ILX Lightwave LDT-5900 Series User Manual page 52

2
C H A P T E R
IC-I Sensors - When an IC-I sensor is selected, the LDT-5900 measures
temperature based on the current delivered by the sensor. An example of an
IC-I sensor is the Analog Devices AD590. This device delivers 1 A/K or
approximately 298 A at 25°C.
The (+) terminal of the transducer should be connected to the RT+ pin and the (-)
terminal should be connected to RT-. The RT+_SENSE and RT-_SENSE pins
should NOT be connected when using this device. The nominal slope for the
AD590 is 1 A/K and the offset is nominally 0 A but both can be adjusted to
calibrate your particular sensor by entering the PARAMETER/SENSOR menu.
The sensor will have approximately 9V across it at 25°C but will vary over the
temperature range.
In IC-I sensor mode, the LDT-5900 has a sensor current limit of 600 A
(approximately 325 °C).
IC-V Sensors - When an IC-V sensor is selected, the LDT-5900 measures
temperature based on the voltage delivered by the sensor. An example of an IC-
V sensor is the National Semiconductor LM335A. This device delivers 10mV/K or
approximately 2.98V at 25°C.
The (+) terminal of the transducer should be connected to the RT+ pin and the (-)
terminal should be connected to RT-. The RT+_SENSE and RT-_SENSE pins
should NOT be connected when using this device. The nominal slope for the
LM335A is 10mV/K and the offset is nominally 0mV but both can be adjusted to
calibrate your particular sensor by entering the PARAMETER/SENSOR menu.
The sensor will have approximately 1mA of current through it at all times.
In IC-V sensor mode, the LDT-5900 has a sensor voltage limit of 6V (525.00 °C).
RTD Sensors - When an RTD sensor is selected, the LDT-5900 measures
temperature based on the resistance. An example of an RTD sensor is the Xian
Diamond USA T2001SDL. This device has a positive slope and a nominal
resistance at 0 °C of 100 ohms.
Two wire RTDs should be connected across the RT+ and RT- pins, as well as
across the RT+_SENSE and RT-_SENSE pins. Three wire RTDs are connected
similarly to the two wire, except that the third wire is specifically dedicated to the
RT-_SENSE pin.
The resistance versus temperature function for typical platinum RTDs is
accurately modeled by the Callendar-Van Dusen equation, as shown below.
R
T
Where :
R
0
36
LDT-5980/ 5948
O P E R A T I O N S
Ba sic TEC Op era t ion Inst ruct ions
2
= R (1 + AT + BT + 100CT
0
= Resistance ( ) at 0°C
3 4
+CT )