Superdew 3 Operating Instructions

Superdew 3
Hygrometer
Operating Instructions
Issue_0114
EC Declaration of Conformity
Contents
1.0
2.0
3.0
4.0
5.0
6.0
7.0
8.0
9.0
10.0
11.0
12.0
13.0
14.0
15.0
16.0
17.0
18.0
19.0
20.0
21.0
22.0
23.0
24.0
Unpacking your Shaw Moisture Meters Superdew 3 ................................... 4
General Information .................................................................................... 5
Safety Information ...................................................................................... 6
3.1 Warning ................................................................................................ 6
3.2 Isolation ................................................................................................ 6
Installation .................................................................................................. 7
4.1 Installing the Instrument to the Panel .................................................. 7
4.2 Instrument Wiring ................................................................................ 7
4.3 Power Supply ........................................................................................ 8
4.4 Alarm and Output Cable Connectors .................................................... 8
4.5 Sensor Cable ......................................................................................... 8
Installing the Air/Gas Sampling System ....................................................... 9
5.1 Piping Installation Schematic .............................................................. 10
5.2 Piping Schematic Component Index ................................................... 11
Installing and Commissioning the Sensor ................................................... 12
Default Instrument Configuration .............................................................. 13
Programming the Superdew 3 ................................................................... 13
8.1 Principle of Entering Numerical Data ................................................. 13
Configuring the Superdew 3 ...................................................................... 14
9.1 rAngE .................................................................................................. 14
9.2 oUtPt .................................................................................................. 15
9.3 AL1 and AL2 ........................................................................................ 16
9.4 rS485 (Communications) .................................................................... 16
9.5 PASS .................................................................................................... 17
9.6 PAnEL .................................................................................................. 17
Normal Operation of the Superdew 3 ........................................................ 18
Hotkeys ..................................................................................................... 18
11.1 Alarm Keys ........................................................................................ 18
11.2 Units ................................................................................................. 19
Calibration (Sensor Ranges up to 0 °C Dewpoint) ....................................... 19
Calibration (Sensor Ranges up to +20 °C Dewpoint) ..................................... 20
Monitoring the System .............................................................................. 20
Faults/Errors ............................................................................................. 21
Guarantee ................................................................................................. 21
Superdew 3 Specification .......................................................................... 22
Appendix A - Superdew 3 Setup Menu Flow Diagram ................................ 23
Appendix B - Alarm 1 & 2 Hotkey Flow Diagram ........................................ 24
Appendix C - Units Hotkey Flow Diagram ................................................... 25
Appendix D - rS485 Protocol ...................................................................... 26
Superdew 3 General Assembly Diagram .................................................... 29
Sensor Diagram ......................................................................................... 30
Sensor Holder Diagram ............................................................................. 30
3
1.0 Unpacking your Shaw Moisture Meters Superdew 3
Please examine the Superdew 3 package for any damage or mishandling. If
any damage is evident please notify the carrier and the Shaw Moisture Meters
representative from where this unit was purchased.
You should have received (if ordered):
● 1 Superdew 3 instrument
● 1 Shaw sensor
● 1 connecting cable (of the length specified on your order) or 2 metres
as standard
● 1 sensor holder
● 1 instruction manual
● 1 pressure dewpoint circular calculator
If anything is missing please contact your distributor immediately.
4
2.0 General Information
AL 1
MENU
UNITS
AL 1
AL 2
AL 2
ESC
AUTOCAL
SUPERDEW 3
DEWPOINT HYGROMETER
Every key on the Superdew 3 has two functions, the control function ( ,
,
& ) and the hotkey function (menu, units, alarm 1 and alarm 2). The use
of these commands is described in the following table:
ESC
Key
Control Function
Hotkey Function
(Menu)
Returns the user to the previous
screen, often without changing any
variables.
Used to enter the ‘setup’
menu by pressing and
holding for more than five
seconds.
The
key
(Units)
Used to decrease the selected digit
when setting a numerical variable.
Used to enter the ‘units’
menu.
The
key
(AL1)
Used to enter the ‘alarm 1’
Used to select the next digit when
menu.
setting a numerical variable or to
scroll through the options available.
