Page Comparison

4-20mA Sensor Tables

Part No.	Variant Description	Quantity	Quantity Description	Value @ 20mA	Units	Suggested AoC
VTI21-VT1	AC Vane Relay Variant	Torque	Instantaneous Torque Exerted on the relay vane.	+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.	600	mA	15 mA
VTI21-TI21	TI21 / EbiTrack 200 Variant	Average Current	Average of upper and lower sideband current from VTI21 input channel 1.	1500	mA	5 mA
VTI21-FS25	FS2500 Receiver Variant	Center Current	Amplitude of the FS2500 center frequency current from VTI21 input channel 1.	1500	mA	5 mA
VTI21-FS26	FS2600 Receiver Variant	Center Current	Amplitude of the FS2500 center frequency current from VTI21 input channel 1.	1500	mA	5 mA
VTI21-ACS-001	General Purpose AC sensing up to 1.5A RMS	Current	RMS current from VTI21 input channel 1.	2500	mA	25 mA
VTI21-ACS-020	General Purpose AC sensing up to 20A RMS	Current	RMS current from VTI21 input channel 1.	20	A	0.2 A
VTI21-UM71	UM71 Variant	Current	Current at selected center frequency.	5000	µA	100µA
VTI21-ASTER	Aster Variant	Current	Current at selected center frequency.	5000	µA	100µA
VTI21-REED	Reed Relay Variant	Current	Current measured across the Reed relay frequency range on input channel 1.	5000	mA	100mA

VTI21-

...

RFDM

Reed Relay FDM variant

n/a

none

Slave Channel	Quantity	Description	Typical Range	Units	Suggested AoC
1	Torque	Instantaneous torque exerted on the relay vane	-25 to +25	m.Nm	0.2 m.Nm
2	Phase	Phase angle between local coil and control coil currents	0 to 180	Degrees	2 degrees
3	Local Current	RMS current in the local coil	0 to 500	mA	5 mA
4	Control Current	RMS current in the track coil	0 to 1000	mA	5 mA
5	Chatter	Degree of chatter	0 to 100	%	5 %

...

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

...

Slave Channel	VTI21 Input Channel	Quantity	Description	Typical Range	Units	Suggested AoC Threshold
1	1	Lock-on Frequency	Ideal operating frequency track circuit	1700 to 2600	Hz	1
2	1	In-band Current	RMS current in the operating band	0-5000	uA	50
3	1	Principle Frequency	Loudest frequency observed (actual operating frequency)	1700 to 2600	Hz	1
4	1	Total Current	broad-and RMS current	0-5000	uA	50
5	1	1700 Hz Band Current	RMS current in the 1700 Hz band	0-5000	uA	50
6	1	2000 Hz Band Current	RMS current in the 1900 Hz band	0-5000	uA	50
7	1	2300 Hz Band Current	RMS current in the 2100 Hz band	0-5000	uA	50
8	1	2600 Hz Band Current	RMS current in the 2300 Hz band	0-5000	uA	50
9	1	Gain / FFT	Pre-amp Gain as AoC, Spectrogram is acquired as a triggered capture	10	Hz	NA
10	2	Lock-on Frequency	Ideal operating frequency track circuit	1700 to 2600	Hz	1
11	2	In-band Current	RMS current in the operating band	0-5000	uA	50
12	2	Principle Frequency	Loudest frequency observed (actual operating frequency)	1700 to 2600	Hz	1
13	2	Total Current	broad-and RMS current	0-5000	uA	50
14	2	1700 Hz Band Current	RMS current in the 1700 Hz band	0-5000	uA	50
15	2	2000 Hz Band Current	RMS current in the 1900 Hz band	0-5000	uA	50
16	2	2300 Hz Band Current	RMS current in the 2100 Hz band	0-5000	uA	50
17	2	2600 Hz Band Current	RMS current in the 2300 Hz band	0-5000	uA	50
118	2	Gain / FFT	Pre-amp Gain as AoC, Spectrogram is acquired as a triggered capture	10	Hz	NA

VTI21-RFDM

note: only one input channel is supported.

Slave Channel	VTI21 Input Channel	Quantity	Description	Typical Range	Units	Suggested AoC
1	1	Frequency	Simple Frequency Measurement (zero crossings)	0-1000	Hz	50
2	1	Total Current	Total current measured in the reed relay frequency range	0-5A	mA	100
3	1	FFT	FFT for each monitored Channel		Hz	NA
4	1	channel 4	Energy at 803.25Hz	0-5A	mA	100
5	1	channel 16	Energy at 702.5Hz	0-5A	mA	100
6	1	channel 17	Energy at 697.5Hz	0-5A	mA	100
7	1	channel 19	Energy at 687Hz	0-5A	mA	100
8	1	channel 20	Energy at 682.5Hz	0-5A	mA	100
9	1	channel 26	Energy at 611.75Hz	0-5A	mA	100
10	1	channel 27	Energy at 607.75Hz	0-5A	mA	100
11	1	channel 36	Energy at 505Hz	0-5A	mA	100
12	1	channel 38	Energy at 493.5Hz	0-5A	mA	100
13	1	channel 39	Energy at 488Hz	0-5A	mA	100
14	1	channel 47	Energy at 419.75Hz	0-5A	mA	100
15	1	channel 48	Energy at 410.25Hz	0-5A	mA	100
16	1	channel 83	Energy at 446Hz	0-5A	mA	100
17	1	channel 84	533.75Hz	0-5A	mA	100
18	1	channel 92	Energy at 842Hz	0-5A	mA	100