pCO2_LDEO

Data | Plots

Summary

Type	pCO2
Vendor	Lamont-Doherty Earth Observatory
Model	Lamont-Doherty Earth Observatory pCO2 underway system
S/N	LI-6251 IRG1-338
CORIOLIX ID	pcotwo000338
Inventory ID
Data ID
Class	Flowthrough
Location	Wet Lab
Native Sample Rate	0.0055 Hz
UDP Port(s)	54109 None
Enabled	True

General Description

LDEO pCO2 Seawater Sensor; a system for the underway continuous measurement of surface water pCO2. The pCO2 system consists of several major components; a seawater/air equilibrator, the analysis enclosure (LI-COR 6251 infrared gas analyzer (IR), gas dryer, pressure sensor, A/D modules and gas stream selection valve), computer for system control and data logging, an enclosure holding a pair of air pumps for delivering the sample gas streams, 5 cylinders of CO2 in air calibration mixtures, 1 cylinder of nitrogen gas.

Data Collection Specs

Native Data Feed At The Sensor

Signal Type

Communication Type

Serial Details

Baud Rate
Parity
Stop Bits
Byte Size
Timeout (s)	None
Polled Start Commands
Polled Serial Commands

Ethernet Details

MAC Address
IP Address
Protocol

Source File Details

Path
Filename

Native Data Format

Native Data Description

The original sensor format has been modified by pre-pending the logger name and logger timestamp and appending the additional ship supplied parameters lat, lon, cog, sog, sst, salinity, baro, wind speed, and wind dir. Example data line: pco2_ldeo_merge 2021-11-08T01:55:23.9660Z 2021312.08020, 1791.82, 27.38, 1017.46, 58.05, 259.30, 258.73, 0.38, 1.12, 12.00, CC46471, 6426.167370 N,16531.564263 W,269.89,11.2,0.5166, 25.3485,1015.9 ,18.8,69.1,6.35 Field Descriptions: Log_Name Log_Time Date-Time, CO2(mvolts),Cell Temp(C),Baro Pr,Flow(ccm),CO2(ppm),pCO2(uatm),Equil T(C),SBE38 T(C),ID#, ID,lat,lon,cog(D),sog(knots),sst(C),salinity(psu),baro(hPa),wind speed(knots),wind dir(D)

Native Data Type

text

Start of Message Characters

End of Message Characters

Number of Fields to Trim

Sample Data Message

2024049.78737, 4060.07, 48.78, 1011.56, 64.67, 613.10, 606.01, 100000.29, 7.47, 0.00, Equil, 5621.675935 N,13319.698271 W,96.08,10.1,6.8959, 31.3182,.990276,6.6,81.0,5.21 2025296.92059, 3486.51, 43.15, 991.25, 53.96, 457.85, 444.33, 100000.29, 4.08, 0.00, Equil, 6329.118301 N,16738.990351 W,354.48,6.5,, 30.9661,.989813,32.7,355.1,5.30

Message Parser Format

['^(?P<sensor_datetime>\d*\.\d+),\s*(?P<co2_mv>\d*\.\d+),\s*(?P<celltemperature_degreesc>\-?\d*\.\d+),\s*(?P<equilibratorpressure_mbar>\d*\.\d+),\s*(?P<gasflowrate_cm3perminute>\d*\.\d+),\s*(?P<xco2_ppm>\d*\.\d+),\s*(?P<sourcepco2_uatm>\d*\.\d+),\s*(?P<equilibratortemperature_degreesc>\-?\d*\.\d+),\s*(?P<sampletemperature_degreesc>\-?\d*\.\d+),\s*(?P<sourceid_unitless>\d*\.\d+),\s*(?P<id>.*),\s*(?P<latitude>\d*\.\d+)\s(?P<lat_dir>[NS]),\s*(?P<longitude>\d*\.\d+)\s(?P<lon_dir>[EW]),\s*(?P<cog>\d*\.\d+),\s*(?P<sog>\d*\.\d+),\s*(?P<sst>\-?\d*\.\d+)?,\s*(?P<salinity>\d*\.\d+),\s*(?P<baro>\d*\.\d+),\s*(?P<wind_speed>\d*\.\d+),\s*(?P<wind_dir>\d*\.\d+),\s*(?P<unknown>[\-\d\.na]*)$']

