Omega HX400 User guide

User’s Guide

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MADE IN TAIWAN

HX400 SERIES

Humidity/Temperature

Transmitter

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It is the policy of OMEGA Engineering, Inc. 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 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.

CONTENTS
1 Introduction

2. Electrical Installation

3. Configuration

3.1 Measuring Mode

3.2 Entering the Setup Mode

3.2.1 Select Ch #1 Parameters Output

3.2.2 Select Ch #2 Parameters Output

3.2.3 Set Ch #1 ZERO value

3.2.4 Set Ch #1 SPAN value

3.2.5 Set Ch #2 ZERO value

3.2.6 Set Ch #2 SPAN value

3.2.7 Set Ch #1 Upscale/ Downscale output

3.2.8 Set Ch #2 Upscale/ Downscale output

3.2.9 Set Ch #1 Lower Trip Point value

3.2.10 Set Ch #1HigherTrip Point value

3.2.11 Set Ch #2 Lower Trip Point value

3.2.12 Set Ch #2 Higher Trip Point value

3.2.13 Set Ch #1 & Ch #2 Hysteresis value

3.2.14 Set the Ch #1 Alarm Mode

3.2.15 Set the Ch #2 Alarm Mode

3.2.16 Set Temperature Units

3.2.17 Set Local Barometric Pressure

3.2.18 Set Ch #1 or Ch #2

4. Calibration

4.1 Calibration Equipment

4.2 Entering the Calibration Mode

4.2.1 Trim Ch #1 Loop Current 4.00 mA

4.2.2 Trim Ch #1 Loop Current 20.00 mA

4.2.3 Trim Ch #2 Loop Current 4.00 mA

4.2.4 Trim Ch #2 Loop Current 20.00 mA

4.2.5 Adjustment one-point Humidity

4.2.6 Adjustment one-point Temperature

4.2.7 Calibration 11.3 %RH Humidity

4.2.8 Calibration 57.5 %RH Humidity

4.2.9 Calibration 84.3 %RH Humidity

5. Maintenance

5.1 Sensor replaced

6. Error Code

7. Model description

2

1. Introduction

This manual contains information for the installation and operation of the HX400 Series

Humidity/Temperature Transmitter. The HX400 Series 2-wire loop-powered programmable

multi-units transmitter, is a versatile instrument which Converts, Indicates, Transmits and

Switches the input signal from an integrated digital polymer capacitive humidity sensor and a

PN barrier silicon temperature sensor into a linearized, temperature compensated, dual

single analog 4 - 20m ADC loop current output. See the unit block diagram <Fig. 1>

The HX400 Series is microprocessor based incorporating advanced electronic circuitry that

enables it to provide a high degree of performance and flexibility yet at a reasonable cost

and ease of use. The HX400 Series consists of a 3 push button front keyboard with dual color

3-digit 7-segments high bright LED modules. The display modules are used to indicate the

values of the measured parameters and computed values during Measuring Mode, and

provide prompting and programming instructions during Setup Mode and Calibration Mode.

See sensor operating condition <Fig 1-a>

The Setup Mode may be used by the user who wishes to re-configure the transmitter for

new applications. The Calibration Mode may be used by the user who wishes to maintain the

high performance of the unit. All of

EEPROM. If power to the transmitter is lost, the unit resumes normal operation with the

parameters that have been configured upon reapplication power. The Transmitter’s dual

independent analog output range can be set anywhere within the operating range.

The HX400 Series provides dual galvanic isolated solid state single pole relay output which

could be programmed as a high, low or window trips each with normally open or close

contacts for a variety of control applications.

Switch

Output RH% Max. Operating

100 Conditions

Humidity Loop Power

Sensor

Normal

Temp. Operating

Sensor

20

Push buttons

8 8 8

MCU

the working parameters and calibration data are saved on

Ch#1

V/I

Ch#2

V/I

-40 20 0 60 80 100 120

<Fig1> Block Diagram for HX402 Model <Fig 1-a> Sensor Operating Conditions

Ch #1 equipped only for HX401 Model

3

2. Electrical Wired & Installation

The power cord is one-meter length, 22 AWG, 7/6 different colors for recognition. Please

pay attention to polarity (Wire Colored) when connecting loop power source and external

Solid State Relay device. Warning: Model HX402 will be damaged if only Ch #1 is

powered

+Vloop (Red) +Vloop (Red)

-Vloop1 (Black; Ch #1 ) -Vloop1 (Black)

-Vloop2 (Brown; Ch #2) Power Supply

12 ~ 30 Vdc PS

mA mA mA

<Fig. 2a> HX402 power connection <Fig. 2b> HX401 power connection

External

HX401 10 ~ 24 Vdc

HX402

SW2+ (Blue) External SSR

SW2- (White) Power Relay AC load

SW1+ (Orange)

SW1- (Green)

<Fig.3> SW #1 & #2 Output Connection Diagram;

The built-in dual solid-state single pole switch output stress capacity is 40Vdc max. 15 mA

max. between terminal SW+ and terminal SW-

The Transmitter is designed for use in non-aggressive environments and indoor room use.

