nn Direct monitoring of mass flow rate eliminates need for ancillary pressure and temperature sensing nn Digital display of mass flow rate on flow body or remote version for panel mounting nn Electronic output of mass flow rate for control or data-logging nn Fast response to changes in flow rate nn Large, straight sensor tube reduces contamination and maintenance down-time nn Platinum sensor eliminates zero drift and ensures long-term repeatability nn Primary standard calibration ensures starting point accuracy and NIST traceability nn CE Approved Gas Mass Flow Meters with Digital Display ierra Instruments' TopTrak® 820 Mass Flow Meter is designed to replace volumetric flow rate devices at a comparable installed cost. No temperature or pressure corrections are required, as in the case of most other flow monitoring devices, such as rotometers, turbine meters or critical orifices. Available in flow ranges from 0 to 10 sccm up to 0 to 50 slpm, TopTrak is suitable for any clean gas flow measurement application. Wetted surfaces are rugged 316 stainless steel, nickel plating, 6/6 reinforced Nylon® and Viton® "O" rings; all are corrosion-resistant. The 820 measures and displays the mass flow rate directly in sccm or slpm. The integral instrument display is tiltable over 180° for easy viewing and can be removed for remote panel mounting. A 0 to 5 VDC or 4 to 20 mA output signal linearly proportional to gas mass flow rate is provided for recording, data-logging or control. This device is widely used in a variety of flow validation and calibration applications‑by dozens of instrument OEMs and in a multitude of laboratory, test and analytical operations. The information contained herein is subject to change without not

DIMENSIONAL SPECIFICATIONS Model 820—Side View Model 820 —Bottom View All dimensions are inches and in parentheses are millimeters. Certified drawings are available on request. FITTING SIZE Performance Specifications Accuracy +/- 1.5% of Full Scale under calibration conditions including linearity over 15° to 25°C and 5 to 60 psia (0.3 to 4 bara). If the meter is mounted with a vertical (up or down) flow path the folowing accuracy de-rating applies: Notes: (1) Do not exceed 150 psig. (2) Difference between inlet pressure and calibrated pressure. Do not exceed ± 10 psig. Gas Pressure 150 psig (10...

ORDERING THE 822/824 Features Parent Instructions: To order the 822/824 please fill in each number block by selecting the codes from the corresponding features below and following pages. Parent Number 822 TopTrak® Mass Flow Meter with Display Flow body constructed of 10.0% glass-filled Nylon 6/6, with Viton® "O" rings and 316 stainless steel sensor. 3.5 digit LCD display. Linear, 0-5 VDC output signal; input power 12-15 VDC. Choice of inlet/outlet fittings. 9-pin "D" mating connector. Calibrated for flow ranges from 0-10 sccm to 0-50 slpm equivalent nitrogen flow; +/- 1.5% full scale accuracy;...