Model 2805 DME


These revolutionary veneer testers allow you to measure density, moisture content, and modulus of elasticity (E) simultaneously, in every sheet of veneer, with unsurpassed accuracy and speed.

  • Determines modulus of elasticity (E), specific gravity, density, average and peak moisture content, plus sheet thickness (optional)
  • Compensates for veneer temperature and moisture content
  • Detects veneer sheet width
  • Includes system diagnostics with alarm system for common faults
  • Features RF microwave technology
  • Increases your profits with greater yield from the same material resource
  • Frame splits in half for easy installation around existing conveyor flights
  • Speeds up to 600 to ft/min

The Models 2805 DME grade veneer for structural applications. Ultrasonic, infrared, and radio frequency technologies collect and process data for each veneer sheet. Measured values for moisture content, temperature, Ultrasonic Propagation Time (UPT), width, and specific gravity are combined to characterize and sort veneer to mill standards. Software algorithms process signals from the ultrasonic transducer wheels. Ultrasonic Propagation Time (UPT) is derived from this signal path. The electronics system also generates signals for the radio frequency resonator cavity pairs. Five resonator pairs are standard, but up to six pairs can be mounted in the veneer tester, depending on the customer’s conveyor belt arrangement.

A shaft encoder measures veneer width and line speed, while temperature is measured by a highspeed infrared thermometer. Average UPT, compensated for temperature, and signal responses from the resonator cavities are analyzed to determine the specific gravity, density, and moisture content. All of these properties’ values are displayed immediately on the monitor. Veneer grade determined from various programmed combinations of the measured properties. The grade is marked on each sheet by spray nozzles for up to eight grades. An RS232 serial port and remote monitor port are provided to aid your quality control staff. Models 2655 DFX and 2700 VITKA can be upgraded to a Model 2805 DME.


Each Model Model 2805 is one integral unit including:

  • Transmitter drive signal control and transducer
  • Receiver transducers and signal processing
  • Resonator cavity pairs and drive signal generation
  • Resonator cavity signal processing
  • Photo sensors to locate leading and trailing edges of veneer
  • Precise, crystal clock-based time measurement
  • Infrared temperature measurement and compensation
  • Shaft encoder for width measurement
  • Software for multiple, simultaneous grade determination based on operator-set thresholds
  • System diagnostics to detect common faults, activate alarms, and log the faults
  • Spray mark drivers for up to eight grades
  • Parallel output to relays for interfacing with plant controls
  • Support frame.

Machine Frame

The machine frame disassembles for ease of installation, eliminating the need for cutting the conveyor flights. Conveyor dimensions including height, number of belts, width of flights, and position of veneer on belts, should be specified at time of order so your machine can be built to fit your conveyor line. If not specified, your 2805 DME will be assembled using a standard arrangement.


  • An infrared thermometer is positioned above the material flow to measure the wood temperature.
  • The resonator cavities are suspended above and below the conveyor line.
  • Two photo sensor pairs, one at each end of the tester, alert the system to the presence of veneer.
  • An encoder transducer, mounted on a shaft coupled to the conveyor, detects sheet width and line speed.

Power Requirements


95-130, 175-235, 380-520 Vac, 1 kVA, 60 Hz, single‑ phase (50 Hz available). Customer supplies necessary fuse disconnects and field wiring as required.


Air connection for 60 to 100 psi (shop air) for spray mark equipment, transducer air springs, and infrared thermometer.


Mechanical belt drive and connection turn veneer support wheels at the speed of the conveyor belts for speed match.

Computer Interface

Operator Interface

Full-size keyboard and display mount on the machine frame.

Serial Data Output

RS232 port. For each veneer sheet: ASCII value of temperature-corrected E; temperature-corrected UPT; specific gravity; moisture content; number of ultrasonic samples per sheet; number of RF scans; temperature; width; and grade.