It is not recommended to use under condensation and water aerosol conditions. This use

could cause of water steam condensation on the sensor surface. If these conditions occur

it can cause sensor damage or dramatically increase response time for humidity change. .

#1 #2 #3 #4 Wire colored

#1: Green (Gn)

#2: Red (Rd)

<Fig 4 > Probe Connection #3: Brown (Bn)

#4: Black (Bk)

Connection Port on PCB location

4

Power Port

SW. Port

+Vloop

-Vloop1

SW2+

-Vloop2

SW2­ SW1+

SW1-

Probe Port

Gn Rd Bn Bk

<Fig 5> Internal Wire Connection

5

3. Configuring the HX400

The HX400 may be supplied factory configured for the working parameters as specified by the

customer at time of order. Use this manual in order to alter and modify the existing parameters

for new applications.

Keyboard Description:

ENT: ENTER key: Choose current display function or value as the correct and valid one. Also to

be used to enter into one of the programming states.

: UP key: Use to increase the numerical value of the display. Also to be used to scroll upwards

through the program menu during Measuring, Setup and Calibration Mode.

: DOWN key: Use to decrease the numerical value of the display. Also to be used to scroll

downwards through the program menu during Measuring, Setup and Calibration

Mode.

<Note>: Please do not press and release fast during operation the key, recommend at least

holding up 0.5 Sec when pressed.

The HX400 Setup and Calibration functions are configured through a two level of access push

button sequence. In order to use, the menu is divided into three main categories: Measuring,

Setup and Calibrate Mode. The HX400 enters Measuring Mode automatically after power on.

3.1 Measuring Mode

The Measuring Mode is the normal operating mode after power on. In Measuring Mode, using all

of the working parameters which were setup in Setup Mode, the outputs dual loop current

displays the measured values on the dual high bright 7-Segments LED modules, the meter will

do temperature drift compensation and real-time self-diagnostic checks. The sensor input circuit

is monitored for failure and the output current responds in a defined value

The HX400 is equipped with dual 4 ~ 20 mA current outputs and display modules, Channel #1

could be configured for Relative Humidity (RH), Absolutely Humidity (AH), Mixing Ratio (MR) or

Specific Enthalpy (SE) computed parameters displayed on upper display module (Green Color)

and Current Output, Channel #2 could be configured for Air Temperature (Ta), Dew Point

Temperature (Td)

or Wet Bulb Temperature (Tw) computed parameters displayed on lower

display module (Red Color) and Current Output. Two temperature engineering units Celsius,

Fahrenheit can be displayed with associated LED lamp in Ch # 2. Both Channels are

independent of operation. Also the meter can check Max/Min readings since powered on or the

last reset operation by press the ENTER key. When measured variable meets the alarm

conditions the built-in solid-state single pole relay will be energized or un-energized depending

on the Alarm Mode set and its associated LED lamp indication.

Note: Press UP/DOWN key browses computed parameters displayed only during the Measuring

Mode

6

. Display RH value

Display Ta value

Press UP key Press DOWN key

Display AH value

Display Td value

Press UP key Press DOWN key

Display MR value

Display Tw value

Press UP key
UP key Press DOWN key

Display SE value

< Channel #1> < Channel #2 >
<Fig. 6> Change displayed computed parameter only during Measuring Mode

Press ENTER key over 2 Sec.

Measuring Mode

Press UP & DOWN Press UP & ENTER
both key over 2 Sec. both key over 2 Sec.

Display Ch #1, #2

Max. Values

Press UP
.

Setup Mode

Calibration Mode

Display Ch #1, #2

Min. Values

Press DOWN & ENTER Press DOWN & ENTER
2 key simultaneously 2 key simultaneously Press
DOWN & ENTER
2 key simultaneously

Measuring Mode

<Fig. 7> Flow chart of Operating Mode

Max/Min Mode

Press DOWN key
over 2 Sec

Clear Ch #1, #2
Max/Min Values

RH: Relative Humidity
AH: Absolutely Humidity
MR: Mixing Ratio
SE: Specific Enthalpy
Ta: Air T emperature
Td: Dew Point Temperature
Tw: Wet Bulb Temperature

