Instruction Manual for the YHCD-1500J Intrinsically Safe Laser Ranging and Positioning Pointer for Mining

I. Overview

1.1 , Functional Features

The intrinsically safe laser rangefinder and positioning pointer for mining applications is an instrument that integrates electronics, optics, precision mechanics, and other technologies. It features long-range laser pointing, distance measurement, angle measurement, and height measurement functions. The instrument adopts a split design with a main unit and a controller: the main unit is suspended at a high position, while the controller is mounted at a lower, more convenient operating height, with explosion-proof cable connecting the two. The controller can control the power supply for the laser pointer and display the projection angle and projection distance of the laser line. The instrument boasts an aesthetically pleasing appearance, compact size, light weight, and explosion-proof characteristics. Equipped with a suspension assembly, it can be quickly secured to anchor bolts and can 360° The range can be coarsely adjusted over any span and finely tuned for precision; adjustment is convenient, and the braking mechanism is reliable. The instrument projects a dot laser with a small spot size, high brightness, and minimal spot drift. It features high-precision distance and angle measurement capabilities and can monitor the laser beam’s pointing status in real time. To accommodate underground power supply conditions in coal mines, this product can be powered either by a dedicated DC battery or by a dedicated AC-to-DC power supply.

1.2 , Implementation Standards

This instrument complies with the following standards: GB/T 3836.1-2021 、 GB/T 3836.4-2021 、MT/T870-2000、Q/HGY42-2025 Enterprise standard.

1.3 , Main Application Scenarios

This equipment can provide precise distance measurement, accurate centerline and waistline alignment, laser-based angle measurement, and straight-line alignment for tasks such as the installation of conveyance pipelines, conveyor belts, ventilation ducts, water pipes, and cables in underground coal mines or other tunnel construction faces.

1.4 1. Instrument Model Definition

1.5 , Operating Environment

1.5.1 , Ambient temperature: -20 degrees Celsius ~ +40 degrees Celsius

1.5.2 Relative humidity: ≤95%RH(+20 degrees Celsius time )

1.5.3 Ambient atmospheric pressure: 86kPa~ 110 kPa

1.5.4 In an atmosphere containing explosive gases ( Methane ) In the underground coal mine environment mixed with coal dust

1.5.5 In an environment free of gases or vapors that would visibly degrade the insulation

1.5.6 Pollution Level: 3 Level

II. Structure and Operating Principle

2.1 , Structure

The instrument consists of two main parts: the host unit and the controller. The host unit includes a laser module, optical beam shaping, laser ranging, angle measurement, laser focusing, mounting and suspension components, and horizontal and vertical adjustment mechanisms. The controller comprises a control motherboard, a display screen, a power switch, and other components. The host unit and the controller are connected via an explosion-proof cable. The controller is powered by a dedicated explosion-proof battery box or a DC power supply externally connected through an aviation connector.

2.2 , Operating Principle

After power is applied to the laser module, it emits a continuous laser beam. This beam is then collimated and projected as a spot laser through the optical path system, with a circular spot shape, thereby providing collimation for on-site construction operations.

Range-finding and angle-measuring sensors have been integrated into the laser pointing assembly, enabling measurement of the projection angle of the laser beam relative to the horizontal plane as well as the distance from the laser beam to the projection surface. Power for the laser pointer and the measurement sensors is supplied by the controller via an explosion-proof cable, while angle and distance data are transmitted back to the controller’s display screen through the same cable. The controller is equipped with an external power supply option, allowing connection to a dedicated explosion-proof battery pack or a DC power source.

III. Basic Parameters

3.1, Explosion-proof type: intrinsically safe for mining  

3.2, Explosion-proof marking: Ex ib I Mb

3.3, Laser type: continuous wave laser, circular beam spot

3.4 Laser effective range: 1500

3.5 Effective Range, Spot Diameter, and Spot Drift

3.5.1 The spot on the indicator shall be clearly visible at a distance of 1500 m.

3.5.2 The spot diameter of the aiming device at an effective range of 200 m shall less than or equal to For a 20 mm beam, the spot drift shall not exceed 10 mm.

At an effective range of 800 m, the spot diameter of the aiming device shall less than or equal to For a 40 mm beam, the spot drift shall not exceed 10 mm.

At an effective range of 1500 m, the spot diameter of the aiming device shall less than or equal to For a 60 mm beam, the spot drift shall not exceed 10 mm.

3. 6. The lateral and longitudinal adjustment ranges of the pointer instrument’s fine-tuning mechanism shall be ≥ 4 .5°.

3.7 Other Functions

3. 7.1 Pitch angle measurement range and accuracy of the pointing instrument: Range: ±90 ^o , Accuracy: ±0.1 ^o

3. 7.2 Ranging range and accuracy of the direction-finding instrument: Range: 0.1 m to 200 m; Accuracy: ±0.01 m.

