G502 Small angle rotary sensor

Intrinsically safe rotary sensor for hazardous gas/vapour atmospheres with small angle measurement.

Key features

Intrinsically safe for Zone 0 / Class I Division 1
Factory-set angle range: 5° to 15° (custom)
Non-contact inductive technology (wear-free)
Infinite resolution, high accuracy and stability
Stainless steel housing, IP65/IP67 sealed
Low torque (<20 mNm) and long service life
Flange or servo mounting options

Performance highlights

The G502 is a compact, intrinsically safe rotary position sensor designed for hazardous gas/vapour environments (CSA-approved: Class I, Zone 0, Division 1). It delivers superior resolution at small angles of deflection compared to the G500, making it ideal for applications requiring precision over limited rotational ranges. The output is factory calibrated to a customer-defined angle between 5° and 15°, with a proportional linear output (0.5–4.5 V ratiometric) and full EMC protection.

Usage conditions

With a rugged stainless steel body (Ø35 mm, 44 mm length) and IP65/IP67 sealing, the G502 withstands extreme environments. It operates reliably from -40°C to +80°C, with high resistance to vibration (10 g) and shock (40 g). The sensor is certified to EX ia IIC T4 Ga standards, ensuring safe operation in explosive gas atmospheres.

Applications:

Valve position feedback in petrochemical plants
Small angle feedback for actuators in EX zones
Test rigs in hazardous areas
OEM machinery requiring compact rotary sensing
Servo systems in ATEX-certified environments

Why choose the G502?

The G502 combines precision, durability, and intrinsic safety:

Infinite resolution, excellent repeatability
Frequency response >10 kHz
Optional spring return shaft (up to 100°)
Compatible with Althen’s G005 Galvanic Isolation Amplifier for certified safe use
Service life >16 million cycles under load

Do you need this sensor for your next project?

Request a no-obligation quote or send us your contact details for a free, no-obligation consultation. Our sales engineers will then contact you within a maximum of 1 to 2 working days.

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Technical Specifications

Specification	Value
Angle range (factory set)	5°–15° (customer-defined)
Linearity	≤ ±0.25% FSO @ 20°C
Resolution	Infinite
Output	0.5–4.5 V ratiometric (EX08)
Frequency response	>10 kHz (-3 dB)
Torque	<20 mNm static
Noise	Noise
Supply voltage	+5 V (4.5–5.5 V), 10 mA nominal, 12 mA max
Load resistance	≥ 5 kΩ
Intrinsic safety classification	EX ia IIC T4 Ga (Zone 0 / Div 1)
Operating temperature	-40°C to +80°C
Storage temperature	-40°C to +125°C
Shock resistance	40 g (IEC 68-2-29)
Vibration resistance	10 g (IEC 68-2-6)
Sealing	IP65/IP67 (depending on connector/cable option)
MTBF	350,000 hrs @ 40°C
Body size	Ø35 mm x 44 mm
Shaft	Ø6 mm, 15 mm long
Mounting	Flange (default) or servo mount