Shaw Superdew 3 User manual

Superdew 3
Hygrometer
Operating Instructions

Shaw Moisture Meters (UK) Ltd
Len Shaw Building
Bolton Lane
Bradford
BD2 1AF
England
t. [phone]
f. [phone]
e. [email protected]
www.shawmeters.com

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 2m as standard.
•1 Sensor holder
•1 Instruction Manual
•1 Pressure Dewpoint Circular Calculator
If anything is missing please contact your distributor immediately.

Index
1 General Information ……………………………………………… 1
2 Safety Information ………………………………………………… 2
2.1 Warning ………………………………….......................................... 2
2.2 Isolation ……………………………………………………………….. 2
3 Installation …………………………………………………………… 2
3.1 Installing the instrument into a panel ………………………………. 2
3.2 Instrument wiring …………………………………………………….. 3
3.3 Power supply …………………………………………………………. 3
3.4 Alarm and output cable connectors ………………………………… 3
3.5 Sensor cable ………………………………………………………….. 3
4 Installing the air/gas sampling system ………………………… 4
4.1 Piping installation schematic ………………………………………… 5
4.2 Piping schematic component index ………………………………… 5/6
5 Installing and commissioning the sensor ……………………… 6
6 Default instrument configuration ……………………………… 7
7 Programming the Superdew 3 …………………………………… 7
7.1 Principle of entering numerical data ………………………………… 7
8 Configuring the Superdew 3 ……………………………………… 7/8
8.1 rAngE ………………………………………………………………….. 8
8.2 oUtPt …………………………………………………………………… 8
8.3 AL1 & AL2 …………………………………………………………….. 8/9
8.4 rS485 (communications) …………………………………………….. 9
8.5 PASS ………………………………………………………………….. 9
8.6 PAnEL …………………………………………………………………. 9
9 Normal operation of the Superdew 3 …………………………… 10
10 Hotkeys ……………………………………………………………… 10
10.1 Alarm Hotkeys ………………………………………………………… 10
10.2 Units ……………………………………………………………………. 10
11 Calibration (Sensor Ranges up to 0°C Dewpoint) …………… 11
12 Calibration (Sensor Ranges up to +20°C Dewpoint) ………… 11
13 Monitoring the System …………………………………………… 11/12
14 Faults / Errors ……………………………………………………… 12
15 Superdew 3 Specification ………………………………………… 12
16 Appendix A – Superdew 3 Setup Menu Flow Diagram
17 Appendix B – Alarm 1 & 2 Hotkey Flow Diagram
18 Appendix C – Units Hotkey Flow Diagram

Superdew Operating Instructions
Page 1
AL 1 AL 2
SUPERDEW 3 DEWPOINT HYGROMETER
AL 1 AL 2
AUTOCAL
UN ITSMENU
ESC
1
General Information
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 table below:
Key Control function Hotkey function
The
(Menu)
key 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 5 seconds
The
(Units)
key Used to decrease the selected digit
when setting a numerical variable. Used to enter the Units menu
The
(AL 1)
key Used to select the next digit when
setting a numerical variable or to scroll
through the options available.
Used to enter the Alarm 1
menu
The
(AL 2)
key Used to confirm a numerical variable or
the selection of a chosen option. 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, 5-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 process and incorporates three hot keys 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 4-20mA 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.

Superdew Operating Instructions
Page 2
2
Safety Information
Read the safety information below, before installation.
2.1 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.
2.2 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.
3
Installation
3.1 Installing the instrument into a panel
Make a cut-out in the donor panel 138.0 x 68.0mm (DIN 43700).
The maximum panel thickness is 8mm. if an effective IP65 weatherproof seal is required, the
minimum recommended panel thickness is 2.5mm.
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.

Superdew Operating Instructions
Page 3
3.2 Instrument wiring
Wire the Superdew 3 as per figure 1.1 below.
3.3 Power supply
The Superdew 3 can be powered by either a 90-250V AC or 24V 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 - 250V AC @ 50/60Hz.
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.
3.4 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.
3.5 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.
Coaxial Sensor
Connection
+ - A B Com NO C NCNO C NC L N GND
GND
N
LD
Power Supply
90-250V AC
50/60 Hz
Max Power
10VA
OR
Power Supply
24V DC
Max Power
Alarm 2 Alarm 1
4-20mA
Output
Zero

Superdew Operating Instructions
Page 4
4
Installing the air/gas sampling system
The piping installation schematic diagram (see section 4.1) 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 with 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 be installed in a bypass, fast loop or total loss sample system where
the sensor is accessible without interrupting the main process flow line.

Superdew Operating Instructions
Page 5
4.1 Piping installation schematic
4.2 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) 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, 3mm OD (1/8”)is sufficient as it provides good system response
time within minimum flow. 6mm OD (1/4”) tube can be used where pressure
drops across the 3mm tube are too high.
3) 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.
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, the valve 4B should be fitted and 4A
1
2
3
4A
4B
5
6
7
8
9
10 11
P
Main
Process
Line
Notes
a. The sample point should be on the upper surface of the horizontal pipe, or from a
vertical section of pipe, wherever possible.
b. The sample tube should run 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
sample system.

Superdew Operating Instructions
Page 6
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 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.
5
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 sample system schematic in section 4.1. 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.