Data/Message ID

Data Processing

Data Processing Script

NoTransformation

Data Rates

Native Sample Rate

0.0055 Hz

Shipboard Network Packet Rate

0.0055 Hz

Ship to Shore Rate

0.0055 Hz

Data Storage & Access

Raw Data Ethernet Distribution

IP Address	10.3.0.255
Port	54109
Packet Size	None

Transformed Data Ethernet Distribution

IP Address
Port	None

OpenRVDAS Logger Mode

file/db

EEZ Logger Mode

off

InfluxDB Port

None

Archive to Database

True

Transmit Real-time Data to Shore

True

Time Source

Source

Parameters

Long Name	Short Name	Units	Diagnostic
Cell Temperature	cell_temperature	degrees_C	True
Carbon Dioxide Concentration	co2	mV	True
Equilibrator Pressure	equilibrator_pressure	mbar	True
Gas Flow Rate	gas_flow_rate	cm3/minute	True
Temperature - Sample	sample_temperature	degrees_C	True
Source ID Number	source_id	unitless	True
Partial Pressure of Carbon Dioxide relative to the Source	source_pco2	uatm	False
xCO2	xco2	ppm	False

Physical Sensor Specs

Operating Limits
Input Power	None - None V AC
Ideal Power	None V AC
Operating Current	None - None mA @ None V AC
Analog Output	None - None
Operating Flow Rate	None - None ml s-1
Ideal Flow Rate	None ml s-1
Operating Depth	None - None m
Operating Temperature	None - None degree_C
Lamp Life	None days
Response Time	None seconds
Additional Time Offset	None seconds
Physical Status
Current Location	installed
Current Status	in use
Physical Condition
Physical Configuration
Software Version
Software Configuration
Data Acquisition Device ID
Communication Type at the Data Acquisition Device
Data Acquisition Device Serial Port
Data Acquisition Device Analog/Digital Port(s)
Data Acquisition Device Modbus Unit/Device IDs
Data Acquisition Device Modbus Function Codes
Data Acquisition Device Modbus Registers
Data Acquisition Device Modbus Retransmit UDP Ports
Sensor Use Level	primary
Enabled	True
Vessel Installation Location
Vessel	sikuliaq
Vessel Location	Wet Lab
Location Coordinates (meters)	14.9189, 9.5451, -4.3977
Sensor Orientation
Height Above Waterline (meters)	4.2453
Zero Line Reference (degrees from bow)	None
Receives Filtered Water	False