< Fig. 8 > Reset Ch #1, #2 Max/Min values

7

3.2 Entering the Setup Mode

To start the Setup Mode, first press and hold the UP key and DOWN key simultaneously until the
setting prompt is displayed during Measuring Mode see< Fig 7>. The Setup Mode will allow the
user to do the following:
Change Ch #1 & Ch #2 computed parameter for Transmitting and Alarm operation.
Change Ch #1 & Ch #2 the 4mA Lower Range Value.
Change Ch #1 & Ch #2 the 20mA Full Scale Value.
Change Ch #1 & Ch #2 the Sensor Fail Safe detection. (Upscale/Downscale output)
Change Ch #1 & Ch #2 Lower / Higher Trip Point Value.
Change Ch #1 & Ch #2 Dead Band (Hysteresis) of Trip Point Value
Change SW #1 & SW #2 Alarm Operation Mode
Change Temperature Engineering Units and Local Barometric Pressure offset
Change Ch #1 or Ch #2 Active Output
Each of these functions prompts are presented in sequence on the upper LED display module.
Use the UP key or DOWN key to scroll the Setup Mode menu. To perform the displayed function
press the ENTER key, the transmitter will response by displaying the existing status or working
parameter on the lower LED display module. Press the UP key or DOWN key to increase or
decrease the displayed value that you want to configure. Finally press ENTER key again to save
the edited parameter into Non-Volatile Memory and display the next function prompt. These are
described in detail below and summarized on the Keyboard Flow Chart see< Fig. 9 >.
Displayed Prompt Functions ( Factory Set)

5-1
5-2
5-3
5-4
5-5
5-6
5-7
5-8
5-9
510
511

Set the Ch #1 computed parameter ( RH )

Set the Ch #2 computed parameter ( Ta )
Set the Ch #1 4mA Value (ZERO) ( 10 %RH)
Set the Ch #1 20mA Value (SPAN) ( 90 %RH)
Set the Ch #2 4mA Value (ZERO) (0 ℃)
Set the Ch #2 20mA Value (SPAN) (60 ℃)
Set the Ch #1 Upscale / Downscale output ( Downscale )
Set the Ch #2 Upscale / Downscale output (Downscale)
Set the Ch #1 Lower Trip Point Value ( 20 % RH)
Set the Ch #1 Higher Trip Point Value ( 60 % RH)
Set the Ch #2 Lower Trip Point Value ( 5 ℃)

512
513
514
515
516
517

Set the Ch #2 Higher Trip Point Value (50 ℃)
Set the Ch #1 & Ch #2 Dead Band of Trip Point (1% RH & 1℃ )

Set the Ch #1 Alarm Mode ( Disable )
Set the Ch #2 Alarm Mode ( Disable)
Set the Temperature Engineering Unit (℃ /℉ ) ( ℃ )
Set the local Barometric Pressure offset value ( 0 Kp )

8

S18

Table 1 Setup Mode

Set Ch #1 or Ch #2 Active Output (only HX402 Model)

9

A

Prompt

ENTER

Ch. #1 Parameters

UP, DOWN key to edit 5-1

UP/DOWN ENTER

ENTER

5-2

Ch. #2 Parameters

UP, DOWN key to edit

UP/DOWN ENTER

ENTER

5-3

Ch #1 LRV

UP, DOWN key to edit

UP/DOWN ENTER

ENTER

5-4

Ch #1 HRV

UP, DOWN key to edit

UP/DOWN ENTER

ENTER

5-5

Ch #2 LRV

UP, DOWN key to edit

UP/DOWN ENTER

ENTER

5-6

Ch #2 HRV

UP, DOWN key to edit

UP/DOWN ENTER

ENTER

5-7

Ch #1 Up/Down

UP, DOWN key to edit

UP/DOWN ENTER

ENTER

5-8

Ch #2 Up/Down UP, DOWN key to edit

UP/DOWN ENTER

ENTER

Ch # 1 LTP UP, DOWN key to edit 5-9

UP/DOWN ENTER
Continue.

10

A

Prompt Continue.
ENTER

510

Ch #1 HTP

UP, DOWN key to edit

UP/DOWN ENTER

ENTER

511

Ch #2 LTP

UP, DOWN key to edit

UP/DOWN ENTER

ENTER

512

Ch #2 HTP UP, DOWN key to edit

UP/DOWN ENTER

ENTER

513

Ch #1, 2 Dead Band

UP, DOWN key to edit

UP/DOWN ENTER

ENTER

514

Ch #1 Alarm Mode

UP, DOWN key to edit

UP/DOWN ENTER

ENTER

515

Ch #2 Alarm Mode

UP, DOWN key to edit

UP/DOWN ENTER

ENTER

516

Temperature Units

UP, DOWN key to edit

UP/DOWN ENTER

ENTER

517

Local Baro Pressure

UP, DOWN key to edit

UP/DOWN ENTER

ENTER

518

Ch #1 / Ch #2 Output UP, DOWN key to edit

<Fig 9 > Flow Chart of Setup Mode

11

3.2.1 Select Ch # 1 Computed Parameter function < 5-1 >

Select Ch#1 is the first function in the sequence. The Relative Humidity (RH), Absolute Humidity
(AH), Mixing Ratio (MR) or Specific Enthalpy (SE) can be selected for Transmitting, Displaying
and Alarm functions. The display prompt 5-1 is displayed on the upper LED module. Press the
ENTER key, the transmitter will respond by displaying the existing Computed Parameter Code
displayed on the lower LED module. Use the UP key or DOWN key select the Code until the
code is set correctly. Press the ENTER key again to save and quit the function. Default Code is 0.
Note: when pressing keypads please hold until the displayed status has changed,

