FEATURES

Attractive tabletop instrument.

Hand-blown glass parts in strong borosilicate glass.

Quality materials using brass fittings.

Ingenious temperature compensation method.

Fully adjustable for height above sea level.

Fully temperature compensated.

helical measurement tube for easy, precise reading.

Integral thermometer.

Colourful, non-toxic thermometric and barometric fluids for accuracy and readability.

Informative guidebook for easy set up and use.

Full warranty and after-sales service.

ORDERING

The TTS002 table-top Sympiesometer can be yours, inclusive of carriage for £399.99 plus VAT

Ordering is simple: place your order via email.

You will be sent an invoice which you can settle by cheque or by on-line bank transfer.

Your order will be handled efficiently and with care and despatch will be confirmed to you via email.

Please note that Meteormetrics Instruments are hand-built, tested and calibrated to order and will be supplied within 28 days of your order being received.

Introducing the Meteor-Optic TTS002, An All-glass temperature compensated Sympiesometer

This instrument embodies a compensation system which makes it easy to read an accurate figure for the barometric pressure at any temperature in its working range.

The device consists of a captive gas volume, adjustable using a brass thumbwheel, connected to a glass helix dipping under the surface of coloured fluid as in model TTS001. It differs from the latter, however, in that it incorporates a thermometer, the bulb of which is enclosed by the captive gas vessel and the stem of which extends downwards along the axis of the glass helix.

The thermometer is designed to exhibit a rate equal to the expansion rate of the air in the captive gas vessel so that the thermometer thread keeps pace with the level of liquid in the glass helix. Thus the vertical distance between the level in the helix and the position of the thermometer thread will give the atmospheric pressure directly in millibars. Moreover, the helix provides an expansion of scale. Each full turn represents 10 millibars, so the user can easily read the pressure to a precision of one millibar by observing the radial position of the meniscus around the helical turn. Thus it is possible to read the pressure rather as the hour is read on a clock face.

This results in an instrument, which though made almost entirely of glass and without a scale, can be used to read the atmospheric pressure to a high degree of accuracy.

SETTING UP THE TTS002
To give an idea of the precision and elegance of this instrument, here are the instructions for setting up and reading the TTS002 Compensated Sympiesometer
1) Carefully remove the instrument from its packing, gently ease out the cork stopper and withdraw the inner glass assembly from the outer cylinder. Remove packing material.
2) Pour the barometric fluid provided into the glass outer cylinder. Use all the fluid provided.
3) Carefully replace inner glass assembly, reinserting the cork stopper gently.
4) Choose a safe place for your sympiesometer, away from draughts and out of direct sunlight, and reasonably constant in temperature.
5) Leave for three hours to reach a stable temperature.
6) Obtain a reading for the atmospheric pressure at your location in millibars.
7) Note the difference between this reading and 1000mB.
8) Rotate the entire instrument until the end of the thermometer thread is exactly level with the top of a turn of the glass coil. This point represents a pressure of 1000 millibars.
9) Allowing 1 whole turn per 10 millibars calculate the number of turns and fractions of a turn represented by the difference obtained in step 7.
10) If the current atmospheric pressure is less than 1000 millibars, the desired level of liquid in the coil will be below the 1000mB reference point in step 8. Conversely, if the current pressure is higher than 1000mB, the desired liquid level will be above the 1000mb reference level in step 8.
11) Carefully turn the larger knurled thumbwheel clockwise. The liquid level will rise in the glass coil.
12) Continue rotating the thumbwheel until the liquid level reaches the height appropriate to the current pressure. This will be the difference calculated in step 9, higher than (if the pressure is higher than 1000mB), or lower than (if the pressure is less than 1000mB) the reference point of step 7.
13) The instrument is now set up.
READING THE INSTRUMENT:
1) Rotate the entire instrument until the end of the thermometer thread is level with the top of a glass coil.
2) Read the pressure by observing the position of the liquid level.
3) If it is above the end of the thermometer thread, the pressure is above 1000mB
4) If it is below the end of the thermometer thread, the pressure is lower than 1000 mB.
5) Note the number of turns or fractions of turns above or below, and allowing 10 mB per turn, read off the atmospheric pressure.