The SENVA CT1D-A3X is a CO2 duct sensor that maximizes energy savings by ensuring optimal ventilation. It features a self-calibrating NDIR sensor for high accuracy and a standard solid-state setpoint relay. The probe is non-directional for accurate readings and ease of installation. Dual 4-20mA and 0-10/5 VDC outputs.
Rugged Enclosure
Field replaceable CO2 element for lower total lifetime cost
LCD with menu to confirm readings
Product Highlights
This CO2 duct sensor is easy to install and maintain, has high reliability, and provides high accuracy for improved system performance.
Product Information
Standard Information
Brand: SENVA
Manufacturer Part Number: CT1D-A3X
Country of Origin: USA
Technical Specifications
Power Supply
12-30VDC/24VAC(1), 100mA max.
Analog Outputs
Dual Analog 3-wire 4-20mA and 0-5V/0-10V (2) (jumper)
Output scaling
0 - 2000 or 0 - 5000 ppm (selectable)
Set-point Relay
Programmable Solid-state, 1A @ 30VAC/DC, N.O.
Sensor Performance Type
Non-dispersive Infrared (NDIR)
Accuracy (Standard)
±30ppm, ±3% of reading (400-2000ppm), @-10-50°C, 0-85%RH
±50ppm, ±5% of reading (2000-5000ppm), @-10-50°C, 0-85%RH
±100ppm, ±10% of reading (5000-10000ppm), @ 0-50°C, 0-85%RH
Accuracy (Dual Channel)
±30ppm, ±3% of reading (400-2000ppm), @ 0-50°C, 0-85%RH
±50ppm, ±3% of reading (2000-5000ppm), @-10-50°C, 0-85%RH
±100ppm, ±10% of reading (5000-10000ppm), @ 0-50°C, 0-85%RH
Drift with ABC disabled (standard)
35 ppm/month
Drift with ABC disabled (Dual Channel)
5 ppm/month
Pressure Dependency
+1% reading per kPa (0.143PSI) deviation from nominal (101kPa,14.7PSI)
Response time
60 seconds to 90% reading
Sample rate
1 second
Output update rate
1 second
Element Operating Environment
4 to 122°F (-20 to 50°C), 0 to 95% RH
LCD Menu Setup Parameters SPH, Setpoint, Hi (On point)
500ppm to full-scale (800ppm default)
LCD Menu Setup Parameters SPL, Setpoint, Lo (Off point)