MBW 473-RP2 User manual

Operation and
Maintenance Manual
V5.0
Dew Point Mirror 473

MBW 473 Manual English V5.0 i
Warranty
MBW Calibration AG. (MBW) guarantees that its products are manufactured to the highest quality of
material and workmanship specifications. MBW guarantees the reliability of its products for a period of
24 months from the date of initial shipment when operated in normal use and within the specified de-
sign limitations. Under this Warranty, MBW will, at its discretion, repair or replace any component that
upon examination by MBW or its duly authorized representatives proves to be defective during the
warranty period provided the system is returned to the factory for inspection and repair shipping pre-
paid. Improper or unauthorized maintenance, storage, repair, or alteration of any kind by personnel
other than MBW or its duly authorized representatives may void all warranties. Warranty may also be
voided for misuse, neglect, accident, corrosion, and improper installation. This Warranty is exclusive
and in lieu of any and all other warranties of merchantability, fitness for a particular purpose, or any
other warranty, expressed or implied, and all other liabilities and obligations on the part of MBW. MBW
will not be liable for any other claims or damages, either direct, indirect, or consequential arising out of
the use of its products.
Original manuals are supplied in English and German. Translations in other languages are available,
but in the event of any discrepancy, the German or English versions will be considered as the official
version.
Subject to change without notice.
For the latest version of this manual please visit our website.
Copyright © 2018
2018-04-30
MBW Calibration AG
Seminarstrasse 55/57
CH-5430 Wettingen / Switzerland
[phone] phone
[phone] fax
[e-mail]
www.mbw.ch

ii MBW 473 Manual English V5.0

MBW 473 Manual English V5.0 iii
Table of Contents
WARRANTY .....................................................................................................I
TABLE OF CONTENTS ..................................................................................III
1SAFETY INSTRUCTIONS ...........................................................................1
2KEY FEATURES ........................................................................................3
3QUICK START ...........................................................................................5
3.1 Unpacking.......................................................................................................................................5
3.2 Installing the Measuring Heads......................................................................................................6
3.3 Starting your 473............................................................................................................................7
3.4 Dew Point Measurement................................................................................................................7
4GET TO KNOW YOUR 473 .........................................................................9
4.1 Front Panel.....................................................................................................................................9
4.2 Touch Screen .............................................................................................................................. 12
4.3 Back Panel .................................................................................................................................. 13
4.4 Measuring Heads ........................................................................................................................ 18
4.5 Carrying Handle........................................................................................................................... 23
5SYSTEM CONFIGURATION ..................................................................... 25
5.1 The Menu .................................................................................................................................... 25
5.2 Selection of indicated Parameters............................................................................................... 26
5.3 Selection of Numeric or Graphic Data Display............................................................................ 27
5.4 Control Setup............................................................................................................................... 30
5.5 Selection of Units......................................................................................................................... 35
5.6 Selection of Color........................................................................................................................ 36
5.7 Configuration of Optional Analog Outputs................................................................................... 37
5.8 Diagnostic Functions................................................................................................................... 39
6SET UP AND OPERATION ....................................................................... 43
6.1 Measurement Set Up................................................................................................................... 43
6.2 External Temperature.................................................................................................................. 44
6.3 Application Integration................................................................................................................. 45

iv MBW 473 Manual English V5.0
7REMOTE COMMUNICATION ....................................................................49
7.1 Hardware Connection and Cabling..............................................................................................49
7.2 Communication Settings..............................................................................................................50
7.3 Command Syntax ........................................................................................................................50
7.4 Command Reference...................................................................................................................52
8MAINTENANCE ........................................................................................55
8.1 Calibrate the Touch Screen.........................................................................................................55
8.2 Mirror Cleaning ............................................................................................................................56
8.3 Exterior Cleaning .........................................................................................................................57
8.4 Peltier Cooling Test .....................................................................................................................58
8.5 Periodic Maintenance Checks.....................................................................................................58
9ERROR MESSAGES.................................................................................59
9.1 Reversible Error Messages .........................................................................................................59
9.2 Irreversible Error Messages.........................................................................................................59
9.3 Fan failure SHX ...........................................................................................................................60
10 SPECIFICATIONS .................................................................................61
11 DRAWINGS...........................................................................................63
11.1 Display Unit..................................................................................................................................63
11.2 Measuring Heads.........................................................................................................................65
12 FAQ’S ...................................................................................................69

MBW 473 Manual English V5.0 1
1 Safety Instructions
•Disconnect power supply before opening
the instrument housing or connecting / disconnecting
sensors.
•Measuring head may get hot during operation.
Instruments built for the SH3 measuring head
supply more power through the measuring head
cable. Therefore you must not connect an SH2
or RP2 measuring head to these display units,
as it will damage the measuring heads.