The
key
(AL 2)
Used to confirm a numerical
variable or the selection of a
chosen option.
The
key
ESC
Used to enter the ‘alarm 2’
menu.
● The Superdew 3 is a DIN style panel mounted moisture monitoring
device designed to work in conjunction with the Shaw Sensors.
● The readout of moisture content is displayed on a backlit, five digit,
seven segment LED and available in any one of four selectable
engineering units. The selected unit is indicated on a separate seven
segment LED.
● The instrument is available in an AC or DC version.
● The Superdew 3 operation is controlled by a four button membrane
keypad. The user friendly software uses a simple menu selection
5
●
●
●
●
●
●
process and incorporates three hotkeys to enable moisture levels to be
read in different units and this allows quick access to both alarm settings.
A user controllable security system.
The Superdew 3 has an AutoCal potentiometer to perform auto
calibration of sensors.
The Superdew 3 has two full range alarms that can be set as rising or
falling edge triggered. These alarms have visual indication (LEDs) and
activate changeover relays for remote indication or control.
The Superdew 3 has a fully controllable linear 4 - 20 mA output.
The Superdew 3 also has rS485 capabilities, outputs the process variable
and unit status when polled.
Details of normal operation, engineering unit selection and configuration
of the instrument are described within this manual.
3.0 Safety Information
Read the safety information BEFORE installation.
3.1 Warning
Hazardous voltages may be present on instrument terminals. The equipment
must be installed by suitably qualified personnel and the instrument must be
mounted in a position that provides protection behind the panel to at least IP20.
3.2 Isolation
The power supply terminals and associated internal circuitry are isolated from
all other parts of the equipment in accordance with EN61010-1 for connection
to a category II supply (pollution degree 2). Any terminals or wiring connected
to the input or output, which are accessible in normal operation, must only
be connected to signals complying with the requirements for Safety Extra Low
Voltage (SELV) circuits.
The mains supply to the instrument must be protected by an external 1-amp
fuse and a suitable switch or circuit breaker, which should be near the
instrument.
Note: The instrument contains no user serviceable parts.
6
4.0 Installation
4.1 Installing the Instrument to the Panel
Make a cut-out in the donor panel 138.0 mm x 68.0 mm (DIN 43700).
The maximum panel thickness is 8 mm. If an effective IP65 weatherproof seal
is required, the minimum recommended panel thickness is 2.5 mm.
Pass the instrument case through the cut-out in the donor panel and attach
the two retaining screws to the studs on either side of the case.
Tighten the retaining screws onto the back of the donor panel until the
instrument is clamped securely in position. The screws must be tightened
sufficiently to affect a seal between the front of the donor panel and the back
of the instrument bezel but never over tightened.
4.2 Instrument Wiring
Wire the Superdew 3 as per figure 1.1 below.
Alarm 1
Coaxial Sensor
Connection
Alarm 2
Power Supply
90 - 250 V AC
50/60 Hz
Max Power
10 V A
+ - B A Com NO C NCNO C NC L N GND
OR
4 - 20 mA
Output
GND
N
LD
Power Supply
24 V DC
Max Power
figure 1.1
7
4.3 Power Supply
The Superdew 3 can be powered by either a 90 - 250 V AC or 24 V DC supply.
Connect the required supply cable to the appropriate terminals as shown in
figure 1.1.
The AC power supply should be between 90 - 250 V AC @ 50/60 Hz.
The power supply wires are retained by screws. Ensure that the exposed
section of wire is fully inserted and that no loose strands are exposed.
4.4 Alarm and Output Cable Connectors
Connect the required cables to the appropriate terminals as shown in figure
1.1. Note: The normally open and normally closed relay contact positions
and that the correct polarity and the maximum load specification are strictly
observed for the analogue outputs.
Ensure that the wire is fully inserted and that no loose strands are exposed.
4.5 Sensor Cable
Connect the sensor coaxial cable into the coaxial socket shown in figure 1.1.
Route the sensor cable to the intended site of the sensor.
