Instruction Manual for Huadelin Dust Concentration Alarm Apparatus WKD-6-K
The WKD-6-K series two-wire loop-powered digital control meters are suitable for all two-wire transmitters, such as pressure, differential pressure, temperature, flow rate, pH value
Distance, acceleration, force, etc. Its built-in microprocessor allows for zero point, full scale, decimal point, unit symbol, and other adjustments through two button operations
Alarm, delay, and other settings, as well as reference calibration, can be made without the need for potentiometers or other adjustments. Additionally, two alarm points can be set, outputting two relay contacts
Point control function. Simply connect it in series with the measured circuit, borrowing the transmitter circuit power supply, and it can convert the 4~20mA signal in the measured circuit
The corresponding quantity information is displayed accurately, and the alarm control function is implemented. This meter is in the shape of a pie, with a plastic casing, an outer diameter of φ62/64mm, and a thickness of 29mm.
1. Technical conditions
6. Polarity conversion: Negative signals are automatically displayed as "-", while positive signals are not displayed

1. Service conditions
(1) Through current: Measurement range 3~22mA
The limit range is less than 100 mA
(2) Temperature range: Rated operating range: -20℃~60℃
Ultimate operating range: -30℃ to 70℃
(3) Relative humidity: 20% to 90%RH
(4) Shock vibration: compliant with the environmental testing Group II instruments specified by the Ministry of Electronics Industry
Device requirements.
2. Display mode: LCD (liquid crystal display, LED backlight) digital
Unit symbols and decimal points are displayed, with a font height of 14.2mm.
Sampling rate: 5 times/second
4. Voltage drop under normal use
(1) Voltage drop ≤ 3.2V, 20mA without overcurrent protection
(2) Voltage drop ≤ 4V, with overcurrent protection at 20mA
5. Digital display setting range
⑴ 4mA：－1999～9999
⑵ 20mA：－1999～9999
(3) Set error ±2 characters (note)

Symbol display.
7. Accuracy: linear deviation over the full range ≤±2 digits (note)
8. Temperature influence error (note):
(1) Full scale ≤ 50 ppm/℃ (-20℃ to 60℃)
(2) Zero drift ≤ 5 characters (-20℃ to 60℃)
9. Over-range indication: "-HI-" or "-LO-"
10. Alarm function
(1) Two alarm points, AL1 and AL2, can be set within the measurement range,
Output corresponding two-way relay contacts, with a capacity of 5A for each way.
(2) Three states: no alarm, upper alarm, and lower alarm, with one being selectable.
(3) The alarm delay can be set between 0 and 99 seconds.
⒒ Dimensions: φ62/64×29mm (minor diameter × major diameter × thickness)
Net weight: xx grams
Note: Compared to the specification of 8000 characters at full scale