Computed Parameter Code Measuring Range Min Span
Relative Humidity (RH) 0 1 ~ 99 % 10 %
Absolutely Humidity (AH) 1 0 ~ 600 g/M

3

60 g/M

3

Mixing Ratio (MR) 2 0 ~ 600 g/Kg 60 g/Kg

Specific Enthalpy (SE) 3 0 ~ 999 kj/Kg 100 kj/Kg

Table 2 Ch #1 Computed Parameter Code and Measuring Range

3.2.2 Select Ch # 2 Computed Parameter function < 5-2 >

The Air Temperature (Ta), Dew Point Temperature (Td) or Wet Bulb Temperature (Tw) can be
selected for Transmitting, Displaying and Alarm. The display prompt 5-2 is displayed on the
upper LED module. Press the ENTER key, the transmitter will respond by displaying the existing
Computed Parameter Code displayed on the lower LED module. Use the UP key or DOWN key
select the Code until the code is set correctly. Press the ENTER key again to save and quit the
function. Default Code is 4. Note: when pressing keypads please hold until the displayed status
has changed,

Computed Parameter Code

Measuring Range (℃) Min Span (℃)

Air Temperature (Ta) 4 - 30 ~ 100 10
Dew Point Temperature (Td) 5 - 40 ~ 60 10

Wet Bulb Temperature (Tw) 6 - 40 ~ 60 10

Table 3 Ch #2 Computed Parameter Code and Measuring Range

3.2.3 Set Ch#1 Lower Range Value @ 4mA ( ZERO) function < 5-3>

The function display prompt is S-3 displayed on the upper LED module. Press the ENTER key,
the transmitter will respond by displaying the existing ZERO value on the lower LED module. Use
the UP key or DOWN key to increase /decrease the displayed value until the value is set
correctly. Press the ENTER key again to save and quit the function. The adjustable ZERO range
is from 0 to SPAN-10

12

3.2.4 Set Ch #1 Higher Range Value @ 20 mA (SPAN) function < 5-4 >
The function display prompt is S-4 displayed on the upper LED module. Press the ENTER key,
the transmitter will response by displaying the existing SPAN value on the lower LED module.
Use the UP key or DOWN key to increase /decrease the value until the value is set correctly.
Press the ENTER key again to save and quit the function. The adjustable SPAN range is from
ZERO+10 to Maximum measuring range

3.2.5 Set Ch #2 Lower Range Value @ 4mA ( ZERO) function < 5-5>

The function display prompt is S-5 displayed on the upper LED module. Press the ENTER key,
the transmitter will response by displaying the existing ZERO value on the lower LED module.
Use the UP key or DOWN key to increase /decrease the displayed value until the value is set
correctly. Press the ENTER key again to save and quit the function. The adjustable ZERO range
is from 0 to SPAN-10

3.2.6 Set Ch #2 Higher Range Value @20 mA (SPAN) function < 5-6 >
The function display prompt is S-6 displayed on the upper LED module. Press the ENTER key,
the transmitter will response by displaying the existing SPAN value on the lower LED module.
Use the UP key or DOWN key to increase /decrease the value until the value is set correctly,
Press the ENTER key again to save and quit the function. The adjustable SPAN range from
ZERO+10 to Maximum measuring range

3.2.7 Set Ch#1 Fail Safe Reporting function < 5-7 >

Fail-safe reporting allows the transmitter to change the 4-20mA loop to indicate a failure
condition. This failure may be a sensor failure or a transmitter failure. The function display
prompt is S-7 displayed on the upper LED module. Press the ENTER key, the transmitter will
response by displaying the existing Code on the lower LED module. Use the UP key or DOWN
key to increase /decrease the Code until the value is set correctly . Press the ENTER key again to
save and quit the function. Code=0 means loop current less than 3.8 mA (Downscale). Code=1
means loop current above 21 mA (Upscale). Default Code is 0

Fail-safe reporting Code

Downscale 0
Upscale 1
Table 6 Ch #1 & Ch #2 Fail Safe Reporting

3.2.8 Set Ch#2 Fail Safe Reporting function < 5-8 >

Fail-safe reporting allows the transmitter to change the 4-20mA loop to indicate a failure
condition. This failure may be a sensor failure or a transmitter failure. The function display
prompt is S-8 displayed on the upper LED module. Press the ENTER key, the transmitter will
response by displaying the existing Code on the lower LED module. Use the UP key or DOWN

13

key to increase /decrease the Code until the value is set correctly . Press the ENTER key again to
save and quit the function. Code=0 means loop current less than 3.8 mA (Downscale). Code=1
means loop current above 21 mA (Upscale). Default Code is 0

3.2.9 Set Ch#1 Lower Trip Point Value (LTP) function < 5-9 >

The function display prompt is S-9 displayed on the upper LED module. Press the ENTER key,
the transmitter will respond by displaying the existing Lower Trip Point value on the lower LED
module. Use the UP key or DOWN key to increase /decrease the value until the value is set
correctly. Press the ENTER key again to save and quit the function. The Lower Trip Point Value
must be greater than ZERO.