8
5.0 Installing the Air/Gas Sampling System
The Piping Installation Schematic diagram (see section 5.1) shows all
components that could be used in a dry gas measurement application. Not all
the items shown will be required for every installation.
Care should be taken to ensure that the sample presented to the measuring
sensor is not contaminated with any other component that will damage,
contaminate or affect the sensor in a way that will impair the system accuracy.
It is strongly recommended that the sample should not contain particulate
matter, oil or other heavy hydrocarbon condensate. If these components
contaminate the sample system and/or the measuring sensor, the system
response time will be lengthened, although the sensor calibration will not be
effected.
The sample must not contain Ammonia, Chlorine, Ozone or any wet acid
vapours or liquid as these will permanently damage the sensor and impair
calibration accuracy.
The flow rate, although not critical to the sensor measurement, should be low
enough to avoid abrasion to the sensor surface without being so low as to
extend the system response time to an unacceptable level. In general, a flow
rate of between 2 and 3 litres/min at NTP will give the right balance.
The sensor is a variable capacitor, which is directly affected by changes in partial
pressure of water vapour and these changes that are proportional to the dew/
frost point temperature are displayed on the instrument indicator.
The measuring sensor can be installed directly into the process line but
this does create problems with access for maintenance and calibration. It is
for these reasons that we recommend that the sensor will be installed in a
bypass, fast loop or total loss sample system where the sensor is accessible
without interrupting the main process flow line.
9
5.1 Piping Installation Schematic
4A
6
5
3
7
10
P
11
2
9
1
MAIN
PROCESS
LINE
8
4B
Notes
a. The sample pipe should be on the upper surface of the horizontal pipe or on a vertical section of pipe
wherever possible.
b. The sample tube should run continually upwards from the sample point. If this is not possible then an
inspection port or drain tap should be installed at the lowest point in the system.
10
5.2 Piping Schematic Component Index
1. Sample Isolation Valve - This is a recommended item as it allows access
to the sample system without interrupting the main process line.
2. Filter Unit – A filter unit is recommended when the samples are likely
to contain particulate matter. If the air/gas sample contains heavy
hydrocarbon condensate, the filter must be of the coalescing type with
a drain. The filter unit should be positioned as close to the sample point
as practical.
3. Sample Tube – This should be stainless steel for dry air or gas applications
but copper or carbon steel can be used where wetter gases are to be
measured. If any section of the sample tube must be flexible then PTFE
should be used. In most cases, 3 mm OD (1/8”) is sufficient as it provides
good system response time within minimum flow. 6 mm OD (1/4”) tube
can be used where pressure drops are too high.
4. Pressure Reduction Valve or Pressure Regulator – If the sample is to
be measured at atmospheric pressure then the valve 4A should be
fitted and 4B omitted from the system. If the sample is to be measured
at full line pressure and the exhaust vented to atmosphere, then valve
4B should be fitted and 4A omitted from the system. If measurements
are to be taken at full line pressure and the sample is to be returned
to a part of the main line or a vent, which is at a pressure higher than
atmospheric, and the input to that line needs a controlled pressure
then both 4A and 4B will be required.
5. Sample Pressure Gauge – This is not a critical part of the moisture
measurement but may be required if dew/frost point measurements
are to be made at higher than atmospheric pressure.
6. Measuring Sensor
7. Sensor Holder
8. Desiccant Chamber – This item is required when the sampling is to be
intermittent. When installed it prevents the ingress of wet air to the
sample system, while the sample is not flowing, improving the response
time.
9. Flow Control Valve – This can be a separate item or combined with the
flow indicator.
10. Flow Indicator – The recommended sample flow is 2 to 3 SL/M.
11. Sample Exhaust – The exhaust can be vented to atmosphere or
returned to the process line as discussed above.
11
6.0 Installing and Commissioning the Sensor
It is advisable to carry out an initial purge routine of the sample loop before
installing the sensor. This is to remove the possibility of sensor damage on
start up.
Refer to the Piping Installation Schematic in section 5.1.
Open the inlet isolation valve slowly until a small flow of air/gas (at
atmospheric pressure) flows through the inlet pipe work to the sensor holder,
exhausting through the sensor entry port of the sensor holder.
