Omega EWS-RH Manual de usuario

www.omega.com

e-mail: [email protected]

User’s Guide

EWS-RH

Relative Humidity/Temperature

Transmitter

MADE IN

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Servicing North America:

USA: One Omega Drive, Box 4047

ISO 9001 Certified Stamford CT 06907-0047

Tel: (203) 359-1660 FAX: (203) 359-7700

e-mail: [email protected]

Canada: 976 Bergar

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e-mail: [email protected]

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e-mail: [email protected]

OMEGAnet®Online Service Internet e-mail

www.omega.com [email protected]

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.

The information contained in this document is believed to be correct, but OMEGA Engineering, Inc. accepts

no liability for any errors it contains, and reserves the right to alter specifications without notice.

WARNING: These products are not designed for use in, and should not be used for, human applications.

TABLE OF

CONTENTS

EWS-RH

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

FIGURES EWS-RH

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 Temperature Calibration Procedure ............................... 7

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.

Unpacking

Remove the packing list and verify that you have received all your

equipment. If you have any questions about the shipment, please call

our Customer Service Department at

1-800-622-2378 or 203-359-1660. On the web you can find us at:

www.omega.com e-mail: [email protected]

When you receive the shipment, inspect the container and equipment

for any signs of damage. Note any evidence of rough handling in

transit. Immediately report any damage to the shipping agent.

NOTE: The carrier will not honor any damage claims unless

all shipping material is saved for inspection. After

examining and removing contents, save packing material

and carton in the event reshipment is necessary.

The following items are supplied in the box with your transmitter.

This Manual, # M-3501 (1 ea.)

Dewpoint Card (1 ea.)

#6 Wall Anchor (2 ea.)

#6 Mounting Screw (2 ea.)

NOTE

EWS-RH

Relative Humidity/Temperature Transmitter

Additional EWS Series Models Available

Model Description

EWS-TC-(*) Wall mount thermocouple sensor

(* = insert type,J, K, T, E)

EWS-RTD Wall mount RTD sensor (100 Pt., .00385)

EWS-TX Wall mount solid state temperature transmitter

EWS-BP-A Wall mount barometric pressure transmitter

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.

Some advantages of a current output over a voltage output is that the

signal measured is less susceptible to electrical noise interference and

the loop can support more than one measuring instrument as long as

the maximum loop resistance is not exceeded.

A typical application utilizing a current loop will normally consist of a

power supply, the transmitter and a meter, recorder or controller to

measure the current flow. The loop resistance in the sum of the

measuring instruments and wire used. The maximum allowable loop

resistance for the EWS-RH to function properly is found by using the

following formula:

Rmax = (power supply voltage - 8 volts)/.02 amps

For applications that require a voltage output signal the EWS-RH has a

built-in 250 Ohm shunt resistor that will convert the transmitters

output to a 1-5 Vdc signal when wired correctly. See "Transmitter Wiring

Examples" in this manual.

Recommended Accessories

Power Supply, OMEGA®Part No.: PSU-93

Shielded 4-conductor cable, OMEGA®Part No.: TX4-100

Conduit Box Mounting Kit, OMEGA®Part No.: EWS-MB

EWS-RH

Relative Humidity/Temperature Transmitter

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. Plastic wall anchors and

mounting screws are included for mounting to standard wallboard. A

conduit box mounting bracket/wall plate adapter kit is also available

as an option that will allow the transmitter to be mounted to a standard

electrical conduit box.

Order OMEGA®Model No.: EWS-MB.

Figure 1: Mounting Diagram

NOTE

COVER PLATE

GROMET

ADAPTER PLATE

CONDUIT BOX (NOT INCLUDED) IS SHOWN FOR

REFERENCE ONLY

EWS-RH

Relative Humidity/Temperature Transmitter

Figure 2: Transmitter Wiring Examples

For Current Output (4-20 mA)

Figure 3: Transmitter Wiring Examples

For Voltage Output (1-5 Vdc)

EWS-RH RELATIVE HUMIDITY OUTPUT

PROCESS PANEL METER

POWER SUPPLY

44%

–

5432

EWS-RH TEMPERATURE OUTPUT

PROCESS PANEL METER

POWER SUPPLY

72°F

–

5432

EWS-RH RELATIVE HUMIDITY OUTPUT

PROCESS PANEL METER

POWER SUPPLY

44%

–

5432

EWS-RH TEMPERATURE OUTPUT

PROCESS PANEL METER

POWER SUPPLY

72°F

–

5432

EWS-RH

Relative Humidity/Temperature Transmitter

RH/Temperature Calculations

To calculate % Relative Humidity by measuring current output in

milliamperes.

(Current output - 4 )= % RH

.16

To calculate Temperature by measuring current output in milliamperes.

(Current output - 4 x 135 ) +5 = Temp (°F)

RH Measured Vs Output Reading Temperature Measured Vs

Output Reading

% Relative Output

Humidity Current(mA) Voltage(Vdc)

5 4.8 1.2

10 5.6 1.4

15 6.4 1.6

20 7.2 1.8

25 8 2

30 8.8 2.2

35 9.6 2.4

40 10.4 2.6

45 11.2 2.8

50 12 3

55 12.8 3.2

60 13.6 3.4

65 14.4 3.6

70 15.2 3.8

75 16 4

80 16.8 4.2

85 17.6 4.4

90 18.4 4.6

95 19.2 4.8

Temperature Output

°C (°F) Current(mA) Voltage(Vdc)

-15 (5) 4 1

-10 (14) 5.07 1.27

0 (32) 7.20 1.80

10 (50) 9.33 2.33

20 (72) 11.94 2.99

30 (86) 13.60 3.40

40 (104) 15.73 3.93

50 (122) 17.87 4.47

60 (140) 20 5

Calibration

Your transmitter has been factory calibrated to meet or exceed the

specifications outlined in this manual. 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®Model No.: HHM29

Note: Do not make adjustments to potentiometer “P3”, this

is a factory setting and is not field adjustable. If “P3” is

disturbed the transmitter will need to be returned to the

factory for service.

1. Remove enclosure cover

2. Connect transmitter as shown in figure below.

3. Apply power to transmitter and allow to warm up for 15 min.

4. Place sensor in a 20% RH environment and allow to stabilize for 20 min.

5. Adjust potentiometer “P1” for a output reading of 7.2 mA

6. Place sensor in a 80% RH environment and allow to stabilize for 20 min.

7. Adjust potentiometer "P2" for an output reading of 16.8 mA

8. Repeat steps 4, 5, 6, 7 as necessary until proper readings are maintained.

9. Calibration complete.

Figure 4: Relative Humidity Calibration Procedure

NOTE

EWS-RH

Relative Humidity/Temperature Transmitter

MULTIMETER

POWER SUPPLY

–

5432

16.80 mA

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