SIGNAL INSTRUMENT 821S Operating Manual

Precision gas divider

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821S OPERATING MANUAL

MODEL 821S

PRECISION GAS DIVIDER

OPERATING MANUAL

The SIGNAL INSTRUMENT Co. Ltd.

12 Doman Road, Camberley

Surrey, GU15 3DF

England

Tel: 01276 682841

Fax: 01276 691302

International

Tel: + 44 1276 682841

Fax: + 44 1276 691302

Part Number 821S/MAN

Page 1 of 13

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Page 1 821S OPERATING MANUAL MODEL 821S PRECISION GAS DIVIDER OPERATING MANUAL The SIGNAL INSTRUMENT Co. Ltd. 12 Doman Road, Camberley Surrey, GU15 3DF England Tel: 01276 682841 Fax: 01276 691302 International Tel: + 44 1276 682841 Fax: + 44 1276 691302...
Page 2 821S OPERATING MANUAL DOCUMENT HISTORY ISSUE AMENDMENT DATE 1.00 First published 2.00 ECN 1000 April 23, 1994 Page 2 of 13 S\masters\manuals\821S...
Page 3: Table Of Contents
821S OPERATING MANUAL CONTENTS INTRODUCTION .……………………………………………………………………………..5 Description ……………………………………………………………………..5 Principle of Operation …………………………………………………………5 SPECIFICATION ………………………………………………………………………………..6 Safety …………………………………………………………………………...6 Power ……………………………………………………………………………6 Pneumatics ……………………………………………………………………..6 Ratios ……………………………………………………………………………6 Performance ……………………………………………………………………6 Remote Option …………………………………………………………………6 INSTALLATION ………………………………………………………………………………….7 Introduction ……………………………………………………………………..7 Location …………………………………………………………………………7 Mains Power Connection ……………………………………………………..7 Gas Connections ………………………………………………………………7 Gas Connections ………………………………………………………………8...
Page 4 While we believe that the information and guidance given in this manual is correct, all parties must rely upon their own skill and judgement when making use of it. The Signal Instrument Co. Ltd. Will not assume any liability to anyone for any loss or damage caused by any error or omission in the manual, whether such error or omission is the result of negligence or any other cause.
Page 5: Introduction
821S OPERATING MANUAL INTRODUCTION Description 1.1.1 The Signal Gas Divider Model 821 has been developed as a primary source of diluted reference gas using a single reference gas and a diluent. Eleven fixed steps give concentrations of 0% to 100% of reference gas in the diluent, in 10% steps.
Page 6: Specification
821S OPERATING MANUAL SPECIFICATION Safety 2.1.1 The instrument has been constructed in accordance with prescribed safety standards. All hazardous circuits are shielded within the instrument. Power 2.2.1 Mains supply 240V ± 15% 50/60 Hz 100 VA 2.2.2 Fuse rating 2A quick blow 5 x 20 mm.
Page 7: Installation
821S OPERATING MANUAL THE GAS DIVIDER MUST NOT BE USED WITHOUT A SAFETY EARTH CONNECTION If hazardous gases are being used, ensure that the OUTPUT port is ALWAYS connected to a safe vent, either via the equipment being calibrated, or directly from the divider.
Page 8: Gas Connections
821S OPERATING MANUAL 3.4.2 3.4.2 ¼” (6.35 mm) O.D. tube is required for all connections; 0.060” (1.5 mm) wall PTFE tube is recommended. Slide the nut and ferrule over the tube. The tubing should be inserted into the tube-fitting aperture...
Page 9: Operation
821S OPERATING MANUAL OPERATION Installation 4.1.1 Install the divider as detailed in the installation section. Set the input gas pressures to 25 psi (1.7 bar, 170 kPa) for the SPAN gas and 35 psi (2.4 bar, 240 kPa) for the ZERO gas.
Page 10: Flow Control
821S OPERATING MANUAL Flow Control 4.4.1 The output flow can be reduced by inserting a restricting device (e.g. needle valve) in series with the output line. 4.4.2 The pressure at the output port should not be allowed to rise to within 5 psi (340 mbar, 34 kPa) of the SPAN gas pressure otherwise incorrect operation may occur.
Page 11: Trace Gases
821S OPERATING MANUAL Z=S·(100·P-P·A) 100·A-P·A S=Z·(100·A-P·A) 100·P-P·A 4.8.3 Using the 821, a series of readings at 10% intervals may be obtained from a suitable detector. After correcting for the detector offset, scale factor, and linearity, the results can be inserted into one of the above formulae to determine the unknown correction factor.
Page 12: Care And Maintenance
Care 5.1.1 The Model 821S Gas Divider has been designed for general use and requires minimal maintenance. The Model 821S Gas Divider is also a precision instrument and will reward you with years of trouble free service by being treated as such.
Page 13 80.1 • Attach gases correct 70.4 10.0 pressures. Switch on. 60.4 10.4 • Set 0% on 821S. 50.0 • Set reading on analyser to 0% 40.1 10.0 • Set 100% on 821S. 30.1 10.2 • Set reading on analyser to 100%.