CO2Meter com TR250Z Oxygen Sensor User Manual
- October 30, 2023
- CO2METER COM
Table of Contents
TR250Z Oxygen Sensor
User Manual
TR250Z Oxygen Sensor
Models
- CM‐0134 25% O2 Transmitter
- CM‐0134‐ WT 25% O2 Transmitter with Tube Sampling
- CM‐0150 25% O2 with Mount Shield
- CM‐0160 95% O2 Transmitter
- CM‐0160‐WT 95% O2 Transmitter with Tube Sampling
- CM‐0161 95% O2 with Mount Shield
Welcome
Thank you for purchasing the TR250Z Oxygen Sensor. The TR250Z is a long life
25% or 95% oxygen level transmitter that provides multiple analog linear
outputs of O2 concentrations. It’s designed to be a rugged, maintenance‐free
addn for OEMs or can be used as a desktop device.
In addition, it can be calibrated in normal air, or can use a calibration gas
of any known oxygen concentration.
Our goal is to make high‐quality, low‐cost gas detection and indoor air
quality products available to you.
Please take some time to read through this manual in order to get the most out
of your meter.
Make sure to visit our website regularly to find more information about this
product and to download the software free. Once you download and install the
software, you can use the “ Check for updates” function under the Help menu to
search for new updates. Please also pay special attention to the important
safeguards shown on the pages ahead.
Important Safeguards
To reduce the risk of fire, electrical shock and/or injury to persons, basic safety precautions should always be followed when using electrical appliances, including the following:
- READ ALL INSTRUCTIONS BEFORE USING THIS DEVICE!
- Use only the supplied power supply to operate the unit.
- Ensure that when sampling in a closed environment that the tubes are securely fashioned to the device.
- Do not operate with a blocked off sample path.
- Do not operate the device if it is malfunctioning.
- Do not install the device outside in exposed conditions. Due to the nature of the design the enclosure cannot be made wateright and the unit must not be exposed to water.
- Do not operate the device with the cover detached.
SAVE THESE INSTRUCTIONS!
Package Contents
Please verify that your package contains the following items before using the
unit:
Contents:
- (1) Meter
- (1) Certificate of Calibration
- (1) User Manual
- (1) Power supply
- (1) 2 Meter USB to RS‐485 Cable
- (1) Screen Breather
Software
Our free Gaslab® software lets you automate the calibration process as well as
log data. While it is not required to use the sensor, you may find it useful.
To install Gaslab, go to the “Downloads” page (see link below) at
CO2Meter.com. For general information about the
software, refer to the GasLab® User Manual.
http://www.co2meter.com/pages/downloads
IMPORTANT: YOU MUST INSTALL THE SOFTWARE BEFORE CONNECTING YOUR DEVICE
TO YOUR COMPUTER
By installing the software first, you will ensure that the proper drivers are
automatically installed on your computer when you plug in the USB device for
the first time.
Minimum System Requirements
To utilize our free software, your computer must meet the following requirements:
- Windows XP SP3 or higher
- Microsoft .Net Framework 3.5 SP1
- Pentium 4 (or newer) operating at 2.4Ghz or faster
- 1GB of Random Access Memory (RAM)
- Hard disk space with at least 20 Megabytes (MB) free (200+MB recommended for logs and application files)
Software is compatible with 64‐bit operating systems and is fully tested with
Windows.
To install Gaslab, click on the “Install Now” link and then select “Run” when
prompted by your browser (as shown on Error! Reference source not found.).
Follow the steps and instructions prompted by your computer’s operating
system. Make sure you have administrator privileges in order to install this
program. 
Descriptions
Display – Main interface to view current sensor readings and menu state.
Will blink “STRT” upon applying power while the sensor warms up and
stabilizes.
LEDs – are in for lower right corner of the unit on the main PCB and are
labeled S, E and P.
S LED – Status LED. Blinks every time a complete measurement cycle is
performed and the value is updated. Serve’s as a heartbeat for transmitter
operation.
E LED – Error LED. Will light if any abnormal conditions are
detected within the device, primarily the sensor falling out of its
recommended operating specifications will trigger this lamp.
P LED – Power LED. Will be on continuously when power is applied to the
unit.
Buttons ‐ The unit has three surface mount buttons above the LEDs on the
PCB. They can be gently and carefully pressed with your finger. These buttons
allow you to access all aspects of sensors operation and test or calibrate
different functional modules.
Theory of Operation
The zirconia oxygen sensor utilizes solid‐state electrochemical reactions
to produce a voltage proportional to the current oxygen. This voltage is then
digitalized and filtered to a usable value. The oxygen sensor has also been
factory calibrated to meet specifications.
Standard Operation
The O2 transmitters comes factory calibrated for easy installation. During its
life cycle calibration may become periodically necessary. We recommend
performing a span O2 calibration every month for guaranteed operation and
ensured accuracy. No other calibration is necessary during the life cycle of
the sensor.