3.2.10 Set Ch#1 Higher Trip Point Value (HTP) function < 510 >

The function display prompt is S10 displayed on the upper LED module. Press the ENTER key,
the transmitter will response by displaying the existing Higher Trip Point value on the lower LED
module. Use the UP key or DOWN key to increase /decrease the value until the value is set
correctly. Press the ENTER key again to save and quit the function. The Higher Trip Point Value
must be less than SPAN.

3.2.11 Set Ch#2 Lower Trip Point Value (LTP) function < 511 >

The function display prompt is S11 displayed on the upper LED module. Press the ENTER key,
the transmitter will respond by displaying the existing Lower Trip Point value on the lower LED
module. Use the UP key or DOWN key to increase /decrease the value until the value is set
correctly. Press the ENTER key again to save and quit the function. The Lower Trip Point Value
must be greater than ZERO.

3.2.12 Set Ch#2 Higher Trip Point Value (HTP) function < 512 >

The function display prompt is S12 displayed on the upper LED module. Press the ENTER key,
the transmitter will response by displaying the existing Higher Trip Point value on the lower LED
module. Use the UP key or DOWN key to increase /decrease the value until the value is set
correctly. Press the ENTER key again to save and quit the function. The Higher Trip Point Value
must be less than SPAN.

Note: The relationship of ZERO ≦ LTP < HTP ≦ SPAN must be followed

3.2.13 Set Ch #1 & Ch #2 Dead Band (Hysteresis) of Trip Point function < 513 >

The function display prompt is S13 displayed on the upper LED module. Press the ENTER key,
the transmitter will respond by displaying the existing Dead Band value on the lower LED module.
Use the UP key or DOWN key to increase /decrease the value until the value is set correctly.
Press the ENTER key again to save and quit the function. Default value is 1

WARNING: The alarm should not be used for critical safety applications such as an
emergency shut down system.

14

3.2.14 Set Ch #1 Alarm Mode function < 514 >
The function display prompt is S14 displayed on the upper LED module. Press the ENTER key,
the transmitter will respond by displaying the existing Alarm Mode Code on the lower LED
module. Use the UP key or DOWN key to increase /decrease the code until the code is set
correctly. Press the ENTER key again to save and quit the function. Default Code is 0.

Alarm Mode Code

Disable 0
Mode 1 1
Mode 2 2
Mode 3 3
Mode 4 4
Table 7 Ch #1 Alarm code

15

3.2.15 Set Ch #2 Alarm Mode function < 515 >
The function display prompt is S15 displayed on the upper LED module. Press the ENTER key,
the transmitter will respond by displaying the existing Alarm Mode Code on the lower LED
module LED. Use the UP key or DOWN key to increase /decrease the code until the code is set
correctly. Press the ENTER key again to save and quit the function. Default Code is 0.

Alarm Mode Code
Disable 0
Mode 1 1
Mode 2 2
Mode 3 3
Mode 4 4
Table 7 Ch #2 Alarm code

1. Mode 1: PV > Low Trip Point; Alarm tripped, SSR change position from Open to Close

2. Mode 2: PV < Low Trip Point; Alarm tripped, SSR change position from Close to Open

Switch Close Switch Close

Dead Band Dead Band

Switch Open Switch Open

LTP PV LTP PV

<Fig. 10-a > MODE 1 < Fig. 10-b > MODE 2

3. Mode 3: LTP < PV <HTP; Alarm tripped, SSR change Position from Open to Close

4. Mode 4: LTP < PV <HTP; Alarm tripped, SSR change Position from Close to Open

SW. Close SW Close

SW. Open SW. Open

LTP HTP PV LTP HTP PV
<Fig. 10-c> MODE= 3 < Fig. 10-d> MODE= 4
< Fig 10> Alarm Modes
Note: PV= Process Value. LTP= Lower Trip Point, HTP= Higher Trip Point

16

3.2.16 Set Temperature Engineering units function < 516 >
The function display prompt is S16 displayed on the upper LED module. Press the ENTER key,
the transmitter will respond by displaying the existing temperature engineering units code on the
lower LED module. Use the UP key or DOWN key to increase /decrease the code until the code
is set correctly. Press the ENTER key again to save and quit the function. Default code is 0
Temperature Engineering units Code

Celsius, 0
Fahrenheit 1

3.2.17 Set Local Barometric Pressure Function <517>

Barometric Pressure is required for computation of Tw, MR and SE input parameters. The
function display prompt is S17 displayed on the upper LED module. Press the ENTER key, the
transmitter will respond by displaying the existing offset value from default on the lower LED
module. Use the UP key or DOWN key to increase /decrease the offset value until the value is
set correctly. Press the ENTER key again to save and quit the function. The default Barometric
Pressure is 101.3 kP. Adjustable range: +/- 99 kP

