SENVA CT1W Room CO2 and CO2 T Transmitters Installation Guide
- June 1, 2024
- SENVA
Table of Contents
SENVA CT1W Room CO2 and CO2 T Transmitters
Specifications
- Product Name: CT1W Select Series Room CO2 & CO2/T Transmitters
- Output Options: 0-10V, 0-5V
- Temperature Range: 10-35°C, 0-50°C
- Calibration Range: +/-250ppm
- Factory Calibration: Controlled test gases
Product Usage Instructions
Installation
- Locate the sensor away from ventilation sources and heat-generating equipment.
- Mount the sensor at light switch height in a vertical orientation.
- Avoid installing the sensor in multi-gang electrical boxes with line voltage or other electrical devices.
Operation
Press the MENU button to cycle between different settings:
- SCL: Scaling options for ppm levels
- SPH: Setpoint High
- SPL: Setpoint Low
- ADJ: Manual calibration adjustment
- CAL: Automatic calibration – ON/OFF
Use the arrow buttons to adjust settings and view current values.
Calibration
The sensor features automatic calibration to track low ambient CO2 levels
and compensate for drift. Field calibration is not necessary but can be done
for compliance purposes:
- Locate calibration instrument and sensor in a controlled environment.
- Compare sensor output to calibration instrument (1V = 200ppm).
FAQ
-
Q: Is field calibration required for the CT1W sensor?
A: Field calibration is not necessary as the sensor comes factory calibrated to controlled test gases. However, provisions for field calibration are provided for compliance purposes. -
Q: How do I lock/unlock the lid of the device?
A: To lock the lid, push in the tabs on the back of the device while applying pressure to keep the lid in place until locks click into place. To unlock, use a small screwdriver in the designated vent to release the lock.
INSTALLATION INSTRUCTIONS
CT1W Select Series
Room CO2 & CO2/T Transmitters
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 sensor in an area away from ventilation sources and heat generating equipment and appliances. Sensor should be mounted at light switch height in a vertical orientation. Use insulating material behind sensor to ensure reading accuracy.
NOTE : Do not install sensor in multi-gang electrical boxes with line voltage or other electrical devices.
-
Wire sensor as shown above.
-
Set DIP switch positions on (front of device) to accommodate your application. DIP switch 2 only applies to units with transmitter temperature output selected.
-
Apply power to sensor.
OPERATION
Press 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
senvainc.com 1-866-660-8864 (F)1-503-296-2529 1825 NW 167th Pl. Beaverton Oregon 97006
FEATURE – LID LOCKS
The CT1W comes standard with locks to keep the lid from being removed, to stop unwanted tampering. There is a Lock located at all 4 lid snaps.
CALIBRATION
Automatic Calibration feature
The sensor will automatically track low ambient CO2 levels and gradually make
adjustments to compensate for sensor drift due to long-term aging of the IR
light source.
Senva CO2 sensors are factory calibrated to controlled 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 instrument and sensor in close proximity to each other in a controlled environment free of drafts, peo-ple, and equipment to reduce influence on CO2 and tempera-ture.
- Compare output of sensor to calibration instrument, and note difference. (In 0-10V mode/2000ppm range, 1V =200ppm)
- Using the buttons on front of unit, adjust offset value for CO2 as needed. Factory calibration may be restored by setting offset back to 0.
In extreme cases where the sensor module has been damaged, a new module may be installed in the field. Consult factory for replacement module and instructions.
TROUBLESHOOTING
TROUBLESHOOTING
Symptom| Solution
No output| Check wiring. Ensure power supply meets requirements.
CO2
reading error
| Verify control panel software is configured for correct output scaling.
Verify accuracy of test instrument. Observe installation and calibration
guidelines
Install insulation foam gasket provided to pre- vent thermal conduction from
inside wall.
Perform calibration only if necessary.
SPECIFICATIONS
| AC Supply | 24VAC (1) 100mA max |
|---|---|
| DC Supply | 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
Drift with ABC disabled (Standard)| 35ppm/month (3)
Drift with ABC disabled
(Dual Channel)
|
5ppm/month (3)
Range| 0-2000/5000ppm;
Programmable up to 10,000ppm
Response time| 60s to 90% reading
Output update rate| 1s
Element Operating Environment(4)| 14 to 122ºF (-10 to 50ºC), 0 to 95% RH
Temperature Transmitter
Accuracy| <±0.2oC
Resolution| 0.01oC
Repeatability| 0.04oC
Response time| 2s
Output update rate| 0.5s
Element Operating range| -40 to 140oF (-40 to 60oC)
Environmental
Enclosure Rating| IP20/NEMA 1
Max Operating Temp| 14 to 122oF (-10 to 50oC)
Compliance
Agency| CE, RoHS
- One side of transformer secondary is connected to signal common. 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 continously occupied spaces or greenhouses. Drift ratings may vary based on environment.
- Operation outside of element operating environment may result in reduced accuracy.
Revised 12/5/2023 Document #152-0410-0C