DLD-600 Forest Fire Prevention Locator Instruction Manual

Harbin Optical Instruments Factory Co., Ltd.

I. Purpose of the Instrument

DLD-600 The forest fire lookout directional instrument is primarily used in forest fire watchtowers to measure azimuth, distance, elevation difference, horizontal angle, and slope angle; it is also employed in general surveying applications such as agricultural water conservancy, land planning, and topographic mapping; furthermore, it can be utilized at tourist attractions, Wilderness first aid, monitoring It can also be used to issue early warnings for emergencies in densely populated areas, as well as in military applications, such as enemy reconnaissance at border outposts.

II. Instrument Technical Parameters

Model: DLD-600

Dial diameter: 600 mm

Dial reading range and graduation value: 360 °, 0.5 degree

Pan-tilt angle range: ±45 degree

Compass: Features a permanent-magnet needle and a liquid-damping mechanism, ensuring reliable accuracy and smooth rotation.

Telescope: monocular, continuously variable magnification telescope 20 ~60×60mm

III. Instrument Structure

The instrument consists of four main components: the telescope, the mount, the graduated circle assembly, and the tripod.

Telescope 1 Installed on the pan-tilt head 3 Above; the pan-tilt unit is mounted on the support pole assembly. 6 On top, the pan-tilt head features a horizontal locking knob. 2 , Vertical Circle 4 , Pitch and Yaw Tightening Handle 5 etc.; the bottom of the support rod assembly is equipped with a pointer. 8 With the dial 7 It is connected and capable of rotation, such that, through the linkage with the telescope via the support rod assembly, the azimuth angle through which the telescope has rotated can be indicated by the graduated dial; vertical circle 4 Indicates the telescope’s elevation angle. The scale dial is equipped with a compass. 9 Use Regarding the orientation of the calibration dial, spirit level 11 Used to level the dial for calibration. The bottom of the dial is equipped with a standard threaded hole for mounting on a tripod. 10 Connection fixation (see illustration).

IV. Instrument Operation Procedures

1 , Installation Method for the Instrument

① Place the stent group 6 Insert from the center hole of the black backplate until it is fully seated, with the compass and spirit level facing the center post of the bracket assembly.

② Place the map flat on the black backing board, aligned with the central rod of the bracket assembly, and mark the positions for the compass and level holes.

③ Place the dial 7 Insert the eight pins one by one into the central rod of the bracket assembly, adjust the height and clearance to the specified values, and then secure them using the dedicated hex key.

④ Install the pan-tilt head 3 Screw the central rod thread of the bracket assembly in until it is securely tightened.

⑤ Set up the tripod 10 , screw the threaded base of the assembled instrument onto the tripod’s mounting bolt until it is securely fastened;

⑥ Place Telescope 1 Secure the camera to pan-tilt head 3, and adjust the tripod height according to the observer’s stature.

2 , Instrument Adjustment Methods

① Adjust the length of each telescoping leg of the tripod to center the bubble in the level vial, then lock the tripod legs.

② Loosen the horizontal locking knob 2 , rotate the telescope 1 Point the telescope in the same direction as the pointer, then tighten the horizontal locking knob. 2, Instrument installation and adjustment have been completed.

 3 , Azimuth and Elevation Angle Measurement

Rotate the telescope using the support rod beneath it. 6 The pointer rotates in sync, while the telescope simultaneously performs vertical elevation and depression movements. When the telescope is aligned directly with the observation target, the scale reading indicated by the pointer represents the azimuth of the target, and the scale reading indicated by the vertical-circle pointer represents the target’s elevation angle.

4 , Distance Measurement

The distance measurement is explained as follows:

For example: in A , Points B and C simultaneously observe the fire at point C; it is known that the distance between points A and B is 1,000 meters.

Require to measure C The distances and bearings to points A and B.

In A By observing point C from point A and point B, the measure of ∠A can be determined; similarly, by observing point C from point B and point A, the measure of ∠B can be determined.

Assume the measured value of ∠A is 30. °, ∠B = 60°

Therefore: ∠C = 90 °, and it is also known that AB = 1000 meters;

According to the Law of Sines: it follows that

5 , Height Measurement

Depending on the working conditions and practical requirements, the instrument can be placed at any point at a known distance; the elevation angle can then be measured using the telescope, and the height can be calculated accordingly. An example is provided below:

(1 ) When measuring elevation on flat ground, the total height is calculated as the sum of the observed elevation angle height h1 and the instrument height h2:

h Total height = h1 + h2 (Telescope height)

h1=AB (known distance) tga

(2 ) Elevation angle height when measuring elevation on a slope h1 Add depression angle height h2 Calculate

H Total height = h1 + h2

h1=AB ×tga1

h2=AB times tangent of 2

V. Instrument Maintenance and Precautions

1 The instrument has been calibrated prior to shipment. However, if the instrument has undergone long-distance transportation, impact, severe vibration, or prolonged disuse, the leveling mechanism must be adjusted and the bubble level calibrated before use to ensure that the indicator pointer aligns with the telescope’s line of sight.

2 After use, all adjustment mechanisms shall be returned to their neutral positions and securely locked.

3 The instrument shall be stored in a dry, clean environment to prevent mold growth on optical components and rusting of metal parts.

4 The surfaces of telescope optical components shall be kept free from contamination, and the instrument must be re-verified after maintenance or disassembly before it can be used.

VI. Completeness of the Instrument Set

1 , Telescope — 1 one

2 , Dial Assembly — 1 one

3 , Tripod — 1 one

4 , electronic calculator —1 one

5 , screwdriver — 1 one

6 , User Manual —1 portion

Harbin Optical Instruments Factory Co., Ltd.

HARBIN OPTICAL INSTRUMENT FACTORY LTD.

ground   Address: Jingwei Third Road, Daoli District, Harbin City 32 Number

Post   Editor: 150010

Electricity   Words: 400-030-0319         0451-84286338      

network   Address: www.hrboptical.com           

E-mail： hopt@hopt.cn