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Technical FAQ's

AIR & WATER FLOW

AV-D (AV-622)
Question Do you have to carry out the insertion calculation on a non- circular duct?
Answer No, insert the whole probe unless ducts too small and use the DPA (duct flange)
AV-W
Question How does the direction sensor work?
Answer It’s a 0-1kΩ resistive output, N= 0Ω  /  E =250Ω  S= 500Ω  /  W=750Ω 
Rotation is 357˚ (1kΩ) before switching back to 0Ω (N)
Question How does the wind speed work?
Answer It’s a pulsed output, 1 contact closure per 1.493 meters.  This isn’t per second or mph. There is a simple calculation to convert this to m/s:
Air Velocity (in m/s) = (number of pulses counted in 1 minute / 60) * 1.493 
Example, if you count 56 pulses in 1 minute, the formula becomes;                                       AV = (56/60) *1.493 = 1.39 m/s
AV-EP/MPS 
Question How do I select the right size probe for my duct size?
Answer You should always select the widest section of the duct, for example 600 x 1000 the AV-MPS-1000 is the right probe to use.  The reason for this is to get the best sample rate across the duct.  You could use the AV-EP-600 but it won’t quite be as arcuate.
Question How accurate are the velocity probes?
Answer It's difficult to unable verify the accuracy of only the velocity probes.   The AV-EP & AV-MPS probes takes an average reading, which is just simplified, cost-effective way to measure air velocity.  In reality, it's probably impossible to state an accuracy figure for the probe, as so many variables are involved.
FS-521 
Question Can this be mounted in a vertical duct?
Answer Yes, but you may need to adjust the sensitivity sprint to counterbalance the weight of the paddle. 
General note The FS range of products are not WRAS approved. We have not put these forward for certification for use with drinking water. 
FS-541 
Question
Do I have to buy the stainless steel paddles separate?
Answer
No the 4 paddles are supplied with the product, suitable for pipe from 1” up to 8”.
General note The FS range of products are not WRAS approved. We have not put these forward for certification for use with drinking water. 
LS-712 
Question
How does the LS-712 work?
Answer This is effectively a static pressure sensor, within the cable is a vented tube that must be left open to atmosphere. For every 1 meter of water above the sensor this is equal to 98.07mbar.  The LS-712-A for example has a range of 0 to 300mbar, 0 to 3.06 meters
General note The LS range of products are not WRAS approved.
LS-CAP
Question
How do I know what one to order?
Answer
The LS-CAP1 is for conducting liquids, water for example and the LS-CAP2 is for non-conducting liquids like oil.
Question
Can they be cut down?
Answer No! and we do not do custom lengths.
General note The LS range of products are not WRAS approved. 
LS-UT
Question
Can this be used in an oil tank?
Answer No, oil when its pumped into a tank will foam, this will cause the ultrasonic signal to not reflect back up to the transducer.  It will result in a “lost echo” and will not record any levels.  The best product to use in an oil tank is the LS-CAP-2.
General note The LS range of products are not WRAS approved. 
LS-FL
Question
Can this be used in an oil tank?
Answer No, the cable is PCV which is time will become brittle and break.  We haven’t an option for oil.  This can only be used in a clean water tank (not effluent).
General note The LS range of products are not WRAS approved. 
LS-TM
Question Can this be used for either high or low alarms?
Answer Yes, its supplied with the float being normally open so will close when the float rises (high alarm) if a low level alarm is needed, remove the circlip, reverse the float and re-site the circlip. 
General note The LS range of products are not WRAS approved. 

