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© Compact Instruments Ltd 2017
www.compactinstruments.co.uk
email: sales@compactinstruments.co.uk
Document No: 13696/2
Operating Instruction
Model A2106
Diesel engine Tachometer
Phone: (0044) 0 1204-532544
Fax : (0044) 0 1204-522285
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Advent diesel Tachometer
Model A2106
General description
Featuring a patented “Inverting” vertical LCD di splay which gives extremely good flexibility in
operation in almost any application, the instrument can be used in the normal mode or with the display
inverted for applications where access is difficult within confined areas.
The vertical display aids measurement through almost 270º. of operating angle where the user can read
the display readily throughout.
Hands free operation - once the instrument is turned on it will automatically remain powered up as long
as it is receiving input pulses.
Display features & Specification
Display - Inverting LCD Vertical 5 digit display
Display functions - 180º. Inverting
On target indicator - Yes
Low Battery indicator - Yes
Function icons - rpm, rpm ×2 (1:2), Mx
Controls - 3 push-buttons
On/off normal mode - Dual action rocker type touch push-button (UP ARROW)
On/off inverted mode - As above but for inverted operation (DOWN ARROW)
Program control - Selects 1 pulse/rev or 1 pulse/2revs mode (1:2 symbol)
Measurement range
Measurement ranges - rpm , rpm ×2 , maximum speed capture (in both ranges)
Speed range rpm - 100 - 8,000 rpm
Resolution maximum - ± 1 rpm
Accuracy - ±0.05% ±10 rpm (± 0.5% maximum speed capture)
Timebase - 0.8 seconds normal mode
0.1 seconds in maximum speed capture mode
Memory features - Last reading held for 5 seconds, automatic power down 4.5 minutes
after last input pulse received or last button pressed
Power requirements - 4 x AAA alkaline cells
Standard kit - Includes operating instructions, Remote carrycase and your choice of transducer
(order separately)
Operation of the Instrument
rpm measurement
1 Check that the transducer is the correct size for the injector pipe. Select any convenient
injector pipe and choose a position which is straight for at least 20mm. Clean all paint and
corrosion from the pipe using an abrasive, wipe clean and fit the transducer. Do not use
excessive force when tightening transducer. Do not rotate or slide the transducer when
clamped as damage can occur. Connect transducer cable to the B.N.C. socket on the Diesel
tachometer. Push the ¼” (6.35mm) cable receptacle onto the transducer blade terminal and
connect the earth clip to a convenient earth point. Ensure all cables are clear of hot
manifolds, fans or other rotating components, before starting the engine.
2 Start the engine. Momentarily press one of the ON buttons to turn the instrument on. The on
target icon will glow or flash steadily. If not re-position the transducer.
3 The diesel tachometer has been factory set to 1:2. This is suitable for all types of diesel
engine except 2 stroke. Should it become necessary to change this mode press both the
Program button and one of the ON buttons at the same time and release, the current range
icons will flash, pressing either of the ON buttons will toggle the range icons. To confirm the
selection press the Program button once.
4 To use in an inverted orientation simply press the Down button once and the display will
automatically invert.
5 Maximum speed capture- To enable maximum speed capture mode press the Program
button once, the instrument will now switch to fast timebase mode, the Mx icon will be visible
and from now on the display will only change if the current speed is the highest since the
Program button was pressed. To reset the maximum value ready to capture another reading,
press the ON button once.
6 To exit the maximum speed capture mode press the Program button once, the Mx icon will
then turn off and the Timebase will revert to 0.8Secs and will continuously display the current
speed.
Typical transducer
Available transducers
DES/09 4.5mm pipes
DES/10 6mm pipes
DES/11 6.35mm pipes
DES/12 8mm pipes
DES/14 7mm pipes
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