Maintenance & Support

Sensor Log

Date (UTC)	Submitter	Event Type	Details
Oct 27 2025 19:08:51	Hilburn, Mackenzie	sensor specs update	height_above_waterline changed from [-4.2453] to [4.2453]
Oct 26 2025 16:15:56	Hilburn, Mackenzie	sensor specs update	height_above_waterline changed from [None] to [-4.2453]
Oct 26 2025 16:15:56	Hilburn, Mackenzie	sensor specs update	location_coords changed from [] to [14.9189, 9.5451, -4.3977]
Feb 20 2025 20:15:28	Nahorniak, Jasmine	parameter change	Parameter Equilibration Temperature (Do Not Use) deleted.
Feb 20 2025 17:24:55	Nahorniak, Jasmine	new parameter	Copied xco2_corr (ppm) parameter metadata from pcotwo000338.
Jul 27 2024 14:38:33	Greto, Carmen	sensor specs update	sensor_name changed from [pCO2_LDEO Seawater Sensor] to [pCO2_LDEO]
Jul 27 2024 14:38:15	Greto, Carmen	sensor specs update	sensor_name changed from [LDEO pCO2 Seawater Sensor] to [pCO2_LDEO Seawater Sensor]
Feb 17 2024 22:13:03	Nahorniak, Jasmine	renamed sensor	Changed sensor ID from pcotwo046471 to pcotwo000338.
Feb 17 2024 22:03:58	Nahorniak, Jasmine	sensor specs update	native_type changed from [] to [text]
Feb 17 2024 22:03:58	Nahorniak, Jasmine	sensor specs update	description changed from [LDEO pCO2 Seawater Sensor] to [LDEO pCO2 Seawater S ... der of nitrogen gas.]
Feb 17 2024 22:03:58	Nahorniak, Jasmine	sensor specs update	serial_number changed from [CC46471] to [LI-6251 IRG1-338]
Feb 17 2024 21:34:26	Nahorniak, Jasmine	new parameter	Copied CO2 (ppm) parameter metadata from pcotwo046471.
Feb 17 2024 21:21:40	Nahorniak, Jasmine	new parameter	Copied CO2 (ppm) parameter metadata from pcotwo046471.
Feb 17 2024 20:46:52	Nahorniak, Jasmine	sensor specs update	transmit_rate_hz changed from [None] to [0.0055]
Feb 17 2024 20:46:52	Nahorniak, Jasmine	sensor specs update	packet_rate_hz changed from [None] to [0.0055]
Feb 17 2024 20:46:52	Nahorniak, Jasmine	sensor specs update	transmit_port changed from [None] to [54109]
Feb 17 2024 20:46:52	Nahorniak, Jasmine	sensor specs update	transmit_ip changed from [] to [10.3.0.255]
Feb 17 2024 20:46:52	Nahorniak, Jasmine	sensor specs update	use_level changed from [] to [primary]
Feb 17 2024 20:46:52	Nahorniak, Jasmine	sensor specs update	location_text changed from [] to [Wet Lab]
Feb 17 2024 20:46:52	Nahorniak, Jasmine	sensor specs update	vessel changed from [] to [Sikuliaq]
Feb 17 2024 20:46:52	Nahorniak, Jasmine	sensor specs update	enabled changed from [False] to [True]
Feb 17 2024 20:46:52	Nahorniak, Jasmine	sensor specs update	current_status changed from [] to [in use]
Feb 17 2024 20:46:52	Nahorniak, Jasmine	sensor specs update	current_location changed from [] to [installed]
Feb 17 2024 20:46:52	Nahorniak, Jasmine	sensor specs update	responsible_party changed from [] to [UAF Marine Technicians]
Feb 17 2024 20:46:52	Nahorniak, Jasmine	sensor specs update	owner changed from [] to [UAF]
Feb 17 2024 20:46:52	Nahorniak, Jasmine	sensor specs update	processing_script changed from [] to [NoTransformation]
Feb 17 2024 20:46:52	Nahorniak, Jasmine	sensor specs update	sample_rate_hz changed from [None] to [0.0055]
Feb 17 2024 20:32:50	Nahorniak, Jasmine	sensor specs update	text_regex_format changed from [] to [['^(?P<sensor_dateti ... ind_dir>\d+\.\d+)$']]
Feb 17 2024 20:32:50	Nahorniak, Jasmine	sensor specs update	vendor changed from [Not Applicable] to [Lamont-Doherty Earth Observatory]
Feb 17 2024 18:58:12	Nahorniak, Jasmine	new sensor	Initial submission of sensor metadata.

Calibration & Maintenance

Frequency	Last Completed	Next Due
Maintenance A:

Maintenance B:

Maintenance C:

Calibration

Recommended Replacement

Warranty

Calibration Files

Date	Version	Author	Type	Document	Access

User Guides & Documents

Date	Version	Author	Type	Document	Access
Oct 26 2025		Mackenzie Hilburn	sensor_image	pCO2_LDEO

Ownership

Quantity	Value
Owner	UAF
Responsible Party	UAF Marine Technicians
Inventory ID
Purchase Date
Acquire Date
Acquire Condition
End/Lost Ownership Date

Vendor Support

Support Type	Details
Company	Lamont-Doherty Earth Observatory
Website	https://lamont.columbia.edu
Phone	--
Email	--
Shipping

Copyright Notice: All sensor-specific images and documentation on this page are copyright of the vendor.