HHF-SD1-Meter

Supported Applications

The HHF-SD1 is a combination hot-wire and thermistor anemometer with a built-in real-time SD card data logger, measuring air velocity and air temperature simultaneously from a single telescoping probe. A hot wire senses air speed while a glass-bead thermistor reads air temperature, and an input socket accepts a Type K or J thermocouple for surface or immersion temperature measurement.

Because it logs directly to an SD memory card and produces Excel-compatible (.xls) files, the HHF-SD1 is well suited to environmental testing, balancing fans and motors, HVAC and duct airflow surveys, and clean-room or laboratory air-movement studies. A backlit LCD, automatic temperature compensation, and selectable velocity units make it easy to read in the field, and an optional RS232/USB interface with software allows data to be pulled onto a PC.

The meter comes complete with a hard carrying case, a Type K thermocouple, the telescoping probe, an SD card, and an operator's manual. It is not designed for and should not be used in human applications.

Operating Conditions & Performance

Air velocity is measured over dual sub-ranges of 0.2 to 5 m/s and 5.1 to 20 m/s (equivalent to 40 to 3940 ft/min), with velocity accuracy of ±(5% + a) reading or ±(1% + a) full scale, whichever is greater. Air temperature is measured from 0 to 50°C (32 to 122°F) at 0.1°C (0.1°F) resolution. The telescoping probe is 12 mm (0.47") in diameter and extends from 280 to 940 mm (11 to 37").

Data-logging and interface behavior includes:

• Sampling time (Auto): 1 to 3600 seconds, with the display updating at 1 second
• Memory: SD memory card, storing Excel-compatible logs
• Interface: RS232/USB (with optional cable and software)
• Display: 52 x 38 mm (2.05 x 1.5") LCD with switchable green backlight

The unit runs on 6 'AAA' alkaline or heavy-duty batteries (included) or an optional 9V power adaptor, drawing 15 mA DC without the SD card or backlight and 36 mA with all functions active. It operates from 0 to 50°C (32 to 122°F) at less than 85% RH, weighs 515 g (1.13 lb), and measures 203 L x 76 W x 38 mm D (8 x 3 x 1.50"). The instrument is manufactured to ISO 9001 quality standards.

Configuration Options

Offered as a single model, the HHF-SD1's flexibility comes from its selectable measurement scales and its thermocouple input. Velocity can be displayed in m/s, km/h, ft/min, knots, or mile/hr, and each scale uses a fine/coarse dual-range resolution — for example 0.01 m/s at low speed and 0.1 m/s at higher speed. Temperature reads in °C or °F with automatic temperature compensation.

When a thermocouple is fitted (sold separately), the measuring capability depends on the sensor type. A Type K sensor covers -50 to 1300°C (-58 to 2372°F), while a Type J sensor covers -50 to 1200°C (-58 to 2192°F); both deliver 0.1°C resolution and ±(0.4% + 0.5°C) accuracy over their primary spans, easing to ±(0.4% + 1°C) at the coldest sub-range.

Key Product Differences

The series consists of one meter supported by a full set of replacement and interface accessories:

• HHF-SD1 — Data-logging airflow meter with SD card, hot-wire type
• HHF-SD1-RP — Replacement hot wire probe
• SW-U101-WIN — Software for data logging from meters, with USB and RS232 cables
• HC-SD — Replacement hard carrying case
• SC-SD — Soft carrying case
• ADAPTER-SD — AC adaptor
• USB-SD — Spare USB cable (SW-U101-WIN software required)
• RS232-SD — Spare RS232 cable (SW-U101-WIN software required)
• 2GB-SD — Spare 2 GB SD memory card

Type K and Type J thermocouples are ordered separately to match the temperature task.