Take a look at http://www.desin.com/english/principal.html
I have used PROGRAMMABLE INDICATOR LS-3200 for pressure and temperature. It works with serial COM RS-485 and Modbus.
However I don't know the price (I didn't bought)
Hope this help you
> -----Mensaje original-----
> De: STREET,ANDY (A-England,ex2) [mailto:andy_street@agilent.com]
> Enviado el: viernes, 26 de marzo de 2004 12:57
> Para: VRF
> Asunto: [vrf] Temperature sensors
>
>
> Hello vrf,
>
> Can anyone recommend a low cost temperature sensor to
> interface into VEE? Ideally what I am looking for a sensor that:
> * Operates over +10 deg C to +40 deg C
> * Accuracy +/- 0.5 deg C
> * Interface: ideally USB but can live with RS-232
> * Software interface: dll or COM that I can work with in VEE
> * Reading rates: slow - I only need to poll once every few
> seconds or so
>
> Many thanks
>
> Andy
>
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Acquisition Switch Unit with Resistive Thermal Devices, you select which.
Reasoning, RTDs can be connected such that a four wire resistance measure
can be taken. This will eliminate the worry of the length of wire, etc.
Also with RTDs it is possible to get them as small as a postage stamp or
smaller and they can be epoxied into hard to get at locations.
So the way I see it, one may obtain a very general purpose instrument with
multiple uses and get laboratory style temperature measurements. To me, for
the overall project, I save, either in a high volume environment or "oncies
and twocies" in a lab.
If you want to lessen the cost of instrumentation, any 4 wire resistive
measure instrument will do. You will need the data sheet of the RTDs in
order to return a temperature for each resistive reading and taking into
account linearity within VEE.
Rufus
-----Original Message-----
From: STREET,ANDY (A-England,ex2) [mailto:andy_street@agilent.com]
Sent: Friday, March 26, 2004 6:57 AM
To: VRF
Subject: [vrf] Temperature sensors
Hello vrf,
Can anyone recommend a low cost temperature sensor to interface into VEE?
Ideally what I am looking for a sensor that:
* Operates over +10 deg C to +40 deg C
* Accuracy +/- 0.5 deg C
* Interface: ideally USB but can live with RS-232
* Software interface: dll or COM that I can work with in VEE
* Reading rates: slow - I only need to poll once every few seconds or so
Many thanks
Andy
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