Page Comparison

4-20mA Sensor Tables

Part No.	Variant Description	Quantity	Quantity Description	Value @ 4mA	Value @ 20mA	Units	Suggested AoC
VTI21-VT1	AC Vane Relay Variant	Torque	Instantaneous Torque Exerted on the relay vane.	0	+25	m.Nm	0.2 m.Nm
VTI21-HVI	HVI Receiver Variant	Average Current	Average HVI Pulsed Current seen by the VTI21 from input channel 1.	0	600	mA	15 mA
VTI21-TI21	TI21 / EbiTrack 200 Variant	Average Current	Average of upper and lower sideband current from VTI21 input channel 1.	0	1500	mA	5 mA
VTI21-FS25	FS2500 Receiver Variant	Center Current	Amplitude of the FS2500 center frequency current from VTI21 input channel 1.	0	1500	mA	5 mA
VTI21-FS26	FS2600 Receiver Variant	Center Current	Amplitude of the FS2500 center frequency current from VTI21 input channel 1.	0	1500	mA	5 mA
VTI21-ACS	General Purpose AC sensing up to 20A 25A RMS	Current	RMS current from VTI21 input channel 1.	0	2025	A	0.2 A
VTI21-UM71	UM71 Variant	Current	Current at selected center frequency from VTi21 input channel 1.	0	5000	µA	100µA
VTI21-ASTER	Aster Variant	Current	Current at selected center frequency from VTi21 input channel 1.	0	5000	µA	100µA
VTI21-REED	Reed Relay Variant	Current	Current measured across the Reed relay frequency range on input channel 1.	0	5000	mA	100mA
VTI21-RFDM	Reed Relay FDM variant	n/a	none

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Slave Channel	VTI21 Input Channel	Quantity	Description	Typical Range	Units	Suggested AoC
1 - ANA	1	HVI Current	RMS Current of the pulsed waveform	0 to 1500	mA	15 mA
2 - ANA	1	HVI Frequency	The frequency of pulses	0 to 5	Hz	0.1 Hz
3 - ANA	1	Noise Current	The RMS current observed between pulses.	0 to 1500	mA	15 mA
4 - ANA	1	Pulse Waveform	If this channel is requested as a capture, the VTi21 will return a high-resolution waveform of the last observed pulse	0 to 1500	mA	Triggered Capture
1 - DIG	1	Pulse Conflict	Set TRUE if pulses are observed to be bleeding through from adjacent track sections	Digital	NA	On Change
5 - ANA	2	HVI Current	RMS Current of the pulsed waveform	0 to 1500	mA	15 mA
6 - ANA	2	HVI Frequency	The frequency of pulses	0 to 5	Hz	0.1 Hz
7 - ANA	2	Noise Current	The RMS current observed between pulses.	0 to 1500	mA	15 mA
8 - ANA	2	Pulse Waveform	If this channel is requested as a capture, the VTi21 will return a high-resolution waveform of the last observed pulse	0 to 1500	mA	Triggered Capture
2 - DIG	2	Pulse Conflict	Set TRUE if pulses are observed to be bleeding through from adjacent track sections	Digital	NA	On Change

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Slave Channel	VTI21 Input Channel	Quantity	Description	Typical Range	Units	Suggested AoC
1	1	CH 1 Current	RMS current observed on Channel 1	0 to 20	A	0.2 A
2	2	CH 2 Current	RMS current observed on Channel 2	0 to 20	A	0.2 A
3	NA	Derived Current	RMS current derived for an unmonitored 3rd phase in a balanced three-phase system.	0 to 20	A	0.2 A
4	NA	CH1 Leads CH2	Digital Output - TRUE if the waveform on CH1 is observed to lead that of CH2	TRUE or FALSE	NA	NA
5	NA	CH1 Lags CH2	Digital Output - TRUE if the waveform on CH1 is observed to lag that of CH2	TRUE or FALSE	NA	NA2	CH 2 Average Current	Average RMS current observed on Channel 2, over one second period.	0 to 25	A	0.2 A

VTI21-UM71

Slave Channel	VTI21 Input Channel	Quantity	Description	Typical Range	Units	Suggested AoC
1	1	CH 1 Frequency	Channel 1 Frequency Selected	1700 to 2600	Hz	1
2	1	CH 1 Side Band Ratio	Ratio of lower to upper frequency (0%=all lower, 100%=all upper)	0 to 100%	%	5
3	1	CH 1 Raw Frequency	Simple Frequency Measurement (zero crossings)	1600 to 2700	Hz	100
4	1	CH 1 Total Current	Total current in the UM71 band	0 to 5mA	µA	100
5	1	CH 1 current 1700Hz	Current measured at 1700Hz	0 to 5mA	µA	100
6	1	CH 1 current 2000Hz	Current measured at 2000Hz	0 to 5mA	µA	100
7	1	CH 1 current 2300Hz	Current measured at 2300Hz	0 to 5mA	µA	100
8	1	CH 1 current 2600Hz	Current measured at 2600Hz	0 to 5mA	µA	100
9	1	CH 1 Spectrogram or Gain	Capture waveform showing the magnitude spectrum of the input signal. Use a "Triggered Capture" to acquire the Spectrogram.	1 to 32		1
10	2	CH 2 Frequency	Channel 1 Frequency Selected	1700 to 2600	Hz	1
11	2	CH 2 Side Band Ratio	Ratio of lower to upper frequency (0%=all lower, 100%=all upper)	0 to 100%	%	5
12	2	CH 2 Raw Frequency	Simple Frequency Measurement (zero crossings)	1600 to 2700	Hz	100
13	2	CH 2 Total Current	Total current in the UM71 band	0 to 5mA	µA	100
14	2	CH 2 current 1700Hz	Current measured at 1700Hz	0 to 5mA	µA	100
15	2	CH 2 current 2000Hz	Current measured at 2000Hz	0 to 5mA	µA	100
16	2	CH 2 current 2300Hz	Current measured at 2300Hz	0 to 5mA	µA	100
17	2	CH 2 current 2600Hz	Current measured at 2600Hz	0 to 5mA	µA	100
18	2	CH 2 Spectrogram or Gain	Capture waveform showing the magnitude spectrum of the input signal. Use a "Triggered Capture" to acquire the Spectrogram.	1 to 32		1

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Slave Channel	VTI21 Input Channel	Quantity	Description	Typical Range	Units	Suggested AoC
1	1	CH 1 Current	RMS current observed on Channel 1 (output at 100 Hz, low pass filtered with cutoff of 9 Hz)	0 to 250025	mA	A	0.2 A
22	1	CH	1 Average Current	Average RMS current observed on Channel 21, over one second period.	0 to	25	mA	5 mAA	0.2 A
3	NA2	Derived CH 2 Current	RMS current derived for an unmonitored 3rd phase in a balanced three-phase system. observed on Channel 2 (output at 100 Hz, low pass filtered with cutoff of 9 Hz)	0 to 250025	mA	A	0.2 A
4	NA	CH1 Leads CH2	Digital Output - TRUE if the waveform on CH1 is observed to lead that of CH2	TRUE or FALSE	NA	NA
5	NA	CH1 Lags CH2	Digital Output - TRUE if the waveform on CH1 is observed to lag that of CH2	TRUE or FALSE	NA	NA