Paperless Recorders

I. Overview

    The LU-M100 monochrome LCD process-control wood-core detector combines detection, recording and data printing in a single unit and is mainly used in wood heat treatment production. It provides 4 PT100 RTD inputs plus alarm and control outputs, with full isolation between inputs and outputs. The first and second channels measure the temperatures of Wood Core 1 and Wood Core 2. The third and fourth channels measure ambient humidity and ambient (dry-bulb) temperature. The instrument also records and prints data.
Flexible data storage modes: the storage space for records is dynamically adjustable, and each channel has an independently adjustable recording interval; users can select channels and recording intervals as required for data storage. A high-capacity FLASH memory chip stores historical data with retention after power failure, and the internal storage time can reach from 140 hours to 5600 days.
 

    Convenient data processing: connect a micro printer directly to print data and curves for a user-specified period; connect to a portable computer or PDA via the RS232 communication interface to upload real-time/historical data directly, and use the host computer data management software to analyze, archive and print the data; the instrument can also be connected to professional SCADA systems such as KingView and MCGS.
Powerful display functions: extra-large digital display, bar graph display, real-time curve display, historical curve display, alarm query and alarm status display, etc. All curve screens support zooming, and an intelligent automatic playback function for historical trends is provided, with time and amplitude zoom, making alarm points extremely easy to locate. A positioning query function is also provided, allowing direct queries of data for a specific year, month, day, hour, minute and second. A flow statistics function allows querying the cumulative flow value for any period;
 

    The modular design makes configuration more flexible, and different acquisition boards can be used simultaneously; the power supply and acquisition boards are designed in separate layers, and the electrical isolation between inputs and outputs is complete, greatly improving instrument reliability. A Chinese/English bilingual display interface is also provided.
 

II. Technical specifications 

    Display: 128*64 dot-matrix LCD, LED backlight 

    Temperature measurement range: 0-100°C 

    Temperature basic error: ±1°C 

    Humidity measurement range: 0-100%RH 

    Humidity resolution: 1%RH 

    Sampling cycle: 0.5 s 

    Data recording interval setting range: 1 second to 4 minutes.

    Storage time: T = storage capacity / sum of the reciprocals of the recording intervals of all enabled channels; when the storage space is empty, the storage capacity, i.e. the total number of records, is 4000×504. For example, when the data storage is empty and channels 1, 2, 3 and 4 are enabled with recording intervals of 1 s, 5 s, 10 s and 20 s respectively, then T = 4000*504/(1/1+1/5+1/10+1/20) = 1493333.3 s = 414.8 hours = 17.28 days

    Power supply: AC220V±10%, 50Hz±2Hz

    Ambient temperature: 0-45°C

    Ambient humidity: 0-85%

    ► Wiring of the temperature probes

      1. Wiring of the wood core temperature probes

      Connect the wood core temperature probes (the two longer pairs) to the “Wood Core 1” terminals (A1, A3, A5) and “Wood Core 2” terminals (A9, A11, A13) on the rear panel of the instrument. Connect the red wires to terminals A1, A3, A9 and A11, and the white wires to A5 and A13.

      2. Wiring of the dry-bulb and wet-bulb temperature probes 

      Connect the two pairs of temperature probes (the two shorter pairs) to the “Wet-bulb temperature” terminals (A2, A4, A6) and the “Dry-bulb temperature” terminals (A10, A12, A14) on the front panel of the instrument. Connect the red wires to terminals A2, A4, A10 and A12, and the white wires to A6 and A14.

    Wiring of the control outputs

      1. B1 and B3 are the upper-limit alarm control terminals for Wood Core 1; B5 and B7 are the lower-limit alarm control terminals for Wood Core 1; B9 and B11 are the upper-limit alarm control terminals for Wood Core 2; B13 and B15 are the lower-limit alarm control terminals for Wood Core 2.

      2. B2 and B4 are the on/off (two-position) control terminals for ambient (dry-bulb) temperature.

      3. The printer and external communication share the RS232 communication port of the instrument. When using a printer, short-circuit terminals B12-B20 and B14-B18. When using external communication, remove the shorting links between B12 and B20 and between B14 and B18, then connect B16 (GND), B18 (TXD) and B20 (RXD) to the PC serial port pins GND (5), RXD (2) and TXD (3). If RS485 communication is required, it can be specially customized.