AIR QUALITY

GS-AQ
Question What is air quality?
Answer
It’s a mixture of different things, but basically it was something that was once living.  VOC (Volatile Organic Compounds) these derive from things like oils, cooking smells, tobacco, perfume, paints, glues the list is not quite endless but are many more.
Question
Will this pick up CO2?
Answer No, you will need to buy the GS-CO2 sensor for this.
Question Can I use the DPA as my duct is smaller than the probe length?
Answer No, the probe has holes which are used to create what’s known as a venturi effect.  Air is naturally drawn into and out of the housing.  The sensing module is inside the actual main housing not at the end of the probe as the module itself is too big.
GS-CO2
Question
Can I mount this on the ceiling?
Answer
Not really, the speed of response will be compromised.  The housing is designed to allow the air to naturally convert over the CO2 module.
Question What set point level should I be trying to control my room around?
Answer Typically this is between 800 & 1000ppm (parts per million) any less you will be over ventilating the room and any more in time you will have sleepy occupants
Question
Can I use the DPA as my duct is smaller than the probe length?
Answer No, the probe has holes which are used to create what’s known as a venturi effect.  Air is naturally drawn into and out of the housing.  The sensing module is inside the actual main housing not at the end of the probe as the module itself is too big.
Question Do you have a CO2 sensor with a relay output?
Answer
No, they are only active, but by using the IO-RM-A adjustable relay module you can adjust the relay on/off points to suit your switching levels.
GS-CO
Question
What should my maximum CO levels be?
Answer
We can only give them the recommended levels quoted by the HSE:
Short term exposure: 15 minutes 100ppm
Long term exposure: 8 hours 20ppm
We HAVE to say that the MUST check with local H&S officials.
Question
Can I use the DPA as my duct is smaller than the probe length?
Answer No, the probe has holes which are used to create what’s known as a venturi effect.  Air is naturally drawn into and out of the housing.  The sensing module is inside the actual main housing not at the end of the probe as the module itself is too big.
GL-CO
Question Can you mix the sensor types on the 2 & 3-channel versions?
Answer
Yes, you can.  But you can for example only have 2 sensors on the 2-channel version you cannot daisy chain more.
Question
Can I use a GL-CO-SRS sensor as a standalone device?
Answer No, you must use this range of sensors with the GL-CO-RFG range of controllers.
SD-D (SD-622)
Question
My duct is 1000mm, can I use this?
Answer No, the maximum duct size is 450mm.
Question How does it work?
Answer Infra-red, inside the housing there is a sender and receiver.  A mirror at the end of the probe bounces back to the receiver, if this beam is broken for more than 2 seconds the alarm will then trigger.

CONTROLLERS

FC
Question
Do you do these for 3-phase motors?
Answer
No, single phase only up to 10A. 3-Phase motors are usually controlled by a device called an inverter drive.
Question
How does it work?
Answer Exposed adjustment versions or from a remote signal it’s the same principle. These vary the voltage out to the motor (inverters vary the Hz, so a very different type of control).
Question
Will they work with any motor?
Answer
Only voltage controllable, they would need to check with the motor manufacture to check if they can, it's not a question we can answer.
RE
Question
Does the lager 3-phase (≥27kW) require the extra 230V?
Answer Yes, without this then the electronica circuit isn’t enabled and therefore won’t work.
Question
Only 2-phases are switching.
Answer
That’s correct, control is only done via 2-phases
Question
How does this work?
Answer The output is pulsed on a proportional basis.  The cycle time is set as default to 5 seconds, if you input a 5Vdc signal the output is on for 2.5 seconds and off for 2.5 seconds.
Question My load is 19kW what one do I use, can I use the RE-3P-18 as its only just over?
Answer
You always select the one where the load doesn’t exceed the power as quoted in the part code.  A 19kW load MUST use the RE-3P-27.

INPUT/OUTPUT MODULES

IO-A-RM
Question
Will this convert 0-10Vdc to 4-20mA?
Answer
Yes it will of vice versa.
Question
Is this dual channel?
Answer
No this is single channel (will only convert one signal)
IO-DIM
Question
Can I mix the input signals i.e. VFC & 24V?
Answer Definitely.
Question
The red/green LED is flashing, what does this mean?
Answer Take a look on the corresponding data sheet, there is a breakdown of the LED status.  It usually indicates that there is a problem on their side, not a product problem.
IO-RM-x
Question The red/green LED is flashing, what does this mean?
Answer Take a look on the corresponding data sheet, there is a breakdown of the LED status.  It usually indicates that there is a problem on their side, not a product problem.

LIGHT LEVEL & OCCUPANCY

OC
Question
The output will not switch off.
Answer There must be no moving heat, this is how it detects movement.

