The ChemLogic® CL2 Dual-Point Detector provides continuous monitoring and quick response to low level toxic and corrosive gases. ChemLogic Detectors are low-maintenance offering reliable, interference-free colorimetric gas detection. The system utilizes ¼” tubing that allows samples to be drawn up to 150-feet for most gases.
ChemLogic Detectors are easy to install. Simply plug them into the wall and they're ready to go! They come equipped with relay & analog outputs, and can also be integrated digitally.
For more information on isocyanates and OSHA standards, please click here.
** IMPORTANT NOTICE ** As of February 2025, the legacy pumps (#870328) - used since the inception of this product - have been discontinued. Replacement pumps are now available which require a one-time system conversion. Conversion upgrades can be performed by DOD by requesting a return authorization or by ordering a field conversion kit. Please call or request Technical Product Support for further assistance.
Lead times vary by item. A shipment/delivery estimate will be provided upon placement of your order. Please contact us to review your delivery requirements before requesting expedited shipping for rush delivery.
Lead times vary by item. A shipment/delivery estimate will be provided upon placement of your order. Please contact us to review your delivery requirements before requesting expedited shipping for rush delivery.
The ChemLogic® CL1 (1-point) and CL2 (2-point) are continuous gas detection systems designed to monitor toxic, corrosive, and asphyxiant gases for process monitoring and personnel safety. They continuously sample air from remote locations and provide real-time concentration readings, alarms, and output signals to external systems.
How does the CL1 detect gas?
The CL1 draws a gas sample across a ChemLogic® paper tape. When the target gas is present, the tape changes color. An optical system measures this color change and converts it into a gas concentration reading.
What happens when a gas alarm is triggered?
The CL1 displays the gas concentration, activates visual alarms, triggers relays or analog outputs, and records the alarm data to removable storage.
What is the difference between CL1 and CL2?
The CL1 is a single-point continuous gas detector, while the CL2 is a dual-point detector capable of monitoring two sampling locations simultaneously using the same ChemLogic® colorimetric technology
What detection technology does the CL1/CL2 use?
The CL1/CL2 uses colorimetric tape (ChemLogic® Cassette) technology combined with an optical detection system. When target gas contacts the tape, the tape changes color. The optics measure this change and convert it into a precise gas concentration reading which provides interference-free, low-maintenance, and highly reliable detection of low-level toxic and corrosive gases.
Is the CL1/CL2 a continuous monitor or a point-in-time monitor?
It is a continuous monitoring system. When operating in normal analysis mode, the unit continuously samples air, updates concentration readings, and activates alarms when thresholds are exceeded.
Gases & Applications - CL1/CL2 Systems
What gases can the CL1/CL2 detect?
The CL1/CL2 supports a wide range of gases, Click here for gas list.
Can the CL2 (2-point) detect two different Gas Family types?
No. The CL1/ CL2 can only have one tape type installed. In result can detect only one gas type.
Are the CL1 and CL2 suitable for hazardous locations?
With the optional Z-Purge enclosure, the CL1 and CL2 can be installed in Class I, Division 1 hazardous locations
Sampling & Tubing - CL1/CL2 Systems
What type of sample tubing is required?
FEP tubing, 1/4" OD x 1/8" ID only. Using any other tubing may cause measurement errors or system damage
What is the maximum sample line length?
Up to 150 feet (45 meters). Shorter sample lines improve response time. Monitoring Diisocyanates gasses the maximum is 6 inches.
What happens if filters are not maintained?
Dirty filters or tubing can: dod Slow gas response Reduce accuracy Cause sample loss Lead to internal system damage
How far can gas samples be drawn to the detector?
Up to 150 ft (45 m) using ¼” OD Teflon FEP tubing for most gases. Maximum 6 inches of sample tubing for diisocyanate applications due to their reactive nature
Installation & Power - CL1/CL2 Systems
What power does the CL1/CL2 require?
Input voltage: 100 – 260VAC (50/60Hz). Power consumption: Less than 1 Amp The CL1 comes standard with built in AC Power Cord. Optional configuration for hardwire connection is available.
Can the unit be wall mounted?
Yes. The CL1/CL2 is designed for secure wall mounting using the mounting pattern shown in the manual.
What environmental conditions can the detector operate in?
Operating temperature: 40°F to 104°F (4°C to 40°C) Enclosure rating: NEMA 4X for industrial and outdoor environments
Alarms & Outputs - CL1/CL2 Systems
What alarm levels are available?