2 MBW 473 Manual English V5.0

MBW 473 Manual English V5.0 3
2 Key Features
Precise and Stable Humidity Measurement
With the 473 Dew Point Mirror you are able to perform precise dew point measurements as well as
measurements of other parameters such as relative humidity. The humidity measurement of the 473 is
based on chilled mirror condensation technology which provides highly precise, stable and repeatable
results.
Remote Measuring Heads with Temperature Probe
The 473 features remote cable mounted measuring head options, the RP2, SH2, SH3 and SHX. They
are designed for direct placement into applications. Measuring heads are available with a PRT for
precise temperature measurement and for the calculation of relative humidity.
Optional Pressure Measurement
Optionally, the 473 can be ordered with internal pressure measurement capability. This enables the
user to measure barometric pressure or pressure at the point of measurement.
LCD Display with Touch Panel
The 473 has a full color LCD touch panel with a high contrast ratio and a wide viewing angle for easy
readability. Data is displayed in large, easy-to-read fonts. Using the on-screen buttons and menus,
you can easily configure each line of the display for a variety of humidity, temperature, and pressure
parameters that may be viewed in either SI or non-SI units.
Calibration Check Function
Users can check the 473 calibration at any time using the built-in Ice Test function, which provides
instant verification of system accuracy and integrity.
Connect and Go
The system is ready for immediate use.

4 MBW 473 Manual English V5.0

MBW 473 Manual English V5.0 5
3 Quick Start
This section guides you through the set-up and the first steps using your 473. It is a summary and
should be used as a general overview and reference only. Do not use it as a substitute for the remain-
der of the manual. To understand your instrument thoroughly, please read the other sections carefully.
3.1 Unpacking
The 473-RP2, SH2 and SHX are delivered in a custom-fit foam-lined Peli 1550 transport case. The
473-SH3 is supplied in a cardboard carton and does not include the external PRT as standard.
The following items are included in the case:
•473 Display Unit
•RP2, SH2, SH3 or SHX measuring head (as ordered)
•Temperature probe. Platinum Resistance Thermometer
1
(PRT)
oThe RP2 is supplied with a Ø3 x 30 mm PRT and a 0.5 m cable for extended connection
between the probe and the measuring head and a 3 m cable to connect the probe direct-
ly to the back panel of the instrument.
oThe SH2 is supplied with a Ø2 x 100 mm PRT and a 0.5 m cable to connect the probe to
the measuring head and a 3 m cable to connect the probe directly to the back panel of
the instrument.
oThe SHX is supplied with a Ø3 x 30 mm PRT and a 1 m cable for extended connection
between the probe and the measuring head.
oThe SH3 does not include a PRT as standard.
•AC power cord
•External power supply (Input: 100-240 V AC, Output: 24 V DC)
•2 m measuring head cable
•Operation and maintenance manual
•Calibration certificate
Before starting, carefully remove these items from the case and visually check for any
signs of damage. If you are missing any item or find them damaged, please call the
manufacturer or your local supplier. Make sure that the power rating on the back label
corresponds to your power supply specification.
1
In accordance with IEC 60571:2008 Industrial platinum resistance thermometers and platinum temperature
sensors

6 MBW 473 Manual English V5.0
The instrument is calibrated with the supplied measuring head. Please be aware that
the specific coefficients entered in the instruments correspond to the measuring head
supplied with the instrument. Should a different measuring head be connected to the
instrument, the coefficients must be changed accordingly.
3.2 Installing the Measuring Heads
The heart of the 473 Dew Point Mirror Instrument is a highly sensitive and accurate measuring head.
Depending on your order, the 473 is supplied with either of the following measuring heads:
SH2
SH3
SHX
RP2
Use the supplied measuring head cable (2 m) to connect the measuring head to the back panel of the 473.
For further information on the measuring heads, please refer to sections 4.4 ‘Measuring Heads’and
8.2 ‘Mirror Cleaning’.

