SENVA CT1W Select Series Room CO2 Transmitters Owner’s Manual

: June 10, 2024
: SENVA

Table of Contents

SENVA CT1W Select Series Room CO2 Transmitters
Product Information
Product Specifications
Important Warnings
Product Usage Instructions
Operation
INSTALLATION INSTRUCTIONS
PRODUCT APPLICATION LIMITATION
INSTALLATION
OPERATION
DIMENSIONS
SPECIFICATIONS
CALIBRATION
References
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SENVA CT1W Select Series Room CO2 Transmitters

Product Information

The CT1W Select Series Room CO2 & CO2/T Transmitters from Senva are devices designed to measure CO2 levels in a room or enclosed space. The device uses a non-dispersive infrared (NDIR) sensor to detect the concentration of CO2 in the air. The device comes with a relay output and supports 0-5V, 0-10V, or 4-20mA analog outputs.

Product Specifications

Power Supply: 24VAC (1) 100mA max / 12-30VDC, 50mA max
Outputs: CO2 and Temperature (option), Relay, 3-wire 4-20mA, 0-5V or 0-10V (2) (selectable)
Solid state, 1A@30VAC/DC, N.O.
Output scaling: CO2 – 0-2000ppm (default), 0-5000ppm or 10,000ppm (selectable)
Accuracy (Standard): CO2 Sensor Performance
Accuracy (Dual Channel): Drift with ABC disabled (Standard) – 35ppm/month (3)
Drift with ABC disabled (Dual Channel): Range – 5ppm/month (3)
Response time: 60s to 90% of reading
Output update rate: 1s
Operating Environment(4)

Important Warnings

Senva products are not designed for life or safety applications. Senva products are not intended for use in critical applications such as nuclear facilities, human implantable device or life support. Senva is not liable, in whole or in part, for any claims or damages arising from such uses.

Product Usage Instructions

Installation

Locate the sensor in an area away from ventilation sources and heat-generating equipment and appliances. The sensor should be mounted at light switch height in a vertical orientation. Use insulating material behind the sensor to ensure reading accuracy.
Do not install the sensor in multi-gang electrical boxes with line voltage or other electrical devices.
For best results, install the sensor in a good location as shown in the manual.
Wire the sensor as shown in the manual.
Set DIP switch positions on (the front of the device) to accommodate your application. DIP switch 2 only applies to units with transmitter temperature output selected.
Apply power to the sensor.

Operation

Press the center MENU button to cycle between the following options:

SCL Scaling 2 = 2000ppm, 5 = 5000ppm, 10 = 10000ppm
SPH Setpoint, Hi (Closed above this level)
SPL Setpoint, Lo (Open below this level)
ADJ Manual calibration adjustment +/-250ppm
CAL *Automatic calibration – ON/OFF

The upper arrow and lower arrow will show the current setting and then adjusted values on consecutive presses. For No Display, the output is set to 0-2000ppm and ABC is ON. For continuously occupied areas or greenhouses, it is recommended to turn automatic calibration to ‘off’. CT1R-XXX-D (Dual Channel CO2) products will have calibration ‘off’ by default.

INSTALLATION INSTRUCTIONS

IMPORTANT WARNINGS

Only qualified trade installers should install this product
This product is not intended for life-safety applications
Do not install in hazardous or classified locations
The installer is responsible for all applicable codes
De-energize power supply prior to installation or service

PRODUCT APPLICATION LIMITATION

Senva products are not designed for life or safety applications. Senva products are not intended for use in critical applications such as nuclear facilities, human implantable device or life support. Senva is not liable, in whole or in part, for any claims or damages arising from such uses.

INSTALLATION

IMPORTANT! Locate the sensor in an area away from ventilation sources and heat-generating equipment and appliances. The sensor should be mounted at light switch height in a vertical orientation. Use insulating material behind the sensor to ensure reading accuracy.

NOTE: Do not install sensors in multi-gang electrical boxes with line voltage or other electrical devices.