Allow this purge to continue for about 15 to 20 minutes to remove any
residual moisture from the sample pipe work and components.
Close the inlet isolation valve and install the sensor into the sensor holder.
Locate and connect coaxial cable in position on the sensor.
Open the inlet valve slowly, by opening all valves after the sensor holder, allow
a low pressure purge through the whole sample system.
Note: If a closed by-pass loop is installed, this section of the procedure is not
possible. Set the required flows within the sample loop.
This completes the installation and commissioning but on initial start up, it
could take several hours for the system to reach equilibrium. The Superdew
3 will now indicate the dewpoint of the air/gas surrounding the sensor and
the analogue output would be giving mA signals proportional to the indicated
dewpoint.
12
7.0 Default Instrument Configuration
The standard factory settings are as follows:
● The instrument will display the moisture content in °C dewpoint
● Both alarms are set to trigger when rising above the upper limit
● The output span is set to 4 - 20 mA
● The 4 - 20 mA output is set to the full span of the selected range
e.g. 4 mA = -80 °C
20 mA = 20 °C
● All security codes are defaulted to 0000
8.0 Programming the Superdew 3
8.1 Principle of Entering Numerical Data
See Appendix A, B & C for flow charts.
The key allows the user to leave a part of the menu without changing any
settings.
ESC
Wherever a numerical value has to be entered into the Superdew 3 the
following text will be found. “Use the ,
&
keys to enter……”. The basic
principle used to enter numerical values (integer or floating point) is described
here.
The first character of the LCD display flashes to indicate it is active. Use the
key to select the required number between 0 and 9 (plus the minus sign) then
press the
key to make the second character flash. Again, use the
key
to select the required number between 0 and 9, press the key to make
the third character flash etc.. Continue this process until all characters
are entered. In the case of a floating point numbers in lb/MMscf or ppm,
pressing the key again makes the decimal point (dp) active. Use the key
to position the dp in the required position. Pressing the key at any point
confirms the numerical value. °C and °F are fixed to 1 dp.
13
Note:
The Password used within the Superdew 3 is made of four
integers and does not use the dp.
Note:
To leave the numerical part of this routine without saving,
simply press the key.
ESC
9.0 Configuring the Superdew 3
See Appendix A.
Operation:
To enter the setup menu press and hold the key for five
seconds. This will display the ‘SEtUP’ message on the LED as
in the Superdew 3 Setup Menu Flow Diagram (see Appendix
A). Pressing the key again enters the setup menu map at
the ‘rAngE’ option on the top level. There are seven top level
options described.
Note:
The default setup will go directly from the SEtUP message to
the rAngE screen. However, if the user has set a password,
then the user is prompted to enter the correct password
before continuing on to the top level.
Note:
Most of the screens within the menu have an active 10
second time-out. Therefore, if no keys are pressed within this
period the unit reverts automatically to normal operation. In
most cases where the 10 second time-out occurs, changes
will not have been saved.
ESC
9.1 rAngE
Description:
14
The ‘rAngE’ option allows the user to select the required
sensor range. This option is used to match the Superdew 3 to
the sensor connected to the unit. For example a ‘RED’ sensor
requires that the Superdew 3 ‘rAngE’ option ‘rEd’ is selected.
Operation:
While ‘rAngE’ is displayed press the
key to enter the
subroutine. The display now shows the currently selected
sensor range. Use the key to scroll through the options until
the required range is displayed. Press the key to select the
new range. The message ‘Conf’ will be displayed. Press the
key again to confirm selection.
Note:
Pressing the key at any time reverts to the ‘rAngE’ screen
without saving any change.
Note:
See Superdew 3 Specification (pg 22) for detailed information
on ranges.
ESC
9.2 oUtPt
Description:
The ‘oUtPt’ option of the Superdew 3 allows the user to set
the span and the range over which the 4 - 20 mA operates.
The default setting is for the output to cover the full operating
span of the selected range e.g. 4 mA to equal -100 °C and 20
mA to equal 0 °C. It is possible to set a more focused span,
such as 4 mA to equal -60 °C and 20 mA to equal -20 °C. It is
also possible to select 0 - 20 mA as well as 4 - 20 mA.