3.2.18 Set Ch #1 or Ch #2 as a active output Function <518>

This function is used only for single loop current HX401 model. The function display prompt is
S18 displayed on the upper LED module. Press the ENTER key, the transmitter will respond by
displaying the existing code value on the lower LED module. Use the UP key or DOWN key to
increase /decrease the code until the code is set correctly. Press the ENTER key again to save
and quit the function. The default code is 1
Active output Code

Ch #1 1
Ch #2 2

17

4. Calibrate the Transmitter

Do not start any calibration procedure without first reading and fully understanding this manual.
Improper operation may cause the loss of calibration data. The Transmitter and Calibration
Equipments need warm-up (5 minutes) before getting high performance.

4.1 Calibration Equipment:

Standard Humidity Buffer/ Chamber or Humidity Generator (Salt Solutions)
51/2 Multi-meter; Monitor output current from transmitter
Power Supply: 24 Vdc nominal

4.2 Entering the Calibration Mode

To start the Calibration Mode, first press and hold the UP key and ENTER key simultaneously
until the Calibration Mode prompt is displayed during Measuring Mode see
< Fig.7 >. The Calibration Mode will allow the user to do the following operation. See <Fig 11>
Setting Ch # 1 & Ch # 2 ZERO point 4 mA
Setting Ch # 1 & Ch # 2 SPAN point 20 mA
Field Alignment one-point Humidity Offset
Field Alignment one-point Temperature Offset
Calibration 3 points Humidity

Displayed Prompt Functions
C1L Trim Ch #1 4.00 mA
C1H Trim Ch #1 20.00 mA
C2L Trim Ch #2 4.00 mA
C2H Trim Ch #2 20.00 mA
C-3 Alignment one-point Humidity Offset
C-4 Alignment one-point Temperature Offset

C5L Calibration 11.3% RH Humidity

C5F Calibration 57.5% RH Humidity
C5H Calibration 84.5% RH Humidity
Table 8 Calibration Mode

18

B

Prompt

ENTER

C1L

Trim Ch #1 4.00 mA

LED Displayed 4.00

UP/DOWN ENTER

ENTER

C1H

Trim Ch#1 20.00 mA

LED Displayed 20.0

ENTER
UP/DOWN

ENTER

C2L

Trim Ch #2 4.00 mA

LED Displayed 4.00

UP/DOWN ENTER

ENTER

C2H

Trim Ch #2 20.00 mA

LED Displayed 20.0

ENTER
UP/DOWN

ENTER

C-3

Adj. Humidity Offset

LED Displayed Offset

UP/DOWN ENTER

ENTER

C-4

Adj. Temp. Offset

LED Displayed Offset

UP/DOWN ENTER

ENTER

C5L

Cal. 11.3 % RH LED Displayed RH

UP/DOWN ENTER

ENTER

Cal. 57.5 % & 84.5% RH LED Displayed RH2% C5F

UP/DOWN ENTER

<Fig. 11 > Flow Chart of Calibration Mode

19

4.2.1 Trim Ch #1 4.00 mA

The function display prompt is C1L displayed on the upper LED module. Press the ENTER key,
the transmitter will respond by displaying 4.00 on the lower LED module and will output a
milliamp current equal to its internal set 4mA. This 4 mA value should be read on an external
Multi-meter. Use the UP key or DOWN key to increase /decrease the output current until the

4.00mA current is read correctly. Press the ENTER key again to save and quit the function. It is
advisable to use a higher accuracy Multi-meter to read the output current. It is very possible that
the transmitter will be more accurate than a great many Multi-meters. In this case, trimming will
make the transmitter less accurate rather than more accurate

4.2.2 Trim Ch #1 20.00 mA

The function display prompt is C1H displayed on the upper LED module. Press the ENTER key,
the transmitter will respond by displaying 20.0 on the lower LED module and will output a
milliamp current equal to its internal set 20mA. This 20 mA value should be read on an external
Multi-meter. Use the UP key or DOWN key to increase /decrease the current until 20.00mA
current is read correctly. Press the ENTER key again to save and quit the function.

Note: These functions are only for the purpose of adjusting the loop current to be exactly

4.00/20.00 mA according to the plant’s local standard. This is not to re-range the
transmitter

4.2.3 Trim Ch #2 4.00 mA

The function display prompt is C2L displayed on the upper LED module. Press the ENTER key,
the transmitter will respond by displaying 4.00 on the lower LED module and will output a
milliamp current equal to its internal set 4mA. This 4 mA value should be read on an external
Multi-meter . Use the UP key or DOWN key to increase /decrease the output current until 4.00mA
current is read correctly. Press the ENTER key again to save and quit the function. It is advisable
to use a higher accuracy Multi-meter to read the output current. It is very possible that the
transmitter will be more accurate than a great many Multi-meters. In this case, trimming will
make the transmitter less accurate rather than more accurate

4.2.4 Trim Ch #2 20.00 mA

The function display prompt is C2H displayed on the upper LED module. Press the ENTER key,
the transmitter will respond by displaying 20.0 on the lower LED module also output a milliamp
current equal to its internal set 20mA. This 20 mA value should be read on an external
Multi-meter. Use the UP key or DOWN key to increase /decrease the current until 20.00mA
current is read correctly, press ENTER key again to save and quit the function.