Terminal Connectors
- VDC = G‐ G+
- O2 4‐20mA = SIG GND
- RS‐485 INTERFACE = A B GND
- RESET = RST
Powering the Unit
The unit can be powered by hardwiring 24 VDC power through the MDCM‐4FP‐2M
Cable (included) but sampling units can also be powered by the included 24VDC
International wall power supply.
0-10V Output (Optional)
To get a 10 volt span (2‐10 volt in practice) from a 4‐20 mA line, add a 500
ohm resistor from signal to ground. 500 ohms x .004 amps = 2 volts and 500
ohms x .020 amps = 10 volts.
Install the resistor at the receiving end, as this eliminates all voltage
drops from resistance in the wire.
4‐20mA and 2‐10V are used so it can be determined if the transmitter is
actually present. Less than 4mA or 2V: no transmitter, not connected or no
signal.
LCD Display
The Liquid Crystal Display (LCD) screen shows the following features:
- CO2 in percentage format (##.##%) for 100%
Calibration
The calibration process varies depending on the type of unit and whether it
has optional data logging functionality or not. All units are
factory‐calibrated with multiple reference points of gas, and have been
verified to be accurate within their specific functionality before shipment.
However, if the unit is severely jolted or otherwise mechanically disturbed,
the sensor can drift requiring recalibration. All calibration procedures
follow a single‐point calibration routine that effectively shifts the
zero‐point of the O2 sensor.
Calibration may be performed via MODBUS, manually, or by a USB connection to a
PC running GasLab® software.
Calibrating using MODBUS
Calibration via MODBUS requires an RS‐485 cable and assumes knowledge of
proper coding. Register values are listed at the end of this manual.
Calibrating using Gaslab
Install the Gaslab software first, then connect the sensor to your PC using a
standard mini‐USB cable.
Calibration can be performed using either 0% CO2 calibration gas (typically
nitrogen) or using a fresh source of air, assumed to be approximately 20.9%
O2.
Follow the on‐screen prompts specific to your sensor to perform the
calibration.
Manual Calibration
Manual calibration is performed using the 3 on‐board buttons and the
service menu on the display. To enter the service menu the buttons must be
pressed in a factory‐set order. This code can be customized before shipment
but by default will be 1‐2‐3. The buttons must be pressed within a half second
of each other, or the unit will return to standard operating mode. When in the
service menu the unit will not update the current O2 readings. Once you enter
the menu the display will read “1234” or for 1 second, then the Product
Identification Code will be displayed. This code is important, as it will
identify which manual calibration procedure below you should use.
Product Identification Code
After pressing buttons 1‐2‐3, the unit will display “1234”, followed by a
4‐digit Product Identification Code (PIC). You must know your sensor’s PIC to
properly calibrate.
- If the PIC is “1195” or “1225”, follow the 1195/1225 Calibration Procedure
- If the PIC is “1295” or “1395”, follow the 1295/1395 Calibration Procedure
1195/1225/1425 Calibration
Procedure Fresh Air Calibration
- Allow sensor to stabilize for at least 1 hour
- Ensure the sensor is exposed to fresh air
- Press 123 to enter the service menu. The display will flash 1234 and the PIC
- Press 2 to enter the Oxygen submenu
- Press 2 again to start the calibration
- Press 3 to Save.
Note: Steps 3‐6 must be done quickly or the sensor will exit the calibration mode. You can minimize this by remembering the sequence 123223 to perform manual fresh air calibration.
Zero Point Calibration using 100% Nitrogen
- Allow sensor to stabilize for at least hour
- Apply 100% Nitrogen Calibration Gas to Sensor
- Wait 5 minutes for stable readings
- Press 123 to enter service menu. The display will flash 1234 and the PIC
- Press 2 to enter the Oxygen submenu
- Press 1 to calibrate to 100% Nitrogen
- Press 3 to Save. No numbers will be displayed until the sensor is exposed to oxygen again
Note: Steps 4 ‐ 7 must be done quickly or the sensor will exit the
calibration mode. You can minimize this by remembering the sequence 123213 to
perform manual fresh air calibration.
1295/1395/1495 Calibration
Procedure Fresh Air Calibration
- Allow sensor to stabilize for at least 1 hour
- Ensure the sensor is exposed to fresh air
- Press 123 to enter the service menu. The display will flash 1234 and the PIC
- Press 2 to enter the Oxygen submenu
- Press 1 to start the calibration
- Press 3 to Save.
Note: Steps 3‐6 must be done quickly or the sensor will exit the
calibration mode. You can minimize this by remembering the sequence 123213 to
perform manual fresh air calibration.
Span Calibration using 70% Oxygen (optional)
To perform a span calibration, only 70% oxygen gas can be used. If you do not
have 70% O2 test gas, do not attempt a span calibration.
- Allow sensor to stabilize for at least hour
- Apply 705 Oxygen Calibration Gas to Sensor
- Wait 5 minutes for stable readings
- Press 123 to enter service menu. The display will flash 1234 and the PIC
- Press 2 to enter the Oxygen submenu
- Press 2 to calibrate to 70% Oxygen
- Press 3 to Save. No numbers will be displayed until the sensor is exposed to oxygen again
Note: Steps 4 ‐ 7 must be done quickly or the sensor will exit the calibration mode. You can minimize this by remembering the sequence 123223 to perform manual fresh air calibration.
