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 for detecting combustible gases and % volume gases via thermal conductivity. With an outline identical to modern miniature electrochemical cells, they are ideal for portable instruments. The series offers specific sensors for various combustible gases, vapors, and ammonia at LEL levels, as well as thermal conductivity versions for gases with different thermal conductivities than air. Variants are available with specific testing for temperature performance and enhanced stability through burn-in.

Product Attributes

• Brand: SGX
• Product Line: VQ500 Series
• Sensor Type: Catalytic Combustible Gas Sensor (4-Series)
• Certifications: ATEX, IECEx, CSA, UL Recognised
• Explosion Proof Component: Yes
• Poison Resistance: Silicones and Hydrogen Sulfide
• Body Material: Stainless Steel
• Origin: Poland

Technical Specifications

Specification	Details
Operating Temperature Range	-40C to +55C
Storage Temperature Range	-40C to +55C
Humidity Range (Operation & Storage)	0 to 80% (non-condensing)
Supply Voltage	3.00 V to 4.25 V (Depending upon type)
Supply Power	135 mW to 230 mW (Depending upon type)
Weight	22g
Response Time (T90)	< 20 seconds
Long Term Zero Drift (ZD-S Variants)	<5%LEL / month (1 month period)
Long Term Zero Drift (All other Types)	<5%LEL / month (12 month period)
Long Term Sensitivity Drift (ZD-S Variants)	<5%Full-Scale / month (1 month period)
Long Term Sensitivity Drift (All other Types)	<5% Full-Scale / month (12 month period)
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 Marking (ATEX)	II 2G Ex db IIC Gb I M2 Ex db I Mb Ta -40C to +55C, Pi: 2.5 W
Product Marking (IECEx)	Ex db IIC Gb Ex db I Mb Ta -40C to +55C, Pi: 2.5 W
Model: VQ546M	Operating Voltage: 4.25 0.1 V; Sensor Current: 50 60 mA; Offset: -4.0 (1% Methane) 15 mV; Poison Resistance: Not Required; Routine Temperature Tested: No; Routine Burn-In and Drift Test: No; Outline: A; Description: Low Power, Thermal Conductivity Sensor, methane. Negative output.
Model: VQ546MR	Operating Voltage: 4.25 0.1 V; Sensor Current: 50 60 mA; Offset: +4.0 (1% Methane) 15 mV; Poison Resistance: Not Required; Routine Temperature Tested: No; Routine Burn-In and Drift Test: No; Outline: A; Description: Low Power, Thermal Conductivity Sensor, methane. Positive output.
Model: VQ547TS	Operating Voltage: 3.0 0.1 V; Sensor Current: 40 50 mA; Minimum Sensitivity: 21 (1.5% Ammonia) mV; Offset: 30 mV; Poison Resistance: Some; Routine Temperature Tested: No; Routine Burn-In and Drift Test: No; Outline: A; Description: Low Power, LEL Ammonia Sensor.
Model: VQ548ZD	Operating Voltage: 3.0 0.1 V; Sensor Current: 67 80 mA; Minimum Sensitivity: 20 (1% Methane) mV; Offset: 20 mV; Poison Resistance: Silicones & H2S; Routine Temperature Tested: No; Routine Burn-In and Drift Test: No; Outline: B; Description: Low Power, LEL methane sensor, silicone poisoning, H2S and Shock Resistant.
Model: VQ548ZD/W	Operating Voltage: 3.0 0.1 V; Sensor Current: 67 80 mA; Minimum Sensitivity: 20 (1% Methane) mV; Offset: 20 mV; Poison Resistance: Silicones & H2S; Routine Temperature Tested: Yes; Routine Burn-In and Drift Test: No; Outline: B; Description: Low Power, LEL methane sensor, silicone poisoning, H2S and Shock Resistant.
Model: VQ548ZD-S	Operating Voltage: 3.0 0.1 V; Sensor Current: 67 80 mA; Minimum Sensitivity: 20 (1% Methane) mV; Offset: 20 mV; Poison Resistance: Silicones & H2S; Routine Temperature Tested: No; Routine Burn-In and Drift Test: Yes; Outline: B; Description: Low Power, LEL methane sensor, silicone poisoning, H2S and Shock Resistant.
Model: VQ549ZD	Operating Voltage: 4.25 0.1 V; Sensor Current: 50 60 mA; Minimum Sensitivity: 30 (1% Methane) mV; Offset: 20 mV; Poison Resistance: Silicones & H2S; Routine Temperature Tested: No; Routine Burn-In and Drift Test: No; Outline: B; Description: Low Power, LEL methane sensor, silicone poisoning, H2S and Shock Resistant.
Model: VQ549ZD/W	Operating Voltage: 4.25 0.1 V; Sensor Current: 50 60 mA; Minimum Sensitivity: 30 (1% Methane) mV; Offset: 20 mV; Poison Resistance: Silicones & H2S; Routine Temperature Tested: Yes; Routine Burn-In and Drift Test: No; Outline: B; Description: Low Power, LEL methane sensor, silicone poisoning, H2S and Shock Resistant.

2404071845_Amphenol-VQ549ZD-W_C3659382.pdf