janner_10
Lifetime Supporting Member
Background:
We have a customer that wants to start measuring the Oxygen content of syngas. All quite straight forward using a NGK Lambda Sensor. Bearing in mind, we aren't doing any wiring as the plant is in the States and we are in the UK, we are just adding the software remotely to their / our existing system.
We will be measuring the output in mV from the sensor (into a 1769-IF8U) and then scaling to Oxygen content. The output from the sensor will be roughly -6 mV to +30mV for their application.
Problem:
The distance between the sensor and the Analogue Input module, is roughly 25m to 30m.
My proposal to the customer is to invest in a signal conditioner local to the sensor to convert mV to mA and then read this at the PLC.
Naturally he knows best and just thinks that we can read mV in the range above on a cable run of 30m.
I think it is practically impossible due to the volt drop and such a small value to read, he doesn't.
Any thoughts?
We have a customer that wants to start measuring the Oxygen content of syngas. All quite straight forward using a NGK Lambda Sensor. Bearing in mind, we aren't doing any wiring as the plant is in the States and we are in the UK, we are just adding the software remotely to their / our existing system.
We will be measuring the output in mV from the sensor (into a 1769-IF8U) and then scaling to Oxygen content. The output from the sensor will be roughly -6 mV to +30mV for their application.
Problem:
The distance between the sensor and the Analogue Input module, is roughly 25m to 30m.
My proposal to the customer is to invest in a signal conditioner local to the sensor to convert mV to mA and then read this at the PLC.
Naturally he knows best and just thinks that we can read mV in the range above on a cable run of 30m.
I think it is practically impossible due to the volt drop and such a small value to read, he doesn't.
Any thoughts?