POWER SUPPLIES

PM-CS
Question
What one do I need to go into a DI of my BMS?
Answer The 01 and 02 versions are for this type of application.  The 03 is ONLY for using to switch a load directly i.e. a lamp or some other kind of load.  This has a triac switch and needs a load the others are VFC (volt free contact)
Question I want a fixed set point type, split core but my load I want to monitor is only 0.1A.  What can I do?
Answer You can pass the conductors though the switch multiple times.  If you pass this though four times it will think that the load is 0.4A so then it will switch as its then over the minimum which is 0.25A.

PRESSURE

PA-699
Question I want a 0-10Vdc output, can I select this on site?
Answer
No, you must add a suffix onto the part code “-V” to have a 0-10Vdc output.  Without this the output is 4-20mA
PA-699, PA-6P, PA-65 & PA-267
Question
Can this measure static pressure?
Answer
Yes, connected the high port to the duct and leave the low open to atmosphere.  If mounted outside, make sure that the static connection isn’t influenced by the wind.  Run a section of the PCV tubing to a sheltered location if required.
PL-PSA
Question
How do you use the set point and differential if using for falling pressure?
Answer
As this is designed for rising pressure you need to set this slightly differently.  I will use the PL-PSA-2 as an example:
Switching point 1 bar, differential 0.2 bar
Set the set point to 1.2 bar and differential to 0.2 bar.  When pressure then drops below 1 bar (set point - differential) the switch will change over.  Not till pressure then increases to >1.2 bar the switch will then change the other way.
General note None of the PL range can be used in oil applications.  Special versions are available, deliver typically around 3 to 4 weeks.
PL-52x
Question There is water coming out of the electrical connection when I opened it to the system.
Answer This is due to a pressure spike, they possibly used a ¼ turn lever valve, no matter how slowly you open these they do create a huge pressure.  Best to use a gate valve where pressure will be applied more slowly.
Question
Can we use this for natural gas (town gas)?
Answer It isn’t certified for use with natural gas, we recommend that the PL-680 is used instead.  You will find this on NAV and the data sheet is in the PL section on Web Datasheets.  This is quite expensive, net price (no discount).  The reason for using this is its intrinsically safe, if you have a spark from the electronic components this could ignite the gas, not a good idea.  Intrinsically safe products have a barrier to stop this from happening.
General note None of the PL range can be used in oil applications.  Special versions are available, deliver typically around 3 to 4 weeks.
PL-630-A
Question
Can I mount this horizontally?
Answer This is the same for all the range, the mounting position can be in any orientation, there is no preference.
General note None of the PL range can be used in oil applications.  Special versions are available, deliver typically around 3 to 4 weeks.

HUMIDITY

General note None of our humidity sensors are not suitable for swimming pool or spa applications.  The chemicals used to treat the water will eventually corrode the humidity element and cause oxidation on the PCB.  Typically, they last just a few months before failing.

