Omega HX93DA, HX93A User Manual

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User’s Guide

HX93A, HX93DA SERIES

RH/Temperature Transmitter

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

TABLE OF

CONTENTS

HX93A, HX93DA SERIES

RH/Temperature Transmitter

i

Section Page

1. General Description .................................................................... 1

2. Unpacking .................................................................................... 1

3. Theory of Operation ................................................................... 2

4. Mounting ..................................................................................... 3

5. Electrical Connections ................................................................ 4

6. Current Transmitter Wiring Examples .................................... 4

7. Voltage Transmitter Wiring Examples .................................... 5

8. Relative Humidity Output Calculations ................................ 5

9. RH Measured Vs Output Reading ........................................... 6

10. Temperature Output Calculations .......................................... 6

11. Calibration ................................................................................... 7

12. Calibration Procedure For HX93AC, HX93DA Series

Relative Humidity Adjustment ................................................ 7

13. Calibration Procedure For HX93AC, HX93DA Series

Temperature Adjustment ......................................................... 8

14. Calibration Procedure For HX93AV

Relative Humidity Adjustment ................................................ 9

15. Calibration Procedure For HX93AV

Temperature Adjustment ........................................................ 10

15A, Display Scaling For HX93DA Series ...................................... 11

16. Maintenance .............................................................................. 12

17. Specifications ............................................................................. 12

18. General Specifications .............................................................. 13

FIGURES

HX93A, HX93DA SERIES
RM/Temperature Transmitter

ii

Figure Page

Figure 1 Basic Transmitter Set-up

With Current Loop Output .............................................. 2

Figure 2 Wall Mount Model Dimensions ...................................... 3

Figure 3 Duct Mount And Remote Probe

Model Dimensions ............................................................ 3

Figure 4 Current Transmitter Wiring Example

(4 - 20 mA) .......................................................................... 4

Figure 5 Voltage Transmitter Wiring Example ............................ 5

Figure 6 HX93AC Calibration Procedure

Relative Humidity Adjustment ...................................... 7

Figure 7 HX93AC Calibration Procedure

Temperature Adjustment ................................................ 8

Figure 8 HX93AV Calibration Procedure

Relative Humidity Adjustment ...................................... 9

Figure 9 HX93AV Calibration Procedure

Temperature Adjustment .............................................. 10

Figure 10 Transmitter Lid Rear View ............................................ 11

1

HX93A, HX93DA SERIES

RH/Temperature Transmitter

1

1. General Description

The OMEGA®HX93A and HX93DA Series Relative Humidity/
Temperature Transmitter’s provide a linearized and temperature
compensated output signal of 4 to 20 mA or 0 to 1 Vdc depending upon
the model selected for both relative humidity and temperature
measurement. The output signals have been calibrated and scaled 0 to
100% for Relative Humidity and –20 to 75ºC for temperature. A thin film
polymer capacitor senses relative humidity while an 100 ohm RTD
measures temperature, both are protected by a stainless steel filter that is
easily removed for cleaning. The Nema rated polycarbonate enclosure and
cable entry connection provides weathertight protection. Screws are
provided for mounting via internal holes inside the enclosure. The
HX93DA Series has dual built-in indicators for humidity and temperature.

2. 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: [e-mail]

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.

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 HX93A transmitter.

• This Manual, # M0933A (1 ea.)

• #6 Wall Anchor and #6 Mounting Screw (2 ea.)

• Dewpoint Card (1 ea.)

Additional Transmitter Models Available

Model Description

HX92AC Wall mount RH transmitter (4 to 20 mA Output)

HX92AV Wall mount RH transmitter (0 to 1 Vdc Output)

HX92AC-D Duct mount RH transmitter (4 to 20 mA Output)

HX92AV-D Duct mount RH transmitter (0 to 1 Vdc Output)

continued on next page

NOTE

2

HX15AV-W Wall mount “High Ambient Temperature” application

RH/Temperature transmitter (dual 0 to 1 Vdc Output)

HX15AC-W Wall mount “High Ambient Temperature” application

RH/Temperature transmitter (dual 4 to 20 mA Output)

HX15AV-D Duct mount “High Ambient Temperature” application

RH/Temperature transmitter (dual 0 to 1 Vdc Output)

HX15AC-D Duct mount “High Ambient Temperature” application

RH/Temperature transmitter (dual 4 to 20 mA Output)

3. 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 HX93A
and the HX93DA Series the amount of current allowed to flow in the
loop will vary depending on the relative humidity or temperature being
measured by the sensor(s). 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 HX93A or HX93DA to function properly is found by
using the following formula:

For HX93A R

max

= (power supply voltage – 6 volts) ÷ .02 amps

EXAMPLE: (When using a 24 Vdc power supply).

R

max

= (24 – 6) ÷ .02 amps = 900 ohms max loop resistance

For HX93DA R

max

= (power supply voltage – 12 volts) ÷ .02 amps

EXAMPLE: (When using a 24 Vdc power supply).

R

max

= (24 – 12) ÷ .02 amps = 600 ohms max loop resistance

Figure 1 - Basic Transmitter Set-up With Current Loop Output

3

HX93A, HX93DA SERIES
RH/Temperature Transmitter

continued from page 1

23°C

–

+

TB2

TB1

DPi8 Panel Meter

–

+

24V

PSU-93

+

45%RH

DPi8 Panel Meter

–