3rd October 2012 Sierra Announcement

Introducing the World’s Most Accurate Thermal Mass Flow Meter

Sierra Instruments

3th October , 2012 Extract from Announcement made today by Matthew J. Olin President  Sierra Instruments 

Today, I am proud to announce, for immediate sale, the much anticipated QuadraTherm 640i / 780i.  This product is easily the finest product Sierra has ever designed and it has all the features and performance to back up this claim.

Introducing the World’s Most Accurate Thermal Mass Flow Meter

From Sierra’s beginning over forty years ago, my Dad and Sierra’s founder, Dr. John G. Olin was driven by the vision of supplying industrial customers with the world’s most accurate thermal mass flow meter. And, he knew that it was a “sensor” game.

The development of an industrialized metal-sheathed sensor in the early 80s was Sierra’s first big step, but Dr. Olin is a driven innovator, and this was only the beginning for someone who saw “Thermal Mass Flow” as his life’s work. Many successful innovations followed, but in 1999 Sierra experienced a major breakthrough with the introduction of our patented no-drift DrySense™ thermal mass velocity sensor.  I then recognized we were on the cusp of realizing my Dad’s life-long vision.

Realizing the Vision

Thermal technology, by its very nature, uses the physics of heat transfer and conservation of energy in a closed system to measure mass flow rate. This means that for a thermal mass flow meter to achieve the greatest accuracy, it must solve the First Law of Thermodynamics (Heat Energy In = Heat Energy Out) for each data point.

As you can imagine, solving the First Law in a flow instrument was no easy task. By Dr. Olin’s own accounting, decades of “hard-nosed dedication to excellence” by himself and Sierra’s engineering team, years of testing, and his stack of yellow note pads over five feet high, jammed with his handwritten equations and designs, finally yielded the secret in the form of two revolutionary new technologies; QuadraTherm™ and iTherm™ both patented worldwide.

Here are a few highlights:

• Accuracy: +/- 0.5% of Reading

• Multivariable: Mass flow rate, temperature & pressure

• Revolutionary QuadraTherm™ four-sensor design

• DrySense™ no-drift sensor with lifetime warranty

• iTherm™ living, learning “Brain” manages all inputs

• Dial-A-Pipe™ : Change pipe size

• Dial-A-Gas™ : Change gas type

• iTherm Gas Library: 18 gases & mixtures (growing & improving)

• ValidCal™ Diagnostics: Assure performance

• Smart Interface Program: Computer interface software

• Foundation Fieldbus, Profibus DP, DeviceNet, HART (all pending)

• IECEx pending

202A Loop Powered Rate Totaliser

Contrec Instruments


The 202A Loop Powered Rate Totaliser is designed to operate with any flowmeter which produces a 4-20mA output, including differential pressure devices, magnetic or vortex flowmeters. The 202A is powered entirely from the 4-20mA current loop and has a maximum of 2.5 volts drop across the input. The Rate Totaliser is fully programmable with linear or square law input relationships, programmable span, cutoffs and conversion factors. A non-volatile memory stores all set up parameters and totals without the need for internal batteries or external power.High and low alarms are standard via optically isolated solid state relay outputs. Alternatively, the high alarm output can be programmed to provide a scaled pulse output proportional to the total.

Watertight enclosure

The 202A Rate Totaliser is housed in a rugged, yet attractive, IP67 (Nema 4X) polycarbonate enclosure which is completely watertight. A wall mounting bracket is supplied as standard, while a 2″ pipe mounting bracket is available as an option. Alternatively, the Model 202A can be supplied as a panel mount instrument.

Intrinsically safe

The Model 202A is certified as intrinsically safe to European CENELEC standards, and CSA standards for both the USA and Canada.

Features at a glance

  • Powered by 4-20mA loop
  • Displays Rate, Total andAccumulated Total
  • Linear or square law inputs
  • High and low flow rate alarm
  • Pulse output
  • Watertight to IP67 (Nema 4X)
  • Wall, pipe and panel mounting
  • Intrinsically safe
  • Fully programmable
  • CE Compliant