 1.375 in. I.D. min.
ERD Configurator


Name Description
Easy Rate Sensor Feedthroughs Easy Rate Sensor Feedthroughs
Easy Rate Dual Sensor
Part Number Description
750-420-G1 Solenoid Valve, 24V (for use with shuttered and multi-crystal sensors)


Name Description
Quartz Monitor Crystals Quartz Monitor Crystals

Spare Parts

Easy Rate Dual Sensor
Part Number Description
784-205-G1 Crystal Retainer Assembly
784-403-P1 Crystal Finger Spring
784-204-G1 Crystal Holder Assembly
784-404-P1 Retaining Ring
784-300-P1 Crystal Holder
784-405-P1 Holder Finger Spring
750-174-P2 Female coax
080-011-P3 SCREW 0-80 x .125 LG SLOT PAN HD SS GP
080-013 #0-80 Split washer
784-206-G1 Easy Rate Sensor Actuator Assembly
784-203-G1 Easy Rate Right Angle Dual Sensor Head
784-306-P1 Easy Rate Sensor Actuator Clamp
084-054 #4 Split lock washer
084-027 Socket Screw
784-307-P1 Easy Rate Dual Sensor Shutter
783-500-023 In-vacuum cable, 25.4 cm (10 in.)
783-500-024 In-vacuum cable, 76.2 cm (30 in.)
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