Modbus / RS-485
The sensor support MODBUS protocols over RS‐485, unidirectional transmission
at 9600kbps. Address 0 or FE.
The following Modbus registers are available:
Input Registers
- O2 Value, x10
- Raw ADC Value
Holding Registers
- O2 Span Value (4 byte floating number, part 1)
- O2 Span Value (4 byte floating number, part 2)
- O2 Pot Value
- 4‐20mA output Zero Value
- 4‐20mA output Span Value (4 byte floating number, part 1)
- 4‐20mA output Span Value (4 byte floating number, part 2)
- Control Register
- Status Register
The following commands are available:
0x03 – Read Holding Register
0x04 – Read Input Register
0x06 – Write Holding Register
Device Specifications
Measuring Range:
| 25% O2 | 0‐25% vol. |
|---|---|
| 95% O2 | 0‐95% vol. |
Repeatability:
| 0‐25% CO2 | ± 0.05%, ± 1 % of measured value |
|---|---|
| 0‐95% O2 | ± 0.02%, ± 1 % of measured value |
Accuracy
| 25% / 95% | ±2% full scale |
|---|
Power Supply:
| Maximum Voltage | 24VDC |
|---|---|
| Minimum Voltage | 20VDC |
| Power Consumption | 600mA @ 24VDC |
Sensor Ratings:
| Life Expectancy | >15 years |
|---|---|
| Maintenance Interval | No maintenance required |
| Warm‐up Time | <15 min (instant measurements) |
Outputs:
O2 Output Value| 4‐20 mA, linearly scaled
2‐10VDC Optional
---|---
RS‐485| Modbus Interface
Support
The quickest way to obtain technical support is via email. Please send all
support enquires to support@co2meter.com. In
your email, please include a clear, concise definition of the problem and any
relevant troubleshooting information or steps taken so far, so we can
duplicate the problem and quickly respond to your inquiry.
Warranty
This unit comes with a 90-day limited manufacturer’s warranty, starting from
the date the unit was shipped to the buyer.
During this period of time, CO2Meter.com warrants our
products to be free from defects in materials and workmanship when used for
their intended purpose and agrees to fix or replace (at our discretion) any
part or product that fails under normal use. To take advantage of this
warranty, the product must be returned to CO2Meter.com
at your expense. If, after examination, we determine the product is defective,
we will repair or replace it at no additional cost to you.
This warranty does not cover any products that have been subjected to misuse,
neglect, accident, modifications or repairs by you or by a third party. No
employee or reseller of CO2Meter.com’s
products may alter this warranty verbally or in writing.
Returns
If the product fails under normal use during the warranty period, an RMA
(Return Material Authorization) number must be obtained from CO2Meter.com.
After the item is received, CO2Meter.com will repair or replace the item at
our discretion.
To obtain an RMA number, please call CO2Meter.com at (877) 678‐4259. When
requesting an RMA number, please provide the reason for return and original
order number.
If we determine that the product failed due to improper use (water damage,
dropping, tampering, electrical damage etc.) or abuse, or if it is beyond the
warranty period, we will inform you of the cost to fix or replace your device.
If you are returning your device due to a warranty claim (with an RMA number)
and you still have the unit original package, please use it to ship your unit
to us. Please make sure to include the provided RMA number on the outside of
the box, preferably on the shipping label. Make sure you secure the unit
inside the package properly to prevent any damage during transit that could
void your device’s warranty. Finally, please ship your device to the address
shown under the “Contact Us” section below.
CO2Meter.com will not, under any circumstances, be
responsible for your shipment expenses and no refund will be issued for
shipping charges necessary for you to ship the unit to us.
Liability
All liabilities under this agreement shall be limited to the actual cost of
the product paid to CO2Meter.com. In no event shall
CO2Meter.com be liable for any incidental or
consequential damages, lost profits, loss of time, lost sales or loss or
damage to data, injury to person or personal property or any other indirect
damages as the result of use of our products.
Contact Us
We are here to help!
If the troubleshooting guide above doesn’t help you solving your problem or
for more information, please contact us using the information below.
support@co2meter.com
(877) 678‐4259 Toll free (M‐F 9:00am–6:00pm EST)
(866) 422‐2356
www.co2meter.com
Address:
CO2Meter
131 Business Center
Building A, Unit 3
Ormond Beach, FL 32174
131
BUSINESS CENTER DRIVE
ORMOND BEACH, FL 32174
SUPPORT (386) 256-4910
SALES (877) 678-4259
WWW.CO2METER.COM
SALES@CO2METER.COM
References
- CO2Meter, Inc. (@co2meter) • Instagram photos and videos
- CO2Meter, Inc. | LinkedIn
- YouTube
- CO2Meter.com
- CO2 Meters, CO2 Sensors, CO2 Monitors | CO2Meter.com
- CO2 Meters, CO2 Sensors, CO2 Monitors | CO2Meter.com
- About GasLab® Data Logging Software | CO2Meter.com