TEMPERATURE

TT-512
Question Do you do these in any other finishes?
Answer
Contact technical support.
TT-518
Question
Do you do these in other finishes?
Answer
No, but we can free issue the thimble shell for you to get custom coloured, return and we will finish off the build.
Question
Can I take the thimble apart?
Answer No, it’s not impossible but a big possibility that the sensor will be damaged during dismantling.
TT-515
Question Do you do these with a set point adjust?
Answer
Yes, but it is a UI-500 and need to be ordered as such, contact technical support. 
TT-DA (TT-325)
Question
Can we get a custom length?
Answer Yes, definitely we can do any length up to 15 meters.
TT-TDA (TT-626)
Question Can we get a custom length?
Answer No sorry, only available at 2 meters.
TT-O (TT-331) & TT-OR (TT-332)
Question Which one do I use on a south facing wall?
Answer The TT-OR will offer protection from direct sunlight, it will not totally protect it but will be far better than the TT-O.  Its far better to find a north facing wall if possible or another sheltered location out of the sun.
TT-D (TT-341)
Question Can this be used in a steam application?
Answer
No, the maximum temperature that this can be used to monitor is 100˚C.  Temperatures higher than this use the TT-IH (TT-342).
Question
Do you do longer lengths?
Answer
No, just 3 standard lengths 65, 150 & 250mm.  We do also have 100mm, these are not published.
TT-C (TT-351) & TT-CD (TT-359)
Question
Is this shipped with a clamp to secure it to the pipe?
Answer Yes, a metal band suitable for a maximum pipe diameter of 5”
Question
Do you have an option for larger pipe?
Answer
Yes, you can join 2 or more bands together to form a larger one.  Contact sales for part number and cost. 
TT-S (TT-1000)
Question
Can I have fan speed on its own as an option?
Answer No, there are restrictions on options:
- SP Only
- MS Only
- SP & MS
- SP & FS
- SP, FS & MS
Question I would like a display
Answer No problem, but will have to use the ATC version as this is needed to power the display
Question but I would like a resistive output for temperature
Answer We can do this, it’s a special and adds a small charge to the overal sales price. 
General note Thermistors, Drayton have two types of BMS (Building Management System)               DC1100 (uses the -P) and DC1400 (uses the -H)
Question How do I select the right thermistor?  
Answer Using our thermistor type and compatibility chart at www.sontay.com/support we have listed a large number of the BMS manufacturers with associated thermistor types, if in any doubt contact Technical Support and they can guide you.  
UI-AA-1-F
Question How do I connect an alarm input into this?
Answer For a VFC (Volt Free Contact) this is between 0V and LOOP, not IN as you would expect.  A long historical error on the screen print but we have left this as it is.
Question Can I have additional engraving or different plate material?
Answer
Yes, this then becomes a UI-500, contact technical support. 

VALVES & ACTUATORS

VA
Question
Can I mount this outside?
Answer No, the IP rating isn’t high enough.  External mounting should be minimum of IP65 these are only IP54.
VR-G/F
Question I have an old valve but need a new motor (actuator)
Answer Its best to ask for a photo of what they have on site, this way we can identify if a new linkage kit is required.  The older valves and motors were a different size, we can usually supply a new linkage
VZ
Question The valve isn’t closing correctly
Answer This is usually due to the DP (Differential Pressure) exceeding the maximum quoted on the data sheet.  These generally can only be used on lower pressure systems

WATER DETECTION & EMERGENCY PRODUCTS

EP-KL/EP-FS
Question Can you supply new keys?
Answer Sorry, no we do have spare keys, they would have to purchase new products
EP-FS
Question Can I have different legends on the switch positions?
Answer
Sorry, no it’s not possible to change these
WD-RS
Question
Can this be connected directly to a DI (Digital Input)?
Answer No it MUST be connected to a WD-AMX.  This uses AC reference voltage, DI uses DC and will cause oxidation and eventual failure of the detector
WD-AMX
Question We would like to use 2 cable sensors can we do this?
Answer
Yes defiantly, you can connect as many cable and point sensors as you wish.  The only restriction is the cable run maximum is 200 meters.  The more sensors you add though the more searching f it alarms, as it’s a common alarm
Question Can I use the WD-AMX range of products to detect an oil leak?
Answer No, this will only work with water.
WD-CS
Question
How does it work?
Answer
The yellow and black twisted pair are actually the carrier for the leak detection cables.  Look closely and you will see 2 exposed stainless steel wires wrapped around the outside of these.  Water then comes into contact with these and creates a short, which the WD-AMX sees and goes into alarm
WD-CPS
Question
How does this work?
Answer
Using a humidity and temperature sensor it calculates dew point, this is the point where the air can no longer hold the moisture and then turns into water
WD-CPS-UN
Question
How does this work?
Answer A humidity sensor is used, and when this is >85% the switch will activate.  This version doesn’t have an LED or sensitivity adjustment like the WD-CPS
WD-CPS-R
Question
How does this work?
Answer
This works very differently to the above 2 detectors, rather than going into alarm before condensation (water droplets) which is the best way to monitor chilled beams this activates when condensation has started.  The face of the detector is a bit like a WD-RS, water creates a short and this is picked up by the BMS DI input.  Once this has detected water it MUST be changed to reasons quoted on the WD-RS