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Summary of Contents for Kahn SF82
- Page 1 SF82 Dewpoint Transmitter User’s Manual KAHN INSTRUMENTS, INC. 885 Wells Road, Wethersfield, CT 06109 Phone: 860-529-8643 Fax: 860-529-1895 E-mail: hygros@kahn.com www.kahn.com...
- Page 2 SF82 Transmitter User’s Manual SF82 For more information, please visit www.kahn.com Issue 1, June 2019...
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Page 3: Table Of Contents
SF82 Transmitter User’s Manual CONTENTS Safety ......................... v Electrical Safety ......................v Pressure Safety ......................v Toxic Materials ......................v Repair, Maintenance and Calibration ................v Safety Conformity ....................... vi Abbreviations ......................vi Warnings ........................vi 1. INTRODUCTION ..................... 1 2. - Page 4 Figure 4 Cable Connections ....................4 Figure 5 Connector Installation .................... 5 Figure 6 2-Wire Connection Diagram ................... 5 Figure 7 Maximum Load of SF82 - Including Cable Resistance..........6 Figure 8 Installation Location ....................7 Figure 9 Installation Location ....................8 Figure 10 Transmitter Mounting - Sensor Block ..............
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Page 5: Safety
This instrument is designed to be electrically safe when used with the options and accessories supplied by Kahn Instruments for use with it. This instrument has been independently verified as complying with the IEC/EN 61010 Standard for Electrical Safety for Europe and for the equivalent 61010 standards in use in North America. -
Page 6: Safety Conformity
SF82 Transmitter User’s Manual Safety Conformity This product meets the essential protection requirements of the relevant EU and US standards and directives. Abbreviations The following abbreviations are used in this manual: barg pressure unit (=100 kP or 0.987 atm) (bar gauge) ºC... -
Page 7: Introduction
SF82 Transmitter User’s Manual 1. INTRODUCTION The Kahn Instruments SF82 is a loop-powered dew-point transmitter, designed to make dew point measurements in a flowing sample. The SF82 transmitter is available with 3 different process connections: • 5/8” - 18 UNF •... -
Page 8: Installation
SF82 Transmitter User’s Manual 2. INSTALLATION 2.1. Unpacking the Instrument On delivery, please check that all the following standard components are in the packing box: • SF82 Transmitter • Certificate of Calibration • Connector (for sensor/cable) for MiniDIN 43650 C version only It is recommended that all packaging be retained in case transmitter is returned for service or calibration. -
Page 9: Preparation Of The Sensor Cable
SF82 Transmitter User’s Manual 2.2. Preparation of the Sensor Cable The sensor cable is NOT supplied as standard. Cables can be obtained by contacting Kahn Instruments. DIN 43650 Version Cable connections to the SF82 transmitter are made via the removable connector. Removing the central screw enables the connector terminal block to be removed from the outer housing by using a small screwdriver to pry it clear. -
Page 10: Figure 3 Sensor Connector Installation
(see figure 3) before the power is applied. Without this connection, the transmitter may be damaged if allowed to operate for prolonged periods. M12 5-Pin Version Cables with moulded M12 connectors are available from Kahn Instruments in the following lengths: • 2.6 FT • 6 FT •... -
Page 11: Cable Connection
If longer cable runs are required, off the shelf 5-pin M12 cables can be connected between the SF82 transmitter and the cable provided by Kahn Instruments. Note: The cable screen should only be connected to ground point at either the transmitter installation side or at the receiving equipment. -
Page 12: Electrical Boundaries
Figure 7 Maximum Load of SF82 - Including Cable Resistance 2.4.2. Digital Communications (M12 Version Only) Modbus RTU over RS485 communication is available on the SF82 M12, and can be used simultaneously with the 2-wire current output. Section 2.2 describes the electrical connections to the transmitter. -
Page 13: Figure 8 Installation Location
SF82 Transmitter User’s Manual The basic considerations for each measurement type are as follows: Direct Insertion 1. Dewpoint Sensor Position – Will the sensor see an environment that is representative of what you want to measure? For example, if the sensor is to be mounted into a glove box, there are three different positions in which it could be installed –... -
Page 14: Figure 9 Installation Location
SF82 Transmitter User’s Manual Figure 9 Installation Location 2. Gas speed – if you are planning on installing the sensor in a duct, consider how fast the sample gas is moving through it. • If the gas speed is very low, or occasionally static, then the moisture content through the length (and width, if it is more than a few inches across) of the duct is unlikely to be uniform. -
Page 15: Good Measuring Practice
SF82 Transmitter User’s Manual Figure 10 Transmitter Mounting - Sensor Block 2.5.2. Good Measuring Practice Insuring reliable and accurate moisture measurements requires the correct sampling techniques, and a basic understanding of how water vapor behaves. This section aims to explain the common mistakes and how to avoid them. - Page 16 SF82 Transmitter User’s Manual What this demonstrates is the dramatic effect that different tubing materials have on the humidity levels of a gas passed through them. Many materials contain moisture as part of their structure and when these are used as tubing for a dry gas the gas will absorb some of the moisture. Always avoid using organic materials (e.g.
