HHT12 Handheld Noncontact Optical Tachometer

Supported Applications

The Omega HHT12 is a hand-held precision optical tachometer designed for non-contact measurements of rotational speed. The instrument measures speeds from 5 to 99,999 RPM at a distance of up to 36 inches (91.44 cm) from a reflective target and at an angle of up to 30° off perpendicular.

Key functional capabilities include:

• Recall of maximum and minimum values
• Tripod mounting for continuous measurements with lock-on capability

Operating Conditions & Performance

The HHT12 operates within an ambient temperature range of 40 °F to 105 °F (5 °C to 40 °C). Humidity limits are defined as a maximum relative humidity of 80% for temperatures up to 88 °F (31 °C), decreasing linearly to 50% relative humidity at 100 °F (40 °C); conditions must be non-condensing.

Performance specifications include:

• Speed Range: 5 to 99,999 RPM
• Accuracy: ±0.01% of reading or ±1 digit
• Resolution: 0.001 RPM to 1 RPM
• Operating Range (Distance/Angle): 36" (91.44 cm) up to 30 degrees off perpendicular
• Light Source: Red LED

The unit meets Installation Category II and Pollution Degree Level II per IEC 664.

Configuration Options

The HHT12-Series is offered as a single handheld configuration with the following documented attributes:

• Display: 5 Digits, 5 Alpha-numeric LCD
• Batteries: 2 "AA" 1.5 V (DC) alkaline included; batteries are NOT rechargeable
• Battery Life: 60 hours continuous typical with provided batteries
• Dimensions: 6.92" (17.58 cm) H x 2.4" (6.10 cm) W x 1.6" (4.06 cm) D
• Weight: approx. 7 oz. (210 g)

The device is not user serviceable.

Key Product Differences

The bundle documents a single model, HHT12, within the series. No alternative housings, sensor types, or output configurations are listed for this specific product line in the provided source material.