Note: These functions are only for the purpose of adjusting the loop current to be exactly

4.00/20.00 mA according to the plant’s local standard. This is not to re-range the
transmitter

20

4.2.5 Alignment one point Humidity (Humidity Offset)

The function display prompt is C-3 displayed on the upper LED module. Press the ENTER key,
the transmitter will respond by displaying the measured value on the upper LED module and will
display the offset value on the lower LED module. Press the UP/DOWN key to change the
measured value and offset value of the measured value until the measured value match as the
standard value. Press the ENTER key again to execute and quit the function Note: Replace or

re-calibrate the Humidity sensor if the humidity offset value is larger than +/- 3 % RH or
more.

4.2.6 Alignment one point Temperature (Temperature Offset)

The function display prompt is C-4 displayed on the upper LED module. Press the ENTER key,
the transmitter will respond by displaying the measured value on the upper LED module and will
display the offset value on the lower LED module. Press the UP/DOWN key to change the
measured value and offset value of the measured value until the measured value match as the
standard value. Press the ENTER key again to execute and quit the function Note: The

temperature sensor has to be replaced if the temperature offset value is larger than +/- 1
℃ or more.

4.2.7 Calibration 11.3 % RH

Place the probe into a humidity chamber or salt solutions of 11.3 % RH and wait until it settles
into equilibrium. The function display prompt is C5L displayed on the upper LED module. Press
the ENTER key, the transmitter will respond by displaying a default of 11.3 or the existing value
(last calibrated) on the lower LED module. Press the UP/DOWN key to change to the matching
chamber presented. Press the ENTER key again to execute and quit the function. The
calibration data will be displayed a short time and saved to EEPROM. Note: An error will be
displayed on the upper LED module if the calibration point is out of 10 ~12 %RH range. It is
recommended to repeat this function several times to insure the probe is in equilibration.

4.2.8 Calibration 57.5 % RH

Place the probe into a humidity chamber or salt solutions of 57.5 % RH and wait until it settles
into equilibrium. The function display prompt is C5F displayed on the upper LED module. Press
the ENTER key, the transmitter will response by displaying a default of 57.5 or existing value
(last calibrated) on lower LED module, press UP/DOWN key to change to the matching chamber
presented. Press the ENTER key again to execute and quit the function. The calibration data will
be displayed a short time and saved to EEPROM. Note: An error will be displayed on the upper
LED module if calibration point out of 56~ 60 %RH range. It is recommended to repeat this
function several times to insure the probe is in equilibration

4.2.9 Calibration 84.3 % RH

Place the probe into a humidity chamber or salt solutions of 84.3 % RH and wait until it settles

21

into equilibrium. The function display prompt is C5H displayed on the upper LED module. Press

the ENTER key, the transmitter will respond by displaying a default of 84.3 or existed value (last

calibrated) on the lower LED module. Press the UP/DOWN key to change to the matching

chamber presented. Press the ENTER key again to execute and quit the function. The

calibration data will be displayed a short time and saved to EEPROM. Note: An error displayed

on the upper LED module if calibration point out of 82~ 86 %RH range.

It is recommended to repeat this function several times to insure the probe is in equilibration

5. Application and Maintenance

Please avoid any high concentration of volatile & aggressive chemical solvent vapors or other

organic compounds or Acids and bases such as Ketenes, Acetone, Ethanol, Isopropyl Alcohol,

Toluene, HCL, H2SO4, HNO3, NH3, H2O2,Ozone etc or exposure to extreme high humidity and

temperature conditions for extended time periods (may offset the sensor output). If these

happens, the following conditioning procedure may bring the sensor back to calibration state.
Baking: 100 ~ 105

at less 5% RH for 10 hours.

Re-Hydration: 20 ~ 30 at > 75% RH for 12 hours

5.1 Sensor replacement

Power-off the unit. Open the HX400,loosen the sensor input wires as picture represent. Remove

the Cap from probe by counterclockwise turns (recommend pliers to hold the limpid area of the

probe). Loosen & remove the sensor PCB from Tube.

22

6. Error Code

When the sensor input wires are broken, or beyond acceptable range or the internal components

fail the instrument will display error symptoms for revealing the cause of the fault.

