Product Overview

The VQ500 Series is a range of miniature, fully certified, flameproof catalytic combustible gas sensor heads. Optimized for low power consumption, these sensors utilize a pellistor pair to detect combustible gases and vapors, including ammonia, at LEL levels. Thermal conductivity versions are also available for detecting gases with thermal conductivities different from air at % volume concentrations. Designed with an outline identical to modern miniature electrochemical cells, they are ideal for integration into portable instruments. The series offers poison resistance to silicones and hydrogen sulfide, shock resistance, and is certified for hazardous environments (ATEX, IECEx, CSA, UL). Operating temperature range is from -40C to +55C.

Product Attributes

• Brand: SGX
• Product Line: VQ500 Series
• Type: Catalytic Combustible Gas Sensor (4-Series)
• Certifications: ATEX, IECEx, CSA, UL recognised
• Body Material: Stainless Steel
• Poison Resistance: Silicones and Hydrogen Sulfide
• Features: Integral pellistors, Low power, Standard miniature body size, Shock resistant
• Origin: SGX Europe Sp. z o.o. Poland

Technical Specifications

Specification	Details
Mechanical Dimensions	See outline, page 3
Weight	22g
Environmental Temperature Range (Operation & Storage)	-40 to +55 C
Humidity Range (Operation & Storage)	0 to 80% (non-condensing)
Electrical Supply Voltage	3.00 V to 4.25 V (Depending upon type)
Electrical Supply Power	135 mW to 230 mW (Depending upon type)
Performance - Linearity (Catalytic)	Linear up 60%LEL
Performance - Response Time (T90)	< 20 seconds
Performance - Long Term Zero Drift (ZD-S Variants)	<5%LEL / month (based upon a 1 month period)
Performance - Long Term Zero Drift (All other Types)	<5%LEL / month (based upon a 12 month period)
Performance - Long Term Sensitivity Drift (ZD-S Variants)	<5%Full-Scale / month (based upon a 1 month period)
Performance - Long Term Sensitivity Drift (All other Types)	<5% Full-Scale / month (based upon a 12 month period)
Performance - Zero Offset with Temperature (ZD/W Variant Only)	0.2% methane variation between -10C to +40C (compared to 20C reading)
Warranty Period	12 months
Maximum Gas Concentration (VQ546M, VQ546MR)	100%v/v
Maximum Gas Concentration (VQ547TS, VQ548, VQ549)	100%LEL
Product Variants - VQ546M	Operating Voltage: 4.25 0.1 V; Sensor Current: 50 60 mA; Offset: 15 mV; Outline: A; Routine Temp Tested: No; Routine Burn-In: No
Product Variants - VQ546MR	Operating Voltage: 4.25 0.1 V; Sensor Current: 50 60 mA; Offset: 15 mV; Outline: A; Routine Temp Tested: No; Routine Burn-In: No
Product Variants - VQ547TS	Operating Voltage: 3.0 0.1 V; Sensor Current: 40 50 mA; Offset: 30 mV; Outline: A; Routine Temp Tested: No; Routine Burn-In: No
Product Variants - VQ548ZD	Operating Voltage: 3.0 0.1 V; Sensor Current: 67 80 mA; Offset: 20 mV; Outline: B; Routine Temp Tested: No; Routine Burn-In: No
Product Variants - VQ548ZD/W	Operating Voltage: 3.0 0.1 V; Sensor Current: 67 80 mA; Offset: 20 mV; Outline: B; Routine Temp Tested: Yes; Routine Burn-In: No
Product Variants - VQ548ZD-S	Operating Voltage: 3.0 0.1 V; Sensor Current: 67 80 mA; Offset: 20 mV; Outline: B; Routine Temp Tested: No; Routine Burn-In: Yes
Product Variants - VQ549ZD	Operating Voltage: 4.25 0.1 V; Sensor Current: 50 60 mA; Offset: 20 mV; Outline: B; Routine Temp Tested: No; Routine Burn-In: No
Product Variants - VQ549ZD/W	Operating Voltage: 4.25 0.1 V; Sensor Current: 50 60 mA; Offset: 20 mV; Outline: B; Routine Temp Tested: Yes; Routine Burn-In: No
Hazardous Area Installation - Max Output (Po)	Not greater than 2.5 W (for intrinsically safe supply)
Hazardous Area Installation - Max Temperature Rise	Does not exceed 64 C on any external surface
Hazardous Area Installation - Ambient Temperature Range	-40C and +55C

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