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Monitor the right gas at the right point in your refrigeration plant. CETCI cGAS/LPT fixed gas alarm solutions for cold storage and freezer rooms; portable New Cosmos XP-704III and suitable XP-702III-F leak detection devices for service teams. Gas and sensor selection differs for each of NH₃, CO₂, and refrigerants.
In common fluids such as R-22, R-32, R-404A, R-407C, R-410A, R-134a, R-290, R-600a, and HFO-1234yf, a device that assists in locating portable leak points — aspirated refrigerant gas detector.
For ammonia industrial refrigeration, freezer rooms, and chiller facilities, single/dual-channel fixed gas detection. Modbus or BACnet communication and the -LT low temperature option are available in the digital cGAS model.
An economical single-channel fixed transmitter for ammonia (NH₃) and selected other gases in suitable areas of refrigeration facilities. The standard LPT connects to the control system via a 4–20 mA analogue output and a status LED.
| Product | Application | Communication / measurement feature |
|---|---|---|
| New Cosmos XP-702III-F | Service leak detection across flammable gases and compatible refrigerants | Portable, aspirated; gas variant is selected |
| New Cosmos XP-704III | High-precision pinpoint leak detection in HVAC refrigerants | Portable, aspirated, audible/visual alert |
| CETCI cGAS (D / IR sensor options) | Continuous monitoring of NH₃, CO₂, or compatible refrigerants | Modbus/BACnet depending on configuration; with -LT option |
| CETCI LPT-NH3 | Cost-effective NH₃ alarm sensor in temperature-appropriate areas | Single channel, 4–20 mA, −20 … +40 °C (standard) |
CETCI's application brochure outlines a scenario where sensors are located The cGAS-D-NH3 in the internal area, with the FCS control panel positioned outside the room entrance. This allows values to be checked prior to entry; where necessary, control of beacons, horns, ventilation, or equipment can be implemented. An appropriate -LT package is essential at low temperatures.
Not every refrigerant can be monitored with the same detection sensor. For fluids such as R-32, R-454B, R-410A, and R-134a, an IR or suitable portable sensor configuration taking target gas and safety classification into account is selected. Flammability risk and facility standards must be evaluated separately for A2L fluids.
For maintenance personnel carrying out leak point searches across compressors, valves, joints, and evaporator lines, portable instruments such as the XP-704III or suitable XP-702III-F may be used. For 24-hour ambient monitoring and external alarm requirements, cGAS/LPT and a control panel are evaluated.
NOVEL evaluates sensor type, channel count, and panel interface jointly, based on gas schedule, cold room temperature, air currents, door traffic, and the control sequence. Sensor calibration, testing, and maintenance access must also be incorporated into the initial project phase. Site risk assessment and applicable standards govern the final design.
Selection depends on the refrigerant used by the facility. For NH₃ (R717), an ammonia-compatible cGAS or suitable LPT-NH3; for CO₂ (R744), a cGAS with CO₂ sensor; and for HFC/HFO fluids, an appropriate IR refrigerant gas sensor is evaluated. Selection should be based on gas, operating temperature, and alarm sequence.
In the selected configuration, the digital cGAS offers one or two gas channels,an LCD/OLED display, and Modbus/BACnet communication; whereas the standard LPT operates as a single-sensor, LED-indicated, 4–20 mA analogue transmitter. The low temperature option for freezer rooms is specifically evaluated under the cGAS-D-NH3 -LT configuration.
Because ammonia is lighter than air under standard conditions, detection points are generally considered at ceiling or high levels. Racks, fans, air draughts, doors, and potential leak sources modify coverage. The manufacturer brochure recommends ceiling mounting and avoiding fast air streams for the cGAS-D-NH3; the final position must be established by a site risk assessment.
The manufacturer's operating range for the standard LPT is listed as −20 … +40 °C . Therefore, it cannot be considered directly suitable for −40 °C. The cGAS -LT package or an appropriate sampled/protected system must be selected after verifying the temperature limits of the relevant sensor and project requirements.
In an appropriate configuration, data from cGAS/LPT is transmitted to the FCS control panel . The panel relays can be connected to audible-visual alarms, ventilation, and authorised emergency shutdown sequences. Alarm trip points and equipment shutdown logic must be configured in accordance with applicable project standards and authorised engineering approval.
No. The XP-704III is intended for HVAC service engineers to investigate leak points portably. The cGAS, on the other hand, is installed at a fixed point to provide continuous gas monitoring, panel integration, and alarm infrastructure. In large facilities, these solutions can complement each other.
No. The model suitable for joint detection of refrigerants and flammable gases is identified in manufacturer documentation as XP-702III-F / F(S) . Target gases may differ with other variants such as the XP-702III-A/B. The target R code and instrument variant must be confirmed when ordering.
CO₂ (R744) and certain refrigerants can accumulate in enclosed, poorly ventilated spaces and displace oxygen. A CO₂ gas detector and O₂ deficiency monitoring are not identical measurements; separate sensors may be required based on risk assessment. CETCI product selection must be made according to target gases and concentration ranges.
Refrigerant leaks in refrigeration and air conditioning systems can reduce operating efficiency, create environmental impacts, and, with certain gases, pose safety hazards in enclosed spaces. Fixed or portable leak detectors assist in the early identification of escapes and localization of the source.
Detection technologies may differ for R134a, R32, R410A, CO₂, or other refrigerants. The target gas, expected leak concentration, ambient ventilation, and the requirement for fixed monitoring versus service-level leak tracing are decisive factors in instrument selection.
CETCI Türkiye: Critical Environment Technologies – NOVEL product and technical support. NOVEL provides technical support for product selection, mounting layout, commissioning, and servicing suited to the target gas, cold room temperature, and facility risk scenario.
Important: The gas schedule, temperature range, certification, and alarm connections of the instruments vary depending on the model/sensor configuration . Cold room gas detection schemes must be prepared in accordance with site-specific risk assessments and applicable regulations.
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