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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.	-25	+25	m.Nm	0.2 m.Nm
VTI21-HVI	HVI Receiver Variant	Average Current	Average HVI Current seen by the VTI21 from input channel 1.	0	1500	mA	5mA
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-001	General Purpose AC sensing up to 1.5A RMS	Current	RMS current from VTI21 input channel 1.	0	2500	mA	25 mA
VTI21-ACS-020	General Purpose AC sensing up to 20A RMS	Current	RMS current from VTI21 input channel 1.	0	20	A	0.2 A
VTI21-UM71	UM71 Variant	Current	Current at selected center frequency.	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

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Peak magnitude of the positive portion of the HVI pulse signal5 mAPeak magnitude of the negative portion of the HVI pulse signal5 mA

Slave Channel	VTI21 Input Channel	Quantity	Description	Typical Range	Units	Suggested AoC
1 - ANA	1	Average HVI Current	The average RMS current Current of the positive and negative portion of the HVI pulse signalpulsed waveform	0 to 10001500	mA	5 15 mA
2 - ANA	1	Positive Peak	HVI Frequency	The frequency of pulses	0 to 10005	mA	Hz	0.1 Hz
3 - ANA	1	Negative Peak	Noise Current	The RMS current observed between pulses.	0 to 10001500	mA	5 15 mA
4 - ANA	1	Frequency	Frequency of the HVI pulse train	0 to 5	Hz	0.1 Hz
5	1	Total Current	Total RMS current seen by the VTI21 receiver	0 to 1000	mA	5 mA
6	2	Average Current	The average RMS current of the positive and negative portion of the HVI pulse signal	0 to 1000	mA	5 mA
7	2	Positive Peak	Peak magnitude of the positive portion of the HVI pulse signal	0 to 1000	mA	5 mA
8	2	Negative Peak	Peak magnitude of the negative portion of the HVI pulse signal	0 to 1000	mA	5 mA
9	2	Frequency	Frequency of the HVI pulse train	0 to 5	Hz	0.1 Hz
10	2	Total Current	Total RMS current seen by the transducer.	0 to 1000	mA	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

VTI21-ACS-001

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 2500	mA	5 mA
2	2	CH 2 Current	RMS current observed on Channel 2	0 to 2500	mA	5 mA
3	NA	Derived Current	RMS current derived for an unmonitored 3rd phase in a balanced three-phase system.	0 to 2500	mA	5 mA
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

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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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Key

4-20mA Sensor Tables

VTI21-ACS-001