Operation:
While ‘oUtPt’ is displayed press the key to enter the
subroutine. The display now displays ‘SPAn’ use the key to
select either ‘Hi’, ‘Lo’ or ‘SPAn’ then press the key.
Note:
If the key is pressed the Superdew 3 will return to the
‘oUtPt’ screen.
ESC
If the ‘SPAn’ option is selected, use the key to select the
required span (0 - 20 mA or 4 - 20 mA). Press the key to
confirm selection.
If either the ‘Lo’ or ‘Hi’ options are selected the screen will
now display the current High or Low range value. Use the
& keys to enter the new value. Press the key to confirm
and save the new value. The other range limit can now be set
by following the same process.
15
Note:
Once the key is pressed to set either the high or low range
limit that value is written to memory and will not revert to
the previous value even if the 10 second time-out occurs.
9.3 AL1 and AL2
Description:
The AL1 and AL2 option allows the user to set up two
independent alarms. Trip point, direction of trigger’ relay
enable status, latching status and hysteresis can be set within
this option.
Operation:
While ‘AL1’ or ‘AL2’ are displayed press the key to enter
the subroutine. The LED now displays ‘SEtPt’. Use the key
to select the required function and then press the key.
Note:
If the key is pressed the Superdew 3 will return to the
‘AL1’ or ‘AL2’ screen.
ESC
Depending on the option selected, the user will now be able to perform the
following functions:
‘SEtPt’
‘tYPE’
‘rELAY’
‘LAtCh’
‘HYSt’
Note:
Enter the alarm set point.
Select if the alarm is to activate on a rising signal ‘Hi’, falling
signal ‘Lo’ or ‘OFF’.
Select if the relays are energised ‘En’ or de-energised ‘dE-En’
Set if the alarm is latch ‘YES’ or not latching ‘nO’.
Enter the hysteresis value. Once the key is pressed to set any of the alarm parameter,
that value is written to memory and will not revert to the
previous value even if the 10 second time-out occurs.
9.4 rS485 (Communications)
Description:
16
The rS485 option allows the user to set the Superdew 3
address and communication baud rate used when the
Superdew 3 is communicating with a PC using rS485 pointto-point communications.
Operation:
While ‘rS485’ is displayed press the
key to enter the
subroutine. The display now displays ‘Addr’ use the key to
select either ‘Addr’, or ‘bAUd’ then press the key.
Note:
If the key is pressed the Superdew 3 will return to the
‘rS485’ screen.
ESC
If the ‘Addr’ option is selected the screen will now display the
current address value. Use the & keys to enter the new
value. Press the key to confirm and save the new address.
Note:
Once the key is pressed to set the address, that value is
written to memory and will not revert to the previous value
even if the 10 second time-out occurs.
Note:
Legal addresses are 1 to 32.
If the ‘bAUd’ option is selected, use the key to select the
required baud rate (9600, 4800, 2400 or 1200). Press the
key to confirm selection.
For rS485 Protocol please see Appendix B
9.5 PASS
Description
The PASS option allows the user to alter the security
password used to protect the ‘SetUP’ menu.
Operation
While ‘PASS’ is displayed press the key to enter the
subroutine. The LCD now displays ‘0000’. Use the ,
keys to enter the new password.
&
9.6 PAnEL
Description
The PAnEL option allows the user to restrict the functions
of the front panel hotkeys. If the ‘On’ option is selected, the
hotkeys are unrestricted.
17
Operation
While ‘PAnEL’ is displayed, press the key to enter the
subroutine. The LCD now displays ‘On’ or ‘OFF’. Use
the key to select ‘On’ or ‘OFF’. Press the key to confirm
selection.
10.0 Normal Operation of the Superdew 3
In normal operation, the Superdew 3 will display the current moisture value
of the connected sensor. The value is displayed in the currently selected
engineering units, which is indicated by the small LED.
The alarm LEDs (AL1 and AL2) will light whenever an alarm condition occurs
and only turn off when the alarm condition clears.