The CL1/CL2 provides: Alarm Level 1 and Alarm Level 2. These are factory-set (typically at 1× and 2× TLV) but are user adjustable.
What happens when an alarm occurs?
When an alarm level is exceeded: The display flashes alarm indicators Alarm relays activate 4-20 mA output reflects the gas concentration Alarm events are logged to internal memory and SD card
What do the alarm colors mean?
Red: Gas Alarm Orange: Service Fault Yellow: Minor Fault Blue: Information Message Green: Status Update
Are alarm relays latching or non-latching?
This is configurable in the setup menu. Latching: alarm stays active until acknowledged Non-latching: alarm clears automatically when gas drops below threshold
Are fault relays normally energized or de-energized?
The system fault relay is energized during normal operation and de-energized when a fault occurs.
What outputs are available?
The standard outputs include: Alarm Level 1 relay, Alarm Level 2 relay, System fault relay, 4-20 mA analog output, Remote alarm/fault reset input Optional outputs include: Modbus/TCP, Modbus/ RS485, Ethernet/ IP
Display & Operation - CL1/CL2 Systems
Is the main menu password protected?
No. The main menu is always accessible for normal operation.
Which menus are password protected?
Setup Menu: optional password Service Menu: password protected by default Passwords can be changed or disabled by authorized users.
What is Cassette Saver Mode (TSM)?
Cassette Saver Mode reduces cassette advancement during gas events to extend cassette life. Modes include: Fixed Cycle, Single Reading, Continuous ⚠️ Important: When Cassette Saver Mode is active, true continuous analysis may be paused, and displayed concentrations may not update in real time.
How do I know Cassette Saver Mode is active?
“TSM” appears on the analysis screen A blinking countdown indicates no active analysis during that period
Data Logging & SD Card - CL1/CL2 Systems
What data does the CL1/CL2 store?
Gas concentration logs, Alarm and fault history, Event logs, Configuration data, TWA data (where applicable)
Is an SD card required?
An SD card is not required for operation but is required for data logging and historical record retention.
What SD cards are supported?
Micro SD / TransFlash Up to 2 GB Must be formatted FAT16 FAT32 cards will not work
Can the SD card be installed while powered on?
Yes. The SD card slot supports hot insertion and removal.
Is data logging available?
Yes. The CL1/CL2 include an SD memory card for easy retrieval of historical gas detection data and event logs
Maintenace & Service - CL1/CL2 Systems
What is the DAC value?
DAC represents the LED light intensity used by the optics system. It indicates the cleanliness and transparency of the optic path.
What is a normal DAC range?
A clean, properly operating CL1 typically has a DAC value between 70 and 120.
What does “Warning: Optics Dirty” mean?
This warning appears when the DAC reaches 140, indicating the optics should be cleaned soon. It does not trigger the fault relay.
What does “DAC Calibration Required” mean?
This fault occurs at a DAC value of 150. The CL1 will stop analysis until the optics are cleaned and recalibrated.
How often should the optics be cleaned?
Cleaning is recommended when the DAC value approaches 130 or when optics-related faults occur.
What causes an “Optic Comm Failure”?
This is typically caused by loss of 5 VDC power to the optics, a faulty communication cable, or a failed HMI communication port.
What components make up the flow system?
The flow system includes two sample pumps, an upper filter/orifice assembly, a pressure differential transducer, and the HMI.
What are normal pump (P) and flow (F) values?
Pump voltage (P): typically between 1600 and 3200
What causes Flow Failure Low faults (Optics Orifice Dirty)?
These faults usually indicate a clogged optic orifice or a pressure transducer offset issue.
What causes Flow Failure High faults?
Common causes include leaks in the flow path, clogged filters, or worn/weak sample pumps.
How long do sample pumps typically last?
Sample pumps generally last 3–5 years under normal operating conditions.
What happens if one pump fails?
The CL1 automatically disables the failed pump and continues operation using the remaining pump. No fault is generated, but a P1 or P2 indicator appears on the display.
Are ChemLogic® cassettes gas-specific?
Yes. Each cassette is specific to a particular gas and must match the gas selected in the CL1 setup.
Can expired ChemLogic® tape be used?
No. The cassette must be within its expiration date to ensure accurate detection.
How much tape advances during each analysis cycle?
Approximately 0.30 inches (7.6 mm) per advance.
What causes a “Gate Open” or “Gate Close” fault?
These faults occur when the tape advance mechanism does not properly change the microswitch state during the gate open or close sequence.
