Wiring
Standard Wiring
Contact Closure
(Digital) Inputs
The two digital contact closure inputs, between ground and DI 1 and ground and DI
2, provide the user with the ability to configure the detector to execute a command or
other function upon a user-provided contact opening or closing. A +3.3 V wetting
voltage (0.1 mA max) is provided for each discrete input.
Refer to the DensityPRO Measurement System User Guide (p/n 1-0702-016) for
details on assigning commands to the contact closure inputs.
Figure 4-15. Discrete Input Wiring (PS-PCA J7)
Temperature
Compensation
The DensityPRO measurement system’s temperature compensation circuitry utilizes a
3- or 4-wire, 100-ohm Platinum RTD. Each RTD wire has a maximum per wire
resistance of 1.0 ohm.
Refer to the connections in the figures below.
Figure 4-16. RTD, 3-wire Configuration (PS-PCA J3B)
Figure 4-17. RTD, 4-wire Configuration (PS-PCA J3B)
Thermo Scientific DensityPRO Installation Manual 4-11
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