Remote signalling of an alarm condition is provided by two internal
changeover relays that trigger at the same time as the LEDs.
11.0 Hotkeys
11.1 Alarm Keys
See Appendix C
Description
The ‘AL1’ and ‘AL2’ hotkeys allow the user to review and alter
the alarm trigger points without interrupting the monitoring
process.
If the hotkeys are restricted by the ‘PAnEL’ function then the
alarms can only be reviewed.
Operation
To review the alarm trip point press the (AL1) or (AL2) key
momentarily. The screen will display the set trip point for two
seconds before reverting to the dewpoint reading.
To alter the trip point press and hold the (AL1) or (AL2) keys
for longer than five seconds. The screen will display and allow
the user to alter the trip point using the ,
& keys.
18
11.2 Units
See Appendix D
Description
The ‘Units’ hotkey allows the user to review and alter the
displayed units.
If the hotkeys are restricted by the ‘PAnEL’ function then the
units can only be reviewed. If the key is pressed to select
another moisture unit, the Superdew 3 will display ‘LOC’ and
not change the moisture units.
Operation
To review the Superdew 3 moisture units press the (Units)
key for longer than five seconds. The screen will display the
current moisture reading in the currently selected moisture
units. Press the key to scroll through the current moisture
level in each of the moisture units. Press the key to select
a different moisture unit.
12.0 Calibration (Sensor Ranges up to 0 °C Dewpoint)
The system relies on the fact that each sensor is designed to give no further
increase in reading when it reaches its maximum moisture level. This means
that, for instance, the Silver Spot or Red Spot sensor will read –20 °C dewpoint
when it is exposed to gas at –20 °C dewpoint but will continue to read -20
°C dewpoint when it is exposed to wetter gas. The system can therefore be
calibrated very simply by exposing the sensor to anything wetter than –20 °C
dewpoint and adjusting the reading to that point on the display. For the Grey
Spot Sensor the maximum level is 0 °C DP and the same principle applies.
In practice, an AutoCal is performed as follows:1.
2.
3.
Ensure the Superdew 3 is powered up.
Remove the sensor from the sensor holder and expose it to
ambient conditions for at least 1 minute.
Check the Superdew 3 reading. It should display the maximum
level of dewpoint for the instrument (i.e. -20 °C for Red and 0 °C
for Grey).
19
4.
If the unit is reading incorrect then use a small screwdriver to
turn the AutoCal potentiometer (found on the front panel of
the instrument under the knurled cap) clockwise to increase the
reading (wetter) or anticlockwise to decrease it.
13.0 Calibration (Sensor Ranges up to +20 °C Dewpoint)
In order to calibrate a +20 °C sensor, it is necessary to measure the ambient air
dewpoint by some other method. Careful use of a sling or whirling hygrometer
can achieve accurate results or a cooled mirror device can be used.
The following procedure should be used:
1.
2.
3.
Ensure the Superdew 3 is powered up.
Remove the sensor from the sensor holder and expose it to
ambient conditions for at least one minute.
Compare the reading of the Superdew 3 in the ambient air, against
the actual moisture level obtained by another method. Turn the
AutoCal potentiometer (found on the front panel of the instrument
under the knurled cap) using a small screwdriver clockwise to
increase the reading (wetter) or anticlockwise to decrease it.
14.0 Monitoring the System
The system is designed to operate continuously with a minimum amount of
operator input.
It is, however, advisable to inspect the sample loop periodically to ensure that
the required flows are being maintained.
The number and type of items employed in the sample loop will determine
what, if any, other routine checks should be made. If, for instance, a filter is
used, the filter element should be inspected periodically and changed when
necessary.
20
The instrument should not require any routine maintenance but if any
malfunction is suspected, it is advisable to contact your local dealer.
Should it be necessary at any time or for whatever reason, to change either
the instrument or sensor, it should be noted that the components of the
Superdew 3 sensor system are completely interchangeable.
15.0 Faults/Errors
If the sensor is short-circuited the display will read ‘Short’, the voltage output
will drive to full scale, the current output will drive to 24 mA and both alarms/
relays will trip.
