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Thermo Fisher Scientific

Checking the Vios TC Co2 sensor for functionality

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Issue

Checking the TC Co2 sensor for functionality

Environment

Vios 160i

160i

250i

Resolution

Connects at Con X18 at main board
• Open cell; (red wires)
• Closed cell; (white wires)
• Con X18
• Supply voltage; 5 VDC at pin 1
• Ground; pin 4
• Open cell signal; pin 2
 Approx 2.5 VDC
• Closed cell signal; pin 3
 Approx 2.5 VDC
• Measure resistance of temp sensors (red to red) / (white to white)
• When inspecting for drift allow sensor to stabilize before measuring
• Inspect bare metal wire leads for possible short condition
• Check for corrosion/blockage at sintered filter
• Clean with 70% alcohol

Open cell failure;
• Electrical open = approx 50% displayed
• Electrical short = approx -75% displayed
• Closed cell failure;
• Electrical open = approx -75% displayed
• Electrical short = approx 50% displayed
• If CO2 set-point is > 0.0%,… ( - - - ) is displayed after 60 Sec.
• Must reboot to clear “CO2 sensor breakage” error.

Con X18, pin 2 (Open cell);
• Electrical open = 0 VDC / Display = high value
• Electrical short = 5 VDC / Display = low value
• Con X18, pin 3 (Closed cell);
• Electrical open = 5 VDC / Display = low value
• Electrical short = 0 VDC / Display = high value