AS ONE TM-300 Digital Thermometer (Sensor Not Included)
| Brand | AS ONE |
|---|---|
| Origin | Taiwan |
| Manufacturer Type | Manufacturer |
| Country of Origin | China (Domestic) |
| Model No. | 1-5812-01 |
| Temperature Range | -50 to +1300 °C |
| Resolution | 0.1 °C / 1 °C (switchable) |
| Display | 3.5-digit LCD with backlight |
| Accuracy | ±0.3% rdg + 1 °C (-50 to +1000 °C) |
| Sampling Rate | 2.5 readings/sec |
| Power Supply | 1 × 006P (9 V) battery (included) |
| Dimensions | 155 × 65.5 × 35 mm |
| Weight | 177 g |
| Thermocouple Type | K-type |
| Functions | Data Hold, Max Value Storage & Recall, Auto-Hold Trigger |
Overview
The AS ONE TM-300 Digital Thermometer is a handheld, single-channel temperature measurement instrument engineered for precision and operational reliability in industrial maintenance, laboratory quality control, and HVAC commissioning environments. Unlike integrated probe-based systems, the TM-300 is designed as a dedicated display and data processing unit—requiring external K-type thermocouple sensors (not included)—to deliver high-fidelity thermal readings across an extended operational range of -50 °C to +1300 °C. Its core measurement architecture adheres to standardized thermoelectric voltage-to-temperature conversion per IEC 60584-1, ensuring traceable alignment with international thermocouple reference tables. The device implements a 2.5 Hz sampling rate to support dynamic thermal profiling, while its dual-resolution mode (0.1 °C / 1 °C, user-switchable) enables optimized readability across both fine-tolerance calibration tasks and broad-range process monitoring.
Key Features
- Single-channel K-type thermocouple interface compliant with ANSI MC96.1 and IEC 60584 standards
- Data Hold function: freezes the current reading on display for documentation or remote observation
- Max Value Storage & Recall: automatically records and retains peak temperature during measurement sessions; recalled via dedicated button press post-test
- Backlit 3.5-digit LCD display with adjustable contrast—optimized for low-illumination environments including furnace interiors, ductwork access points, and darkened cleanroom utility zones
- Auto-Hold trigger logic responsive to thermal stability thresholds, reducing manual intervention during stabilization-critical procedures
- Compact ergonomic housing (155 × 65.5 × 35 mm) with non-slip textured casing and balanced weight distribution (177 g) for prolonged one-handed operation
- Integrated power management with low-battery indicator and auto-shutdown after 15 minutes of inactivity
Sample Compatibility & Compliance
The TM-300 accepts standard miniature, grounded, or ungrounded K-type thermocouples with mini-connectors (e.g., standard 2-mm or 3.5-mm DIN 43710 compatible plugs). It does not support RTD, thermistor, or J/T/E/N-type inputs without external signal conditioning. Device firmware and hardware design comply with electromagnetic compatibility requirements per EN 61326-1:2013 (industrial environment), and safety conforms to IEC 61010-1:2010 (Measurement Category II, Pollution Degree 2). While not certified for intrinsically safe applications, its 9 V battery-powered architecture inherently limits energy availability—making it suitable for non-hazardous area use per ATEX/IECEx zone classification guidelines. Calibration verification may be performed using NIST-traceable dry-block calibrators or precision temperature baths meeting ASTM E74 or ISO/IEC 17025 requirements.
Software & Data Management
The TM-300 operates as a standalone instrument with no onboard data logging memory or PC connectivity. All stored max-value data resides exclusively in volatile RAM and is cleared upon power cycle—intentionally designed to meet GLP/GMP audit requirements where temporary, non-persistent storage avoids validation complexity. For regulated environments requiring electronic record retention, users integrate the TM-300 into validated workflows by pairing it with external chart recorders, PLC analog input modules, or USB thermocouple interfaces (e.g., NI USB-TC01) feeding into validated LIMS or SCADA platforms. The absence of firmware-updatable memory ensures configuration stability—a key consideration under FDA 21 CFR Part 11 for instruments used in pharmaceutical manufacturing or medical device sterilization validation.
Applications
- Verification of thermal profiles in industrial ovens, kilns, and annealing furnaces (up to 1300 °C)
- Monitoring exothermic reactions in chemical synthesis reactors and catalyst testing rigs
- Calibration cross-checks of fixed-mount temperature transmitters in petrochemical refineries
- Validation of autoclave and depyrogenation tunnel cycles per ISO 17665 and USP
- Field diagnostics of HVAC heat exchangers, boiler flue gas stacks, and steam trap performance
- Educational thermodynamics labs requiring stable, repeatable high-temperature reference measurements
FAQ
Does the TM-300 include a thermocouple sensor?
No. The TM-300 is a display and processing unit only. A compatible K-type thermocouple must be purchased separately.
Can the TM-300 measure humidity?
No. It is a dedicated temperature meter. Humidity measurement requires a separate hygrometer or a combined TH sensor system.
Is the device suitable for food safety temperature audits?
Yes—when used with appropriate food-grade K-probes (e.g., stainless steel sheathed, 3A-compliant tips) and validated per FDA Food Code Annex 1 and HACCP critical limit protocols.
What is the recommended recalibration interval?
AS ONE recommends annual functional verification against a certified reference source; interval may be adjusted per internal quality procedures aligned with ISO/IEC 17025 Clause 6.6.
Can the backlight be disabled to conserve battery life?
No—the backlight activates automatically during button press or low-light detection and cannot be manually deactivated; typical battery life exceeds 200 hours of intermittent use.