If the user tries to enter an alarm level above the maximum value of the
sensor range selected, the Superdew 3 will display ‘oVEr’.
16.0 Guarantee
All Shaw products are guaranteed for two years from the date of purchase,
some exclusions are as follows:
Removing protective guard from any sensor, subjecting sensor to shock
or black list gases e.g. caustic and acidic gases like ammonia and chlorine,
tampering with any internal electronics and applying incorrect supply voltage
to meters, subjecting to excessive flow rate, contaminants and general misuse.
If you suspect a fault which you feel needs to be attended to under guarantee
please contact us for assistance hopefully to help fault find and effect a
remedy and if this is not successful to give precise instructions for the return
for inspection.
No equipment will be replaced or repaired without having been returned for
inspection either to ourselves or an authorised distributor.
21
17.0 Superdew 3 Specification
Transmitter:
Compatible with the Shaw Sensor
Enclosure:
DIN Style, 144 mm (w) x 72 mm (h) x 116 mm (d)
PCB Layout:
General PSU PCB and display PCB to fit the DIN
enclosure
Display:
Five characters LED display. Largest positive number
99999
Alarm & Range Limits: °C dewpoint
°F dewpoint
P (PPM)
L(lb/MMscf)
22
Upper Limit
20.0
68.0
9999
1000
Lower Limit
-100.0
-184.0
0.001
0.001
Front Panel:
A membrane keyboard with four keys and four windows
for the four character LCD, the single character seven
segment LED and the two alarm LEDs.
Power Supplies:
Universal 90 - 250 V AC 50/60 Hz or 24 V DC versions.
Alarms:
Two single pole changeover contacts (NO/C/NC), rated
at 10 A at 240 V AC. Alarm trip at set point with 0.1 °C
(or equivalent) hysteresis to eliminate relay chatter.
Analogue Outputs:
Isolated 4 - 20 mA as standard. The span of the outputs
can be set by software control.
Temperature Range:
Electronics -10 °C to +60 °C
EMC:
Designed to meet the EMC and LVD directives.
Sensor -10 °C to +50 °C
Press ESC
for > 5 secs
SEtUP
ESC
0000
PASS
SiL
YEL
gLd
Lo
SPan
bLU
ESC
Hi
COnF
ESC
oUtPt
rEd
gr4
PUr
rAngE
ESC
ESC
ESC
60.0
20.0
0-20
4-20
ESC
ESC
HYSt
LAtCh
rELAY
tYPE
SEtPt
AL1
ESC
ESC
ESC
ESC
ESC
1.0
YES
nO
En
dE-En
OFF
Hi
Lo
-45.0
Same as AL1
AL2
ESC
ESC
Return to Moisture
Display
bAUd
Addr
rS485
ESC
ESC
ESC
1200
2400
4800
9600
02
ESC
(if Password Set)
0000
ESC
Off
On
PAnEL
Use & to enter
required numerical values
ESC
ESC
PASS
18.0 Appendix A - Superdew 3 Setup Menu Flow Diagram
23
24
Press AL 1
> 5 secs
Momentary
Press AL 1
-20.0
Current
Set Point
-20.0
Current
Set Point
Alarm 1
AL 1
-20.0
Numerical input screen
Use the
&
keys
to enter the new set point
Timeout after 2 seconds.
Screen reverts to
display moisture reading
Press AL 2
> 5 secs
-20.0
Current
Set Point
Use & to enter
required numerical values
Auto transition
Once
is pressed the
screen reverts back to
displaying current
moisture reading.
Momentary
Press AL 2
-20.0
Current
Set Point
Alarm 2
AL 2
-20.0
Numerical input screen
Use the
&
keys
to enter the new set point
Timeout after 2 seconds.
Screen reverts to
display moisture reading
Once
is pressed the
screen reverts back to
displaying current
moisture reading.
19.0 Appendix B - Alarm 1 & 2 Hotkey Flow Diagram
Press Units
> 5 secs
UnitS
ESC
254
5355
29.4
-1.4
L
P
°F
°C
If
is pressed
the Superdew reverts back
to the normal screen
without changing units
ESC
Scroll
Enter
ESC
Once
is pressed the
Superdew reverts back to
the normal screen
displaying moisture in the
newly selected units.