MBW 473 Manual English V5.0 7
3.3 Starting your 473
The 473 needs a source of AC power. It will work over a wide power range and will most likely operate
at your local voltage and frequency. Look at the back panel label for the power requirements of your
specific instrument.
1. Connect the AC power cord to the external power supply input and the external power supply
output to the back of the instrument.
2. Connect the measuring head and PRT
3. Turn the power switch to ON.
The display should become visible within a few seconds. If nothing happens, check the power source.
3.4 Dew Point Measurement
After connecting the measuring head or temperature probe, switch on the 473 and you will get an ex-
ternal temperature reading. If your instrument is equipped with a pressure sensor, the pressure read-
ing will be displayed. To measure humidity (dew point, frost point, %RH, etc.), the Dew/Frost Control
mode must be enabled and gas must be flowing across the mirror. If %RH readings are required, an
external temperature probe must be connected. To connect the external temperature probe, see sec-
tion ‘External Temperature Probe’on page 16. Alternatively, a fixed external temperature value may
be entered via the touch screen. Please follow the instructions in section 6.2 ‘External Temperature’.
You can test the 473 dew point measurement by measuring the dew point tem-
perature of the room.
First, make sure the measuring head is connected to the back panel of the 473.
Next, start the measurement by pressing the Dew/Frost Control key. This button
enables the system to cool the mirror to the dew or frost point temperature, moni-
tor the thickness of the condensation layer on the mirror, and precisely adjust the
mirror temperature to maintain a stable condensation layer. When Dew/Frost Con-
trol is enabled, the indicator on the key will turn green and the dew or frost point
temperature display will begin to show the mirror temperature as it cools to the
condensation point.
See section 5.2 ‘Selection of indicated Parameters‘for information on selecting
the parameters you wish to have displayed.
Fan
The SH2 and the SHX measuring head are equipped with a fan to pull a gas
sample through the measuring head. If you are using the SH2 or the SHX
measuring head, press the Fan key on the touch screen to turn the fan on/off. For
further information on the fan refer to section 4.4 ’Measuring Heads’.

8 MBW 473 Manual English V5.0
SH2
SHX
Fan
Fan

MBW 473 Manual English V5.0 9
4 Get to know your 473
4.1 Front Panel
The front panel of the 473 is equipped with a full color touch screen and a keypad for data entry. To
activate a menu option or toggle a function on or off, simply touch the desired key or object directly on
the screen.
When the 473 is turned on, the display will activate within a few seconds. A sample display configura-
tion is shown below. The display configuration can be customized, so your display may look different.
The use and the functions of the display are described in the next chapter.
Menu
Keys
Status
Line
Fixed
Function Keys
Data
Lines
Keypad

10 MBW 473 Manual English V5.0
Data Lines
The first three lines of the display show a numeric or graphic representation of the measured data. We
will refer to these first three lines as Data Lines.
If numeric, a data line contains the value
to the left, with the parameter description
and units to the right.
If graphic, a data line shows a simple
graph of data over time.
Data can be displayed in different parameters and units either numerically or graphically. Please refer
to section 5, ‘System Configuration’to learn how to configure your preferences.
Status Line
Balance
Although it is directly obtained from the intensity of the mirror’s reflected light signal, balance is effec-
tively the first derivative of the dew thickness measurement. It indicates the rate of growth or reduction
of the condensation layer on the mirror. While the dew or frost layer on the mirror surface is growing,
the indicator will be above center. The faster the layer is growing, the higher the indication. Converse-
ly, when the layer on the mirror surface is evaporating, the indicator will be below center. The faster it
disappears, the lower the indication. When the indicator is in the center, the thickness of the dew or
frost layer is neither growing nor evaporating, and the layer on the mirror surface is in equilibrium with
the sample gas. In this center position of the indicator, there is no net exchange of water vapor be-
tween the sample gas and the mirror surface. If the humidity of the gas sample is homogeneous and
of low enough variability for the control system to sense a steady value, the Balance indicator will
show a green Stable message, accompanied by a few short beeps.
Density
The Density Indicator graphically depicts the approximate thickness of the dew or frost layer on the
mirror surface. The 473 can automatically differentiate between dew and frost layers and the indicator
will display the current condensation state. The label in the density indicator will change from Layer
Density (when the state of the layer is uncertain) to either Dew Density or Frost Density (when ei-
ther dew or frost is being measured). For more information regarding Dew/Frost point determination
see section ‘Dew / Frost Control’ on page 30.
Near the bottom of the display is the Sta-
tus Line. The Status Line displays
Balance, Density, Contamination, and
Optic Power.