Design Details

Conveyor Line Speed

Up to 600 ft/min (183 m/min)

Veneer Size

Length 48–126 in (122–320 cm) Width 12–54 in (30.5–137 cm) or specify

Veneer Thickness

From 1/10 – 1/6 in (2.54 to 4.24 mm)

Grade Determination

Up to 8 grade categories set by operator with adjustable thresholds for temperaturecorrected E and UPT, specific gravity, moisture content, and width. All grades can be spray-marked. Ink spray system and supplies optional.

Grade Computation

From E, average of UPT readings, number of UPT readings, specific gravity, peak and/or average moisture content, skew, & width. Any combination of measured quantities can be used in 3 independent grading sets to determine the grade for the sheet in each set.

Electronic Packaging

Steel enclosure with polycarbonate window.

Shipping Dimensions

Frame and Electronics (weight)

Approximately 2,000 lbs (1100 kg)

Frame and Electronics (size)

156 x 35 x 66 in (3960 x 890 x 1675 mm)

Thickness Sensor

Measures average veneer sheet thickness. Auto-zero. 265-OPT-1004 (with new order) or 265-OPT-1003 (field retrofit)

Current Loop Output

Four each 4–20 mA outputs. Four or fewer of the following values can be set in the configuration file to be output: Specific gravity, UPT, E, average and/or maximum moisture, width, thickness (if so equipped), or grade. 270-OPT-1001

Stand-alone Electronics Mount

Independent support of the electronics cabinet to mitigate vibration interference. 265-KIT-1160

Ink Nozzle Assembly

Nozzle, solenoid valve, cable, mount and fittings. 260-ASM-1001

Short Frame

For maximum veneer lengths of 82.7 in (2100 mm). Requires four cavity pairs. 280-BAS-1002

Moveable Transducer Wheels

Allows different lengths of veneer to be run. Requires additional backup wheel for each alternative wheel location. 260-OPT-1004

Ink Supply Tank

3-gallon air-pressurized with regulator, gauge, and fittings required for each ink color. PNE-FIT-1021

Mechanical Drive

Set up to drive machine from conveyor belt. 260-KIT-1001

CE Mark

Machine produced in conformance with CE requirements. Includes Manufacturer’s Declaration of Conformance. 280-OPT-1001

For Models 2655 and 2805, if you don’t have spare transducer wheels on hand, rental replacement wheels are available from Metriguard while your own wheels are returned to Metriguard for repair. Call for details.

Pictured below is a typical electrical spares kit for the Model 2805 (280-KIT-1002), along with a list of the parts included in the kit, and their part numbers. Also included in the kit but not shown are one each: transmitter cavity, receiver cavity, and a clear keyboard overlay. These parts (and more) are also available for purchase separately as needed. Call Metriguard for details.

Item Description Part Number Qty
1 Floppy drive, 3.5” internal 000-ELE-1005 1
2 Nozzle ink assembly 260-ASM-1001 1
3 PC104 Computer stack 280-ASM-1001 1
4 Output Module, 15Vdc/24-280Vac MIS-ELE-3001 1
5 Output Module, 15Vdc/5-60Vdc MIS-ELE-3003 1
6 Urethane cushion MIS-SPR-1066 2
7 Fuse, 5x20mm 2A GMA2 PAN-FUS-1004 2
8 Fuse, 3AG 2A PAN-FUS-1006 1
9 Fuse, 5x20mm 100mA, slow blow PAN-FUS-1019 2
10 Fuse, 2A Nano SMT PAN-FUS-3000 2
11 Power supply +/-15 +/-5 sw POW-DCO-1222 1
12 2650 Processor, 2-channel PRN-R3DR 1
13 2700 VITKA receiver board PRN-R1RE 1
14 2700 VITKA transmitter board PRN-R1TR 1
15 Ultrasonic Transmitter board PRN-V3TR 1
16 Optical Encoder, 1024ct SEN-OPT-1005 1
17 Photosensor receiver SEN-OPT-1010 1
18 Photosensor transmitter SEN-OPT-1011 1
19 Thermometer, IR hi-speed, low temp SEN-OPT-1024 1
20 Cable TNC-90/BNC-90 RG58 48” WIR-MUL-1102 1
21 Cable BNC-90/BNC RG58C/U 19’ WIR-MUL-1100 2