Err3: Humidity/Temperature sensor input wires are broken or the input signal is beyond the

acceptable range. Check input wires

Err4 ~8: Internal Calibration data failure. Need to re-calibrate again or Return to Omega

Engineering for repair

7. Model

HX401W Single Loop; Wall mounted

Probe length 80 mm

HX401R Single Loop; Remote type

Wire length 100 cm

HX401D Single Loop; Duct mounted

Probe length 230 mm

HX402W Dual Loop; Wall mounted

Probe length 80 mm

HX402R Dual Loop; Remote type

Wire length 100 cm

HX402D Dual Loop; Duct mounted

Probe length 230 mm

23

WARRANTY/DISCLAIMER

OMEGA ENGINEERING, INC. warrants this unit to be free of defects in materials and workmanship for a
period of 13 months from date of purchase. OMEGA’s WARRANTY adds an additional one (1) month
grace period to the normal one (1) year product warranty to cover handling and shipping time. This
ensures that OMEGA’s customers receive maximum coverage on each product.

If the unit malfunctions, it must be returned to the factory for evaluation. OMEGA’s Customer Service
Department will issue an Authorized Return (AR) number immediately upon phone or written request.
Upon examination by OMEGA, if the unit is found to be defective, it will be repaired or replaced at no
charge. OMEGA’s WARRANTY does not apply to defects resulting from any action of the purchaser,
including but not limited to mishandling, improper interfacing, operation outside of design limits,
improper repair, or unauthorized modification. This WARRANTY is VOID if the unit shows evidence of
having been tampered with or shows evidence of having been damaged as a result of excessive corrosion;
or current, heat, moisture or vibration; improper specification; misapplication; misuse or other operating
conditions outside of OMEGA’s control. Components in which wear is not warranted, include but are not
limited to contact points, fuses, and triacs.

OMEGA is pleased to offer suggestions on the use of its various products. However,
OMEGA neither assumes responsibility for any omissions or errors nor assumes liability for any
damages that result from the use of its products in accordance with information provided by
OMEGA, either verbal or written. OMEGA warrants only that the parts manufactured by it will be
as sp ecified and f ree of defects. OMEGA M AKES N O OT HER WARRANT IES OR
REPRESENTATIONS OF ANY KIND WHATSOEVER, EXPRESS OR IMPLIED, EXCEPT THAT OF TITLE,
AND ALL IMPLIED WARRANTIES INCLUDING ANY WARRANTY OF MERCHANTABILITY AND
FI TNESS FOR A PARTICULAR PURP OSE ARE HEREBY DISCLAIMED. L IMITATION OF
LIABILITY: The remedies of purchaser set forth herein are exclusive, and the total liability of
OMEGA with respect to this order, whether based on contract, warranty, negligence,
indemnification, strict liability or otherwise, shall not exceed the purchase price of the
co mponent upon w hich l iability is based. I n no event shall OMEGA be li able f or
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; or (2) in medical
applications or used on humans. Should any Product(s) be used in or with any nuclear installation or
activity, medical application, used on humans, or misused in any way, OMEGA assumes no responsibility
as set forth in our basic WARRANTY/ DISCLAIMER language, and, additionally, purchaser will indemnify
OMEGA and hold OMEGA harmless from any liability or damage whatsoever arising out of the use of the
Product(s) in such a manner.

RETURN REQUESTS/INQUIRIES

Direct all warranty and repair requests/inquiries to the OMEGA Customer Service Department. BEFORE
RETURNING ANY PRODUCT(S) TO OMEGA, PURCHASER MUST OBTAIN AN AUTHORIZED RETURN
(AR) NUMB E R FR O M OME GA’S CU STOM E R SE RV I CE DE PARTMEN T (IN ORDE R TO AV OID
PROCESSING DELAYS). The assigned AR number should then be marked on the outside of the return
package and on any correspondence.

The purchaser is responsible for shipping charges, freight, insurance and proper packaging to prevent
breakage in transit.

FOR WARRANTY
following information available BEFORE
contacting OMEGA:

1. Purchase Order number under which the product
was PURCHASED,

2. Model and serial number of the product under
warranty, and

3. Repair instructions and/or specific problems
relative to the product.

OMEGA’s policy is to make running changes, not model changes, whenever an improvement is possible. This affords
our customers the latest in technology and engineering.

OMEGA is a registered trademark of OMEGA ENGINEERING, INC.
© Copyright 2012 OMEGA ENGINEERING, INC. All rights reserved. This document may not be copied, photocopied,

reproduced, translated, or reduced to any electronic medium or machine-readable form, in whole or in part, without the
prior written consent of OMEGA ENGINEERING, INC.

RETURNS, please have the

FOR NON-WARRANTY REPAIRS,
for current repair charges. Have the following
information available BEFORE contacting OMEGA:

1. Purchase Order number to cover the COST
of the repair,

2. Model and serial number of the product, and

3. Repair instructions and/or specific problems
relative to the product.

consult OMEGA

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Process Measurement and Control?

OMEGA…Of Course!

Shop online at omega.com

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