High Temperature Variable Reluctance Sensors

Principles of Operation
Standard Features and Specifications
Standard Models
Custom Models

Explore other types of variable reluctance speed sensors

Variable reluctance speed sensors for extreme high temperature applications. Feature an operating temperature range of -450°F to +850°F and +1000°F intermittently. Standard models are equipped with a flexible stainless steel braided sheath that can withstand exposure to +1000°F. Special materials and construction prevent damage from physical abuse and thermal shock. In addition, all High Temperature magnetic sensors are hermetically sealed.

Standard Features and Specifications

Variable Reluctance (VR) or inductive type (no internal magnet)
Hermetically sealed, heli-arc welded construction
Three (3) foot stainless steel overbraided lead (custom length available upon request)
300 stainless steel housing (locknut included)
Magnet that resists demagnetization
Unique potting that compensates for temperature extremes
Focusing tip (pole piece) which allows greater air gap with no signal loss
Operating temperature range: -450°F to +850°F& +1000°F intermittently
IR leakage: 50 Mohms @ 50 VDC minimum
High signal output
Unconditional six (6) month warranty if used within specifications

Standard Models

Standard Drag High Temp VR Models

Model Number	Mounting Thread (A)	Thread Length (B)	Overall Length (C)	Tip (Length/Dia.) (D)	Resistance (ohms)	Inductance (Henry)	Gauss Strength
PC28-41G	5/8x18	.875	3.1	.031/.100	100	.09	1000
PC28-13G	11/16x24	.563	3.1	.070/.125	120	.10	1050
PC28-45G	3/4x20	1.25	3.1	.070/.125	120	.10	1050

Low Drag High Temp VR Models

Model Number	Mounting Thread (A)	Thread Length (B)	Overall Length (C)	Tip (Length/Dia.) (D)	Resistance (ohms)	Inductance (Henry)	Gauss Strength
PC28-40G	5/8x18	.875	3.1	.031/.100	160	.20	180
PC28-14G	11/16x24	.563	3.1	.070/.125	180	.25	200
PC28-24G	3/4x20	1.25	3.1	.070/.125	180	.25	200

Inductive High Temp Models

Model Number	Mounting Thread (A)	Thread Length (B)	Overall Length (C)	Tip (Length/Dia.) (D)	Resistance (ohms)	Inductance (Henry)	Gauss Strength
PC23-16G	11/16x24	.563	3.1	flushfront	250	1.2	n/a

Notes:

Dimensions in inches
Resistance and inductance specifications +/- 20%
Mounting threads UNF-2A

Custom High Temperature Variable Reluctance Sensors

In addition to the standard models shown above, high temperature VR sensors are available in custom lengths, diameters, configurations, and mounting threads. Custom operating specifications (resistance, inductance, etc). are available, as well as options such as pigtail leads or NPT threading. Additional sensor customization options

We provide custom sensors on a regular basis and are happy to help develop a solution for your application, or a replacement sensor for an existing application. Please contact our engineering department at eng@motionsensors.com or 252-331-2080 to discuss your application requirements.