3.8 Power Supply Voltage: DC 3.5 V–DC 6 V

3.9 Operating Current: less than or equal to  350mA

3.10 , Continuous operating time: Continuous operating time ≥ 24 hours (when equipped with a intrinsically safe battery box for mining use)

24-hour continuous operation (associated mining-grade potting and intrinsically safe DC power supply)

3.11 Physical Dimensions: 222 mm × 221 mm × 200 mm (main unit), 142 mm × 163 mm × 38 mm (controller);

3.12 Weight: (main unit + controller) approximately 4.0 kg

3.13 Intrinsically Safe Parameters: U _I : DC 5.8V, I _I : 1.3A, C _I ：0 micro- F, L _I : 0 mH

3.14 Laser output power < 150 mW.

IV. Structural Diagram

V. Electrical Connection Diagram

VI. Installation

6.1 1. Installation of the host

6.1.1 , First, take a φ 20 ~ 22mm The anchor bolts (provided by the user) are driven into the roadway roof for fixation.

6.1.2 , As shown in Figure 5, insert the randomly supplied fixing rod through the mounting holes on the base, and use 2 Secure the mounting rod to the instrument base using a bolt, then pass the threaded plug through the rod’s circular hole and connect it to the locking seat (initially threading in only a few turns). Position the fixing ring so that its notch faces outward and slip it over the locking seat. Next, insert the pre-prepared anchor bolt through the mounting hole in the locking seat, and finally tighten the threaded plug with a wrench to secure the suspension assembly to the anchor bolt. At this point, the main unit is firmly mounted on the anchor bolt.

6.2 , Installation of the controller

After the host is installed, secure the cable connecting the host to the controller with cable ties at an appropriate location on site. The top of the controller enclosure is equipped with mounting holes (Figure 2), allowing the controller to be suspended in a position that facilitates observation and operation. On the side of the controller enclosure is an aviation power-input connector, as shown in Figure 4; align the aviation plug of the matching power supply with the controller’s connector and lock the securing sleeve on the plug.

VII. Instructions for Use

7.1 , Power on. After all instruments have been fully installed, first turn on the power supply switch, then press the power button on the side of the controller to power up the instrument. The controller’s display will light up and emit a “beep” sound, while the main unit will project a laser beam.

7.2 , Adjustment of the host laser pointing

7.2.1、 Rough adjustment. As shown in Figure 5, support the instrument with your hand; if the screw plug is loosened, the instrument can rotate horizontally or move up and down along the anchor bolt; if the fixing rod is loosened, 2 With the bolt tightened, the instrument can be rotated vertically or translated horizontally along the fixed rod. When the laser line is very close to the target point, tighten the set screw and bolt; if a small deviation remains, fine adjustment can be used for alignment.

7.2.2、 Level fine-tuning. As shown in Figure 1, first tighten the vertical adjustment screw, then simultaneously rotate the left and right horizontal adjustment screws in the same direction to move the light spot horizontally. Once properly adjusted, lock both horizontal adjustment screws.

7.2.3、 Vertical fine adjustment. As shown in Figure 1, first tighten the horizontal adjustment screw, then simultaneously rotate the upper and lower vertical adjustment screws in the same direction to make the necessary adjustments; once the adjustment is complete, tighten both vertical adjustment screws.

7.3 , Instructions for Use of the Controller

7.3.1、 Function. The controller can measure pitch angle, slant range, horizontal distance, and elevation difference via sensors. It also features functions such as cumulative construction distance measurement and over-limit pitch-angle alarm. A schematic diagram of the measurements is shown in Figure 6.

7.3.2 , button. The controller has four operation buttons: [ Up key ]、[ Press the key ]、[ Confirm ]、[ Return ] , these four buttons can be used in combination to switch between pages and menus; when numerical input is required, [ The down key is ] Change the cursor position, [ Up key ] It is to modify the value of a specific digit, [ Confirm ] The key is used to enter the next-level menu or to save the entered data. [ Return ] The key returns to the previous menu or cancels.

7.3.3 , measurement. Pressing the power button on the side of the controller powers on both the controller and the laser pointer. Once the controller is powered on, it immediately enters the measurement interface, which displays pitch, slant range, horizontal distance, and total distance. Approximately after powering on... 8S The pitch angle will be displayed in real time. The “total travel” shown on the screen represents the total distance traveled during construction; this value is manually entered and then automatically accumulated by the instrument. Once manually entered and confirmed, the value is saved in the controller.

Briefly press the controller's [ Up key ] Activate laser rangefinding, approximately 1S You will obtain the distance measurement value; after acquiring the distance data, briefly press [ Press the key ] You can switch between displaying “horizontal distance” and “elevation difference.”

