Technical FAQ's

No, insert the whole probe unless ducts too small and use the DPA (duct flange)

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)

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

It's difficult to 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.

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 accurate. 

Yes, but you may need to adjust the sensitivity sprint to counterbalance the weight of the paddle.

The FS range of products are not WRAS approved. We have not put these forward for certification for use with drinking water.

No the 4 paddles are supplied with the product, suitable for pipe from 1” up to 8”.

The FS range of products are not WRAS approved. We have not put these forward for certification for use with drinking water.

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

The LS range of products are not WRAS approved.

The LS-CAP1 is for conducting liquids, water for example and the LS-CAP2 is for non-conducting liquids like oil.

No! and we do not do custom lengths.

The LS range of products are not WRAS approved.

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.

The LS range of products are not WRAS approved.

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).

The LS range of products are not WRAS approved.

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. 

The LS range of products are not WRAS approved. 

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.

No, you will need to buy the GS-CO2 sensor for this.

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.

Not really, the speed of response will be compromised.  The housing is designed to allow the air to naturally convert over the CO2 module.

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.

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.

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.

The recommended levels quoted by the HSE:

Short term exposure: 15 minutes at 100ppm

Long term exposure: 8 hours 20ppm

Although you must check with local H&S officials. 

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

Yes, you can.  But you can for example only have 2 sensors on the 2-channel version you cannot daisy chain more.

No, you must use this range of sensors with the GL-CO-RFG range of controllers.

No, the maximum duct size is 450mm

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.

No, single phase only up to 10A. 3-Phase motors are usually controlled by a device called an inverter drive.

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).

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

Yes, without this then the electronica circuit isn’t enabled and therefore won’t work.

That’s correct, control is only done via 2-phases

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.

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.

Yes it will of vice versa.

No this is single channel (will only convert one signal)

Definitely.

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

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

There must be no moving heat, this is how it detects movement.

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)

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

No, you must add a suffix onto the part code “-V” to have a 0-10Vdc output.  Without this the output is 4-20mA

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.

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.

None of the PL range can be used in oil applications.  Special versions are available, deliver typically around 3 to 4 weeks.

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.

Our PL-52X range isn’t suited for natural gas, we recommend that the PL-680 is used instead. The reason for using this is its intrinsically safe, if you have a spark from the electronic components this could ignite the gas. Intrinsically safe products have a barrier to stop this from happening.

None of the PL range can be used in oil applications.  Special versions are available, delivery is typically around 3 to 4 weeks.

This is the same for all the range, the mounting position can be in any orientation, there is no preference.

None of the PL range can be used in oil applications.  Special versions are available, deliver typically around 3 to 4 weeks.

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.

Contact technical support

No, but we can free issue the thimble shell for you to get custom coloured, return and we will finish off the build

No, it’s not impossible but a big possibility that the sensor will be damaged during dismantling.

Yes, but it is a UI-500 and need to be ordered as such, contact technical support.

Yes, definitely we can do any length up to 15 meters.

No sorry, only available at 2 meters

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

No, the maximum temperature that this can be used to monitor is 100˚C.  Temperatures higher than this use the TT-IH (TT-342)

No, just 3 standard lengths 65, 150 & 250mm.  We do also have 100mm, these are not published.

Yes, a metal band suitable for a maximum pipe diameter of 5”

Yes, you can join 2 or more bands together to form a larger one.  Contact sales for part number and cost.

No, there are restrictions on options:
- SP Only
- MS Only
- SP & MS
- SP & FS
- SP, FS & MS

No problem, but will have to use the ATC version as this is needed to power the display

We can do this, it’s a special and adds a small charge to the overal sales price.

Thermistors, Drayton have two types of BMS (Building Management System) DC1100 (uses the -P) and DC1400 (uses the -H)

Using our thermistor type and compatibility chart below 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.

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.

Yes, this then becomes a UI-500, contact technical support

No, the IP rating isn’t high enough.  External mounting should be minimum of IP65 these are only IP54.

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

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

Sorry, no we do have spare keys, they would have to purchase new products

Sorry, no it’s not possible to change these

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

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

No, this will only work with water.

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

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

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

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