MBW 473 Manual English V5.0 11
Mirror Residue
The Mirror Residue Indicator graphically shows the amount of mirror contamination that was detected
during the last mirror check. If the bar covers more than a quarter of the space, we recommend that
you clean the mirror.
Optic Power
The optic power indicates the aging of the LED. When the instrument is used at higher measuring
head temperatures, the LED will age more quickly. When new, the optic condition bar graph will show
as ‘full’. When the indication starts to decrease, it provides the user with advanced notification that the
LED of the optical module may need service or replacement.
Fixed Function Keys
Menu Keys and Navigation
The menu selection is circular. Once you go past the last menu, the first one will appears again and
the process starts over. You can use the ±key on the keypad to move backward through the menus.
Use the Enter key to exit the menu.
The bottom line of the display
contains a row of fixed function
keys. These keys are used to
start and stop the gas flow fan
(only for SH2 and SHX), initiate
a mirror check, initiate mirror
cleaning, and switch dew/frost
control on or off. For further
information on the fan see
section 4.4, for the other
funcitons see section 5.4.
On the right hand side of the display there is a column of
menu keys. The bottom, dark gray key changes the cur-
rent menu by cycling to the next menu. Each of the light
gray keys changes their label and function based on the
menu that is currently selected.
Use the dark grey
key on the bottom
(menu selection key)
to move between
menus.

12 MBW 473 Manual English V5.0
4.2 Touch Screen
The 473 dew point mirror is operated using the touch screen. To make a menu selection or switch
functions on or off, touch the screen where appropriate with your finger or a stylus. Never use sharp
objects, as damage may occur.
Before using the 473 for the first time or when several users operate this unit, the touch screen can be
calibrated to suit the user. The procedure is described in chapter 8.1 ‘Calibrate the Touch Screen’ on
page 55.

MBW 473 Manual English V5.0 13
4.3 Back Panel
Without Options
With Barometric Pressure and Analog Output Options

14 MBW 473 Manual English V5.0
Power Switch
The main power switch is on the back panel above the power connection. The external power supply
has a built-in fuse and will automatically switch off in case of overload. To restart power, the main
power switch must be switched off and on again.
Power Supply
The output of the supplied external 24 VDC power supply is connected to the power connection on the
instrument back panel. The supported input voltage for the power supply is 100-120 VAC / 200-240
VAC at 50 to 60Hz.
RS-232
The RS-232 port can be used to connect the 473 to a desktop or laptop computer. The necessary 9-
pin RS-232 (serial) extender cable is a common accessory and can easily be obtained at any comput-
er store.
Measuring Head Connection
The 473 can be ordered with different types of measuring heads; the RP2, SH2, SH3 and SHX. These
measuring heads are connected to the back panel of the corresponding 473 display unit. The 473-
RP2, SH2 and SH3 are supplied with a 19-pin measuring head cable, while the 473-SHX is supplied
with a 30-pin measuring head cable.
Internal Barometric Pressure Sensor
As an option you can order an internal barometric pressure sensor to measure ambient pressure. To
measure chamber pressure or to calibrate the sensor, connect a 3 mm tube with a Swagelok fitting to
the pressure sensor port on the back panel.
Optional Analog Outputs
The 473 can be ordered with two optional analog outputs which are independently configurable. For
each of the analog outputs, you can choose which parameter to transmit and scale its range. Please
refer to section 5.7 ‘Configuration of Optional Analog Outputs‘on page 37 to learn how to configure
the analog outputs.