SENVA-CT1W-Select-Series-Room-CO2-Transmitters-fig-1

SENVA-CT1W-Select-Series-Room-CO2-Transmitters-fig-2

Wire sensor as shown above.
Set DIP switch positions on (the front of the device) to accommodate your application. DIP switch 2 only applies to units with transmitter temperature output selected.

SENVA-CT1W-Select-Series-Room-CO2-Transmitters-fig-3

Apply power to the sensor.

OPERATION

Press the center MENU button to cycle between:

SCL Scaling “2” = 2000ppm, “5” = 5000ppm, “10” = 10000ppm
SPH Setpoint, Hi (Closed above this level)
SPL Setpoint, Lo (Open below this level)
ADJ Manual calibration adjustment +/-250ppm
CAL *Automatic calibration – ON/OFF

The upper arrow and lower arrow will show the current setting and then adjusted values on consecutive presses.

For No Display, the output is set to 0-2000ppm and ABC is ON
For continuously occupied areas or greenhouses, it is recommended to turn automatic calibration to ‘off’.
CT1R-XXX-D (Dual Channel CO2) products will have calibration ‘off’ by default.

DIMENSIONS

SPECIFICATIONS

Power supply	AC Supply/DC Supply	24VAC (1) 100mA max / 12-30VDC, 50mA max
Outputs	CO2 and Temperature (option)	3-wire 4-20mA, 0-5V, or 0-10V (2)

(selectable)
Relay| Solid state, 1A@30VAC/DC, N.O.
Output scaling| CO2| 0-2000ppm (default), 0-5000ppm or 10,000ppm (selectable)

CO2 Sensor Performance

| Type| Non-dispersive Infrared (NDIR)

Accuracy (Standard)

| ±(30ppm +3% of reading) (400-2000ppm), @-10-50°C

±(50ppm +5% of reading) (2000-5000ppm), @-10-50°C

±(100ppm+10% of reading) (5000-10000ppm), @ 0-50C

Accuracy (Dual Channel)

| ±(30ppm+3% of reading) (0-2000ppm), @ 0-50C

±(50ppm+3% of reading) (2000-5000ppm), @ -10-50C

±(100ppm+10% of reading) (5000-10000ppm), @ 0-50C

One side of the transformer secondary is connected to the signal common. A dedicated transformer is recommended.
15-30VDC/24VAC power supply voltage required for 10 Volt output.
It is not recommended to de-activate ABC (auto-calibration) except for continuously occupied spaces or greenhouses. Drift ratings may vary based on the environment.
Operation outside of the element operating environment may result in reduced accuracy.

CALIBRATION

Automatic Calibration feature
The sensor will automatically track low ambient CO2 levels and gradually make adjustments to compensate for sensor drift due to the long-term aging of the IR light source.
Senva CO2 sensors are factory calibrated to control test gases. No field calibration is necessary or recommended. However, to facilitate compliance with job requirements and commissioning procedures, provisions for field calibration are provided:

Locate calibration instruments and sensors in close proximity to each other in a controlled environment free of drafts, people, and equipment to reduce the influence on CO2 and temperature.
Compare the output of the sensor to the calibration instrument, and note the difference. (In 0-10V mode/2000ppm range, 1V =200ppm)
Using the buttons on the front of the unit, adjust the offset value for CO2 as needed. Factory calibration may be restored by setting the offset back to 0.

In extreme cases where the sensor module has been damaged, a new module may be installed in the field. Consult the factory for replacement modules and instructions.

TROUBLESHOOTING

Symptom| Solution
No output| Check wiring. Ensure the power supply meets requirements.

CO2

reading error

| Verify control panel software is configured for correct output scaling.
Verify the accuracy of the test instrument. Observe installation and calibration guidelines
Install the insulation foam gasket provided to prevent thermal conduction from the inside wall.
Perform calibration only if necessary.

senvainc.com 1-866-660-8864 (F)1-503-296-2529 9290 SW Nimbus Ave. Beaverton Oregon 97008