Related Manuals for Omega EWS-RH
Summary of Contents for Omega EWS-RH
- Page 1 User’ s Guide MADE IN Shop online at www.omega.com e-mail: info@omega.com EWS-RH Relative Humidity/Temperature Transmitter...
- Page 2 Toll Free in United Kingdom: 0800-488-488 e-mail: sales@omega.co.uk It is the policy of OMEGA to comply with all worldwide safety and EMC/EMI regulations that apply. OMEGA is constantly pursuing certification of its products to the European New Approach Directives. OMEGA will add the CE mark to every appropriate device upon certification.
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Page 3: Table Of Contents
EWS-RH TABLE OF CONTENTS Relative Humidity/Temperature Transmitter Page General Description ..............1 Unpacking ..................1 Theory of Operation ..............1 Mounting ..................3 RH/Temperature Calculations ..........5 Calibration ..................6 Relative Humidity Calibration Procedure .......6 Temperature Calibration Procedure ........7 Specifications ................8... - Page 4 EWS-RH FIGURES Relative Humidity/Temperature Transmitter Figure Page Figure 1 Mounting Diagram............3 Figure 2 Transmitter Wiring Examples For Current Output..4 Figure 3 Transmitter Wiring Examples For Voltage Output ..4 Figure 4 Relative Humidity Calibration Procedure ..... 6 Figure 5...
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Page 5: General Description
EWS-RH Relative Humidity/Temperature Transmitter General Description The OMEGA Model EWS-RH is a combination dual output, relative ® humidity/temperature transmitter. A thin film temperature compensated, polymer capacitor senses relative humidity while a solid state temperature sensor measures ambient temperature. Independent user selectable 4-20 mA or 1-5 Vdc outputs are provided for both measured parameters via a terminal strip connection. -
Page 6: Theory Of Operation
A 4-20 mA loop is a series loop in which a transmitter will vary the current flow depending on the input to the transmitter. In the EWS-RH the amount of current allowed to flow in the loop will vary depending on the relative humidity or temperature being measured by the sensor. -
Page 7: Mounting
Note: These units are not designed, nor recommended for medical, Explosive Environment or outdoor applications. Mounting OMEGA's EWS Series of sensors and transmitters are designed for wall mounting in locations that are free from dirt, grease, food particles and condensing moisture such as manufacturing clean rooms, computer rooms and laboratory type environments. -
Page 8: Figure 2 Transmitter Wiring Examples For Current Output
EWS-RH Relative Humidity/Temperature Transmitter EWS-RH RELATIVE HUMIDITY OUTPUT EWS-RH TEMPERATURE OUTPUT 72°F – – PROCESS PANEL METER PROCESS PANEL METER – – POWER SUPPLY POWER SUPPLY Figure 2: Transmitter Wiring Examples For Current Output (4-20 mA) EWS-RH RELATIVE HUMIDITY OUTPUT... -
Page 9: Rh/Temperature Calculations
EWS-RH Relative Humidity/Temperature Transmitter RH/Temperature Calculations To calculate % Relative Humidity by measuring current output in milliamperes. Current output - 4 = % RH To calculate Temperature by measuring current output in milliamperes. Current output - 4 x 135 +5 = Temp (°F) -
Page 10: Calibration
To maintain original specifications it is generally recommended that your transmitter be re- calibrated on an annual basis depending on operating conditions. Relative Humidity Calibration Procedure Recommended equipment: Humidity Generator/Calibrator Kit, OMEGA ® Model No.: RHCL-KIT Handheld Digital Multimeter, OMEGA ®... -
Page 11: Temperature Calibration Procedure
EWS-RH Relative Humidity/Temperature Transmitter Temperature Calibration Procedure Recommended equipment: Series 860 Thermistor Meter OMEGA Model No. 865F or 865C ® Series 400 Thermistor Probe, OMEGA ® Model No.: ON-406-PP Handheld Digital Multimeter, OMEGA Model No.: HHM29 ® 1. Remove enclosure cover. -
Page 12: Specifications
EWS-RH Relative Humidity/Temperature Transmitter Relative Humidity Specifications Range: 5-95% (non-condensing) From 5-20%, ± 4% RH Accuracy @ 25°C: From 20-80%, ± 3% RH From 80-95%, ± 4% RH Repeatability: ± 1% RH 5 to 140°F (-15 to 60°C) Temp. Compensation Range:... - Page 13 EWS-RH Relative Humidity/Temperature Transmitter NOTES:...
- Page 14 EWS-RH Relative Humidity/Temperature Transmitter NOTES:...
- Page 15 OMEGA be liable for consequential, incidental or special damages. CONDITIONS: Equipment sold by OMEGA is not intended to be used, nor shall it be used: (1) as a “Basic Component” under 10 CFR 21 (NRC), used in or with any nuclear installation or activity;...
- Page 16 Where Do I Find Everything I Need for Process Measurement and Control? OMEGA…Of Course! Shop online at www.omega.com TEMPERATURE Thermocouple, RTD & Thermistor Probes, Connectors, Panels & Assemblies Wire: Thermocouple, RTD & Thermistor Calibrators & Ice Point References Recorders, Controllers & Process Monitors...