After manually measuring the “slant distance,” the displayed value for the “total distance” will change, and it is calculated as follows:

Total distance  =  Total distance saved  +  (Slant distance  -  “Initial Installation Distance.” The “Initial Installation Distance” refers to the distance between the instrument’s initial installation position and the working surface. The “Total Distance” displayed at this time will not be saved in the controller.

7.3.4 “Angle threshold” setting. Access the “Angle Threshold” setting through the “Settings” menu to configure the upper and lower limits for the pitch angle; refer to the input method. 7.3.2 If angle alarm is enabled, on the measurement screen, when the measured angle exceeds the threshold, the instrument will display a flashing icon and sound a beep.

7.3.5、 “Distance Accumulation” setting. Access the “Distance Accumulation” setting through the “Settings” menu. This screen displays “Accumulated Distance,” “New Distance,” and “Initial Distance.” The “Accumulated Distance” is the running total obtained by adding each manually entered “New Distance.” The “Initial Distance” is the distance between the instrument and the working surface at the start of operation. After selecting “Save,” both the “Accumulated Distance” and the “Initial Distance” will be stored in the instrument. The “New Distance” represents the actual travel distance entered for the current movement. For instructions on how to input the “New Distance” and the “Initial Distance,” please refer to… 7.3.2 . If you need to recalculate the cumulative distance, select the “Reset” function to clear both the initial distance and the cumulative distance.

7.3.6、 Accessibility settings. Press and hold the [Confirm] key to enable or disable the keypad beep. Press the [Back] key to return to the power-on screen, and use the arrow keys to adjust the LCD backlight brightness.

VIII. Safety Warnings

8.1 Warning: Do not look directly into the light-emitting window!  

8.2 Warning: Battery charging must be performed in a safe location (above ground)!  

8.3 Warning: Battery replacement is strictly prohibited in explosive environments!

8.4 Warning: The instrument must be powered by a dedicated power source (battery pack or DC power supply)!

IX. Maintenance, Servicing, and Usage Precautions

9.1 When the instrument is not used for an extended period, it should be stored in a cool, dry, and non-corrosive environment.

9.2 1. The optical system is calibrated before the instrument leaves the factory; do not disassemble it arbitrarily. During transportation, handle with care to avoid severe vibration.

9.3 If the device is powered by a battery pack, it is recommended to perform a charge–discharge maintenance cycle every six months during long-term storage to prevent capacity degradation.

9.4、  The window glass of the laser output port should be regularly wiped with lens paper or a soft cloth to ensure the surface is clean and free of dust.

9.5 1. Live maintenance is prohibited; when it is necessary to open the enclosure for maintenance, such work must be carried out in a safe location. During operation and maintenance, the electrical parameters and protective performance of the intrinsically safe circuit must be maintained in accordance with its original design, and the model, specifications, and parameters of components in the product’s intrinsically safe circuit must not be altered.

X. Fault Analysis and Troubleshooting

“If the instrument is not functioning,” please check your instrument according to the table below. If, after inspection, the instrument still cannot operate normally, please contact a service center or the manufacturer.

XI. Maintenance Services

11.1 In principle, maintenance of explosion-proof electrical equipment shall be carried out by the equipment manufacturer. If maintenance is performed in-house, the maintenance organization must possess the necessary inspection and testing facilities, and such maintenance may only be undertaken with the prior consent of the equipment manufacturer. During maintenance, the electrical parameters and protective performance of the intrinsically safe circuit must be maintained in accordance with its original design; the model, specifications, and parameters of components in the intrinsically safe circuit shall not be altered. Following maintenance, explosion-proof parameter measurements and inspections shall be conducted and must meet the required standards. GB3836 Only after meeting the requirements specified herein may the equipment be put into service. The party performing the repair shall bear all related responsibilities arising from such repairs. It is strictly prohibited to power the instrument using a power supply that is not part of the original equipment package.

11.2 , Instrument warranty starts from the date of invoice issuance. 12 months, with lifetime maintenance and calibration after-sales service.

11.3 During the warranty period, any component damage caused by manufacturing defects will be replaced free of charge.

11.4 During the warranty period, any damage not caused by product quality issues shall be subject to appropriate charges.

XII. Product Packing List

1 ．Intrinsically Safe Laser Ranging and Positioning Pointer for Mining  1 Taiwan   

2 ．Fixed rod  1 one  

3 ．Suspension assembly (including screw plug, retaining ring, and locking seat) 1 set     

4 ．Product Certificate of Conformity and Instruction Manual   Each 1 portion

5.  Intrinsically Safe Battery Box for Mining Use (Including Charger) 1 Platform (optional based on actual customer requirements)

6.  Mining-Use Potting and Intrinsically Safe DC Power Supply  1 Platform (optional based on actual customer requirements)

Phone: 0451-84286338

Postal code: 150010

Email :  hopt@hopt.cn

Website :www.hrboptical.com

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