- Page 17 SF82 Transmitter User’s Manual Maintaining the temperature of the sample system tubing above the dew point of the sample is vital to prevent condensation. Any condensation invalidates the sampling process as it reduces the water vapor content of the gas being measured. Condensed liquid can also alter the humidity elsewhere by dripping or running to other locations where it may re-evaporate.
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Page 18: Transmitter Mounting
SF82 Transmitter User’s Manual Dead volumes (areas which are not in a direct flow path) in sample lines, hold onto water molecules which are slowly released into the passing gas. This results in increased purge and response times, and wetter than expected readings. Hygroscopic materials in filters, valves (e.g. - Page 19 SF82 Transmitter User’s Manual • Do not touch the sensor guard • Assume the bonded seal washer or o-ring seal is in place prior to screwing in the transmitter • Screw in the transmitter by hand using the wrench flats only •...
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Page 20: Figure 13 Replace Hmwpe Guard
SF82 Transmitter User’s Manual Calibration Annual recalibration of the SF82 is recommended to maintain the performance. Calibration services traceable to the US National Institute of Standards and Technology (NIST) are provided by Kahn Instruments. Sensor Guard Replacement The sensor is supplied with a white HMWPE guard (standard) or a stainless steel guard (if specified at time or order). -
Page 21: Appendices
SF82 Transmitter User’s Manual APPENDIX A Technical Specifications Kahn Instruments... -
Page 22: Technical Specifications
SF82 Transmitter User’s Manual Technical Specifications Performance SF82 MiniDIN 43650 SF82 M12 Product Measurement -76 ºF to +140 ºF (-60 ºC to +60 ºC) dew point Range (Dew Point) Accuracy (Dew ±3.6 °F (±2 °C) dew point* Point) 63% at room temperature at 1 bara -76 ºF to +68 ºF (-60 ºC to -20 ºC) dew point: 6 s... - Page 23 SF82 Transmitter User’s Manual IEC61010-1, UL61010-1 & CAN/CSA Electrical IEC61010-1, UL61010-1 & CAN/CSA C22.2 No. 61010 Safety C22.2 No. 61010 EN61373 Rail Rolling Stock EN50121-3-2 Rail EMC/RFI Operating Specifications Operating -4 °F to +140 °F (-20 °C to +60 °C)
- Page 24 SF82 Transmitter User’s Manual (factory Over-range dew point: mA programmed) NOTES: * Over Compensated Temperature Range Issue 1, June 2019...
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Page 25: Product Dimensions
SF82 Transmitter User’s Manual Product Dimensions M12, 5/8” UNF M12, G1/2 M12, 3/4" UNF Kahn Instruments... - Page 26 SF82 Transmitter User’s Manual MiniDIN, 5/8” UNF MiniDIN, G1/2 MiniDIN, 3/4” UNF Issue 1, June 2019...
- Page 27 SF82 Transmitter User’s Manual G1/2 5/8” UNF 3/4” UNF Quick Connect Kahn Instruments...
- Page 28 SF82 Transmitter User’s Manual APPENDIX B Modbus Register Map Issue 1, June 2019...
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Page 29: Modbus Register Map
SF82 Transmitter User’s Manual Modbus Register Map All the data values relating to the SF82 are stored in 16-bit wide holding registers. Registers can contain either measured or calculated values (dew-point, temperature, etc.), or configuration data (output settings). Modbus RTU Implementation... -
Page 30: Register Address
SF82 Transmitter User’s Manual Register Address Access Data Description Comment Type Instrument Modbus uint16 Address uint16 Instrument ID Batch 0xA123 Serial 0x0001 uint16 Sensor Batch Number Complete sensor serial would be A123-001 uint16 Sensor Serial Number uint16 Firmware Version Divide by 1000, ie 12003 = V12.003... - Page 31 SF82 Transmitter User’s Manual float ppmV Ideal Gas (High Word) ppmV Ideal Gas (Low Word) … … float Pressure Value (High Used for ppmV Ideal Gas calculation Word) Pressure Value (Low Word) … … uint16 Analogue Output 0 = Off...
- Page 32 SF82 Transmitter User’s Manual Parameter Ranges Dew Point -150 Temperature -150 ppmV 30000 Issue 1, June 2019...
- Page 33 SF82 Transmitter User’s Manual NOTES: Kahn Instruments...
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