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OT138 Portable 4-Gas Detector with Intercom and SOS

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OT138 Portable 4-Gas Detector with Intercom and SOS

OT138 Portable 4-Gas Detector with Intercom and SOS

Configure OT138 for the gases your team needs to monitor, with local alarms, device-to-device voice communication and a direct way to call for help.

  • Match the gas hazards

    Choose a compatible combination of one to four gases across three sensor slots, including a dual-channel option. Confirm target gases and measuring ranges for your site before ordering.

  • Keep workers in contact

    LoRa intercom links compatible detectors for two-way communication. Man-down detection and a one-touch SOS help workers raise an alert when they need assistance.

  • Notice alarms and review events

    Audible, visual and vibration alarms draw attention to changing readings. Stored measurements support later review; wireless data upload depends on the selected configuration.

Natural-diffusion sampling · Up to four gases by configuration · Optional 4G and positioning

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Overview

OT138 is a wearable, natural-diffusion gas detector for monitoring a selected combination of one to four gases. Three sensor slots can accommodate one dual-channel module, subject to sensor compatibility. Its OLED screen shows readings, while audible, visual and vibration alarms, man-down detection and a one-touch SOS support workers in the field. Compatible units can communicate through LoRa intercom. Bluetooth and Wi-Fi are listed for data transfer; 4G upload and BeiDou/GPS positioning are optional. The published specification lists a 2200 mAh battery, at least eight hours of operation and approximately 192 g weight. Confirm the gas combination, range, wireless setup and operating procedure for each application.

Key Features

Gas selection and sampling

  • Natural-diffusion sampling for monitoring air around the wearer.
  • Select one to four compatible gases using three sensor slots, including a dual-channel module; confirm the final gas and range combination.

Team communication and emergency

  • LoRa intercom supports two-way communication between compatible units; confirm the intended setup and coverage.
  • Man-down detection, fault alerts and a one-touch SOS support emergency notification.

Alarms and display

  • Audible, visual and vibration warnings with low, high, TWA and STEL alarm modes.
  • OLED display shows live readings and device status; Chinese and English interface options are listed.

Data and connectivity

  • Stores up to 100,000 records with an adjustable logging interval.
  • Bluetooth and Wi-Fi data transfer; 4G upload and BeiDou/GPS positioning are optional.

Power and charging

  • 2200 mAh rechargeable battery and magnetic charging connection.
  • Published continuous operating time is at least eight hours; actual runtime depends on configuration and use.

Technical Specifications

ModelOT138
Sampling methodNatural diffusion
Sensor configurationThree module slots, including one dual-channel option; 1–4 gases subject to compatible configuration
Gas categoriesCombustible gases, oxygen and selected toxic gases; confirm sensor combination
DisplayOLED
Local alarmsAudible, visual and vibration
Alarm functionsLow / high / TWA / STEL, fault, man-down and SOS
Team communicationLoRa intercom between compatible devices
Data storageUp to 100,000 records; adjustable interval (default 30 s)
Wireless dataBluetooth and Wi-Fi; optional 4G upload
PositioningOptional BeiDou/GPS
BatteryRechargeable 2200 mAh Li-ion
ChargingMagnetic connection; published full charge under 4 h
Continuous operating timeAt least 8 h, depending on configuration and use
Operating temperature−25 °C to +55 °C
Dimensions108 × 63 × 57 mm
WeightApprox. 192 g

Available Gases & Detection Ranges

The gases and ranges below are configuration options for OT138; confirm the final sensor combination and ranges with our team.

Common Gas Parameter listing
Gas detected Measuring Range Optional Range Resolution Rat Response Time
LEL -combustible gas 0-100%LEL 0-100%VOL (Infrared or catalytic ) 1%LEL/1%vol ≤10s
carbon monoxide 0-1000PPm 0-500/2000/5000PPm 0.1/1PPm ≤10s
TVOC 0-100PPM 0-100PPM 0.1PPm/1PPM ≤15s
hydrogen 0-100%LEL 0-1000PPM 1%LEL/1PPM ≤15s
natural gas 0-100%LEL 0-100%LEL 1%LEL ≤10s
Oxygen-O2 0-30%VOL 0-30%、0-100%VOL 0.1%vol ≤10s
ozone 0-10PPm 0-20、100PPm 0.01PPm/0.1PPM ≤15s
hydrogen sulfide-H2S 0-100PPm 0-50、200、1000PPm 1/0.1PPm ≤10s
Methane-CH4 0-100%LEL 0-100%VOL 1%LEL/1%vol ≤10s
fluorine 0-10PM 0-1、10PPM 1/0.1PPm ≤15s
hydrogen chloride 0-20PPm 0-20/50PPm/100PPM 0.01/0.1PPm ≤15s
Nitrogen-N2 0-30%VOL 0-30%VOL、100%VOL 0.1%LEL/1PPM ≤10s
hydrogen 0-100%LEL 0-1000PPm 1%LEL/0.1PPm ≤15s
chlorine 0-20PPm 0-10、100PPm 0.1PPm ≤15s
ammonia gas 0-100PPm 0-50、500、1000PPm 1/0.1PPm ≤15s
oxynitride 0-20PPm 0-50、1000PPm 0.1/1PPm ≤15s
methanal 0-20PPm 0-50、100PPm 1/0.1PPm ≤15s
sulfur dioxide 0-20PPm 0-50、1000PPm 0.1/1PPm ≤15s
nitric oxide 0-250PPm 0-500、1000PPm 1PPm ≤15s
nitrogen oxide 0-20PPm 0-50、1000PPm 0.1/1PPm ≤15s
phosphine 0-20PPm 0-20、100PPm 0.1PPm ≤15s
acrylonitrile 0-100PPM 0-100PPm 0.1/1PPm ≤15s
carbon dioxide 0-5000PPm 0-1%/5%/10%VOL(Infrared ) 1PPM/0.01%VOL ≤15s
hydrogen fluoride 0-10PPm 0-1、10、50、100PPM 0.01/0.1PPm ≤15s
Xylene/methylbenzene 0-20PPm 0-5、10、50、100PPm 0.01/0.1PPm ≤15s
oxirane 0-100PPm 0-100PPm 1/0.1PPm ≤15s
For other gases and measuring ranges, please contact us directly!
Note: Not all gases and range are listed, if you need more information, please contact us.

Request a Quote

<p>Tell us the target gases, measuring ranges, work area and communication needs. We will confirm a compatible OT138 configuration.</p>

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