Hi again guys,
I have this system where I need to monitor/control 24 incubators.
Most have reasonnable Setpoints and margins of error, thing like 40°C± 2.0°C
The problem I have is that some of them have a Setpoint of 4°C while the margin of error (read diff. Alarms)is ±0.2°
This 0.2°C really bugs me.
I can have RTDs or even TCs with 0.1C resolution but the input modules for PLC add more error than I can live with.
My typical RTD would have a resolution of 0.089°C but the darn input cards don't match this.
Normaly its not a problem when we read something in the hundreds of degrees but at 2°C its BAD!
Do you guys know of converter modules (Ex: ModbusTCP) that can accept a 100 Ohm RTD (3 Wires) that are not crazyly expansive?
Know I'm at $350 a point for a 0.01 resolution and $200 for 1°C ...
What I need is a cheap way to read temperatur from -10 to +50 C ±0.01°C and bring it into a PC with a SCADA.
24 times.
Any suggestion is welcomed.
I have this system where I need to monitor/control 24 incubators.
Most have reasonnable Setpoints and margins of error, thing like 40°C± 2.0°C
The problem I have is that some of them have a Setpoint of 4°C while the margin of error (read diff. Alarms)is ±0.2°
This 0.2°C really bugs me.
I can have RTDs or even TCs with 0.1C resolution but the input modules for PLC add more error than I can live with.
My typical RTD would have a resolution of 0.089°C but the darn input cards don't match this.
Normaly its not a problem when we read something in the hundreds of degrees but at 2°C its BAD!
Do you guys know of converter modules (Ex: ModbusTCP) that can accept a 100 Ohm RTD (3 Wires) that are not crazyly expansive?
Know I'm at $350 a point for a 0.01 resolution and $200 for 1°C ...
What I need is a cheap way to read temperatur from -10 to +50 C ±0.01°C and bring it into a PC with a SCADA.
24 times.
Any suggestion is welcomed.