• Audible and visual notification for leak detection
• LED screen for easy to read display
• Works on all halogenated refrigerants
• Flexible probe allows access to the hard-to-reach areas
• 6 levels of sensitivity adjustment

The hilmor Heated Diode Leak Detector offers the greatest sensitivity and fastest response of any portable refrigerant detector available. This is achieved through the use of a highly sensitive semi-conductive sensor combined with a sophisticated microprocessor-controlled circuit. In addition to the superior performance and functional advantages, it offers a uniquely designed ergonomic shape to provide greater ease of use and comfort.

1. ON/OFF Button

2. SENS Button

3. RESET Button

4. MUTE Button

5. Panel Display

6. Sensor (Inside Probe Tip)

7. Flexible Probe

8. Audio Mute Indicator

9. Battery Voltage Indicator

10. Real-Time Detection Indicator

11. Gas Flow Indicator

12. Sensor Error Indicator

13. Sensor Indicator

14. Display During Warm-Up

Sensitivity adjustment

The LDHD250 has six (6) levels of sensitivity adjustment. When the SENS button is pressed, the sensitivity is displayed in the Real-Time Detector Indicator area on the panel display as a number (1-6) for 3 seconds and then goes back to a flashing real-time indication. 1 is the lowest sensitivity and 6 is the highest.

Audible / visual alarms

The unit features two notification indications – an internal speaker audible alarm and LED screen data visual alarm. When a leak is detected the LED screen displays the leakage level. When the device is powered ON, the audible indication is deactivated by default. The audible alarm may be enabled by pressing the MUTE button, allowing audible as well as visual indication. Press the MUTE button again to disable the audible alarm.

Sensor status indicator

The device automatically diagnoses and indicates the sensor’s status. When on, the circuit automatically senses the condition of the sensor and can indicate a failed or missing sensor.

If the circuit detects a failed or missing sensor, the display will show an icon and the leak detector will stop working.

Automatic circuit/reset

Upon initial power-on and completion of the warm-up, the unit automatically sets itself (automatic circuit) to ignore the level of refrigerant present at the tip. Only a reading greater than this level will cause a notification.

NOTE: Since this feature causes the unit to ignore any refrigerant present at the sensor tip after the warm-up is complete, the unit should be powered on and allowed to warm up in fresh air, to achieve maximum sensitivity.

Reset feature: Resetting the unit during operation performs a similar function; it programs the circuit to ignore the level of refrigerant present at the tip. Each time the RESET button is pressed, as you move closer to the leak, the unit sets its threshold for detection to a level above the current concentration being detected.

By moving closer to a large leak and pressing RESET each time a full detection is indicated, the user can pinpoint the source of the leakage. Similarly, the unit can be moved to fresh air and reset for maximum sensitivity. Resetting the unit with no refrigerant present (fresh air) causes any level above zero to be detected. Each time the RESET button is pressed, the LED displays “8” for about five (5) seconds to provide a visual confirmation of the reset action.