Roosie

iTrader: (8)

Anyone know what sensors are compatible, im after a pressure sensor in 1/8npt fitting 0-10 bar there are a lot of sensor out there but not sure what are compatible?

wes

You want a 0-5v linear output sensor really (Pressure transducer), you can configure it as a custom sensor in the AIM software, usually something like 0.5v = 0 bar and 4.5v = 10 bar.

Roosie

iTrader: (8)

Hi Wes

yes ive been told a 0-5v will be ok.
are all sensors more or the same.

wes

Nope there are a lot of differences, you'll want a pressure transducer and not a pressure sensor, basically a pressure transducer will have 3 wires, V+, V-, and Vout, and will work without the need for any pull up resistors that you'll need if using a pressure sensor (like the VDO type). Also the VDO type aren't very accurate, accuracy is +/- 1 bar (so 10% on a 10 bar sensor!), where some pressure transducers can be +/- 0.5%

What are you measuring, and does it really need to be 10 bar? There are some good 7 bar pressure transducers out there which will give you much better resolution for oil / fuel pressure than a 10 bar item, of course if you are running more than 3.5 bar of boost with a base fuel pressure of 3.5 bar then yes a 10 bar item would be required!

I use these for oil and fuel pressure on my own car, they are 100psi / 6.9bar pressure transducers, accuracy +/- 0.5%, and come with un-terminated cabling so you can put your own weather-proof connections on rather than trying to find a weird connector:
http://www.digikey.co.uk/product-det...087-ND/1665849

Roosie

iTrader: (8)

That looks perfect, im really only using it for oil pressure!. you mention pull up resistors i have a problem with my ECU (Emerald) wont ready my Citroen standard vehicle speed sensor on the car (i think its a hall sensor type that runs off the drive shaft in the gearbox

I know the speed sensor is fine as i have a few of them, BUT the pulse that the sensor gives off is a pulsed earth and not a 12v etc. so there are 3 wires coming from sensor + , GND, Signal

obviously ive put the + and the Ground to the battery and the signel into ECU and its not reading nothing through the ecu at all.
In the Emerald Manual it mentioned some sensor need a pull up resistor or something along lines off. its really jaring me off probably not something you can help but how do i know if a sensor need a pull up resistor?

wes

You usually use a pull-up resistor when you have a resistance based sensor (like a cossie water / air temp or a VDO pressure sensor) that has 2 pins, and you have to calculate what pull-up resistor to use based on the voltage range you are putting in and the resistance range of the sensor you are working with. In this diagram the sensor would go where it is labelled "switch":



I wouldn't of thought that gear sensor wont need a pull-up resistor, i'm not sure if it likes 12v up it though! I've not used an emerald ecu before but usually you would use 5v (Vin, usually shared from the TPS + supply from the ECU), the negative (Ground) goes to the common sensor earth pin on the ecu, then the signal (Vout) will go to your 0-5v input on the ecu.

Roosie

iTrader: (8)

ahhhh think i put the negative onto the battery direct as i was testing it out do you think that will make a difference?
I ordered one of this sensors and it will be here tommorrow cant believe how quick, have you got pinout for the std binder connection onto this sensor? any settings in the dash setings i need to change to read the sensor ok?

wes

Yep it would make a difference, deffo needs to be attached to the common sensor ground pin for the ecu.

The pressure sensor gets wired into the 16pin AMP connector on the back of the MXL, I used Analog Channel 1 as my oil pressure input, so the white wire on the sensor goes to pin 8 (Analog Channel 1), the red wire goes to pin 6 (V Ref), and the black wire goes to pin 7 (Analog GND).

Then in the Race studio software you click the “Customize sensor” option and create a new sensor (input the data, click compute curve, then save it), once you save it it is available to choose in the channel setup:





The pressure transducer is really a 0-100psi item so I converted it to bar which is why it is set to 6.89 as the max and not 7.

Will Pedley Racing

I have the full range of AIM and other compatible sensors available in my web shop and can provide advice on what suits your requirements.

http://willpedleyracing.com/shop/34-...-0-10-bar.html

Hopefully that's what you're after