20.0 Appendix C - Units Hotkey Flow Diagram
25
21.0 Appendix D - rS485 Protocol
Data Collection System Output
Overview
1. rS485 interface is required.
2. Baud rate and address are set from the front panel.
3. Data Bits = 8, Parity = none, Stop Bits = 1, Flow Control = none.
4. All transmission is binary (i.e. a byte represents 0 to 255 NOT ASCII
characters).
5. A Hart-like protocol is used.
6. A single Superdew 3 may be connected using the universal address of 0.
7. Up to 32 separate Superdew 3 instruments may be connected using address
1 to 32 (NOT including the universal address of 0).
8. Superdew 3 is the slave3 and must be polled for data.
9. There is only one command and that returns the process value in the units
set from the front panel.
10. Alarm state and a sensor short are returned in a 2-byte status word.
Details
rS485 Receive Protocol (as seen by Superdew 3)
Byte
0, first
1
2
3
4
5
6
7
8
9
10, last
26
Description
Preamble
Master-to-Slave
Address
Command
Data Length
Data Bytes
Checksum
255
255
255
255
255
2
0 to 32
24
1
0
8-bit Arithmetic Exclusive-Or of bytes 5 to 9
rS485 Transmit Protocol (as seen by Superdew 3)
Byte
0, first
1
2
3
4
5
6
7
8
9
10
11
12
12
14
15, last
Description
255
255
255
255
255
6
8-bit Arithmetic Or of Address with 128
24
6
bits 15 - 8
bits 7 - 0
Process Value
Single Precision (4-Byte Float)
IEEE 754 Format
Big-endian (first byte = ms)
8-bit Arithmetic Exclusive-Or of bytes 5 to 14
Preamble
Slave-to-Master
Return Address
Command
Data Length
Status
Data
Checksum
Transmit Status
Bit
15, first (ms)
14
13
12
11
10
9
8
7
6
5
4
3
2
1
0, last (ls)
Description
Not defined
Alarm 2: user to clear
Alarm 1: user to clear
Alarm 2
Alarm 1
Not defined
Sensor short
Not defined
27
Example using universal of 0
255
255
255
255
255
Poll message sent to Superdew 3
2
0
24
1
0
27
255
255
255
255
255
6
Reply transmitted by Superdew 3
128
24
6
0
0
<4 bytes of single float>
<1 byte of checksum>
28
22.0 Superdew 3 General Assembly Diagram
Front View
Rear View
116mm
Side View
8mm
72mm
65mm
8mm (max)
29
23.0 Sensor Diagram
143mm
74mm
63mm
(7/8”) AF Hex
M14 x 1.25mm Pitch
24.0 Sensor Holder Diagram
4 Mounting Holes 5.5 mm ø (0.22 inch ø)
47 mm (1.85 inch)
60 mm (2.36 inch)
34 mm ø (1.34 inch ø)
46 mm (1.81 inch)
3 mm (0.125 inch)
25 mm (0.98 inch)
15 mm (0.6 inch)
65 mm (2.56 inch)
80 mm (3.15 inch)
90 mm (3.54 inch)
43 mm (1.77 inch) nominal 43 mm (1.77 inch) nominal
NOTE: The assembly is shown with ¼ inch OD tube fittings. The dimension across the tube fittings will vary for all other size fittings.
30
Shaw Moisture Meters (UK) Ltd.
Len Shaw Building
Bolton Lane
Bradford BD2 1AF
England
t. +44 (0)1274 733582
f. +44 (0)1274 370151
e. mail@shawmeters.com
www.shawmeters.com
Superdew 3 Operating_Instructions_Issue _0114
© SHAW MOISTURE METERS UK (LTD) 2010
Shaw Moisture Meters (UK) Ltd. | Len Shaw Building | Bolton Lane | Bradford | BD2 1AF | England
t. +44 (0)1274 733582 | f. +44 (0)1274 370151 | e. mail@shawmeters.com | www.shawmeters.com
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