CWH1350 Intrinsically Safe Infrared Thermometer

Overview

The CWH1350 Intrinsically Safe Infrared Thermometer is a high-temperature, portable non-contact temperature measurement instrument engineered for hazardous environments where electrical spark ignition must be rigorously prevented. Designed in strict compliance with Chinese national explosion-protection standards GB 3836.1–2010 (General Requirements) and GB 3836.4–2010 (Intrinsic Safety “i” Protection), the device features a certified intrinsically safe circuit architecture—ensuring safe operation in Zone 0/1/2 gas atmospheres (e.g., petrochemical refineries, coal mines, solvent-handling facilities, and pharmaceutical cleanrooms with flammable vapor risks). Its optical system employs a thermopile detector with broadband spectral response (6–14 µm), optimized for accurate surface temperature readings across diverse industrial materials—including oxidized metals, ceramics, refractories, and composite surfaces—without physical contact or thermal disturbance. With a wide measurement span of −50°C to 1350°C and a 50:1 distance-to-spot ratio, the CWH1350 enables precise targeting of small or distant components while maintaining repeatability of ±0.5% of reading or ±1°C.

Key Features

• Intrinsically safe design certified to GB 3836.4–2010, suitable for use in explosive gas atmospheres without risk of ignition
• Single-point Class II visible laser aiming (630–670 nm, <1 mW) for intuitive target acquisition
• Adjustable emissivity (0.10–1.00 in 0.01 steps) to compensate for material-specific infrared radiation characteristics
• Real-time dual-mode temperature display with automatic unit switching between °C and °F
• Configurable high/low alarm thresholds (HAL/LAL) with audible and visual alert indicators
• Auto-hold function triggered upon stable signal acquisition (<150 ms response time)
• Data logging capability: stores up to 20 measurement records including MAX, MIN, DIF (difference), and AVG (average) values
• Rugged IP65-rated housing resistant to dust ingress and low-pressure water jets—suitable for demanding field conditions
• Low-power DC operation (8.0–10.0 VDC, ≤80 mA), compatible with standard industrial battery packs or regulated power supplies

Sample Compatibility & Compliance

The CWH1350 is validated for non-contact surface temperature measurement on solid, non-transmissive materials with stable emissivity profiles—including cast iron, stainless steel, aluminum alloys, concrete, brick, refractory linings, and polymer-coated substrates. It is not intended for measuring transparent media (e.g., glass, quartz) or highly reflective bare metals without surface treatment or emissivity correction. The instrument complies with electromagnetic compatibility (EMC) requirements per GB/T 18268.1–2010 (IEC 61326-1) and meets environmental operating specifications per IEC 60068-2 series (thermal shock, vibration, humidity). While not FDA 21 CFR Part 11 or ISO/IEC 17025 accredited out-of-the-box, its measurement traceability supports integration into GLP/GMP quality systems when paired with documented calibration procedures using NIST-traceable blackbody sources.

Software & Data Management

The CWH1350 operates as a standalone field instrument with no embedded Bluetooth, Wi-Fi, or USB connectivity. All stored data (20 records) are retained in volatile memory and accessible via the onboard LCD interface only; no proprietary software, drivers, or cloud synchronization is required or supported. Users may manually transcribe logged values (MAX/MIN/DIF/AVG) for inclusion in laboratory notebooks, QA checklists, or CMMS entries. For audit readiness, facility managers are advised to maintain a calibration log aligned with internal SOPs—recording date, blackbody reference temperature, observed deviation, and technician signature. The device’s intrinsic safety certification documentation—including test reports and Ex certificate number—is supplied with each unit and must be archived per site-specific hazardous area classification protocols.

Applications

• Pre-startup thermal verification of motors, gearboxes, and bearings in oil & gas upstream facilities
• Monitoring furnace linings, kiln shells, and exhaust ducts in cement and metallurgical plants
• Spot-checking steam trap functionality and insulation integrity in chemical process piping
• Verifying hot work permit boundaries prior to welding or grinding in classified zones
• Quality assurance of heat-treated components during batch processing in foundries
• Emergency response temperature screening of electrical enclosures, switchgear, and busbars
• Validation of HVAC duct surface temperatures in pharmaceutical cleanroom support systems

FAQ

Is the CWH1350 certified for use in Zone 0 hazardous areas?
Yes—it carries full intrinsic safety certification per GB 3836.4–2010, permitting deployment in Zone 0 (continuous gas hazard), Zone 1 (likely gas hazard), and Zone 2 (infrequent gas hazard) environments.

Can emissivity be set to values below 0.10 or above 1.00?
No—the adjustable range is strictly limited to 0.10–1.00 in 0.01 increments, covering >99% of industrially relevant materials per ASTM E1933-19 Annex A1 emissivity reference tables.

Does the device support external data export via RS232 or analog output?
No—CWH1350 is a self-contained measurement tool with no communication interfaces; all data interaction occurs via front-panel controls and LCD display.

What is the recommended recalibration interval?
Per ISO/IEC 17025 guidance and typical industrial practice, annual calibration against a NIST-traceable blackbody source is recommended—or more frequently if subjected to mechanical shock, extreme ambient cycling, or critical process control applications.

Is the laser aiming system eye-safe under all operating conditions?
Yes—the integrated Class II diode laser (≤1 mW, 630–670 nm) complies with IEC 60825-1:2014 and poses no retinal hazard during momentary exposure; however, deliberate staring into the beam is discouraged.