Page Comparison

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4-20mA Sensor Tables

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Part No.

...

Variant Description

...

Quantity

...

Quantity Description

...

Value @ 4mA

...

Value @ 20mA

...

Units

...

Suggested AoC

...

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

1500

600

mA

5mA

15 mA
VTI21-TI21-TX	TI21 / EbiTrack 200 Variant (TX)	Average Current	Average of upper and lower sideband current from VTI21 input channel 1.	0	5	A	0

1500

.05 A
VTI21-TI21-TX	TI21 / EbiTrack 200 Variant (RX)	Average Current	Average of upper and lower sideband current from VTI21 input channel 1.	0	200	mA

5

2 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

25A RMS

Current

RMS current from VTI21 input channel 1.

0

2500

25

mA25 mA

A	0.2 A
VTI21-

ACS-020General Purpose AC sensing up to 20A RMS

UM71

UM71 Variant

Current

RMS current from VTI21 input

Current at selected center frequency from VTi21 input channel 1.

0

20

5000

µA

0.2 A

100µA

VTI21-

UM71

ASTER

UM71

Aster Variant

Current

Current at selected center

frequency

frequency from VTi21 input channel 1.	0	5000	µA	100µA
VTI21-

Reed

REED

Reed Relay Variant

Current

Current measured across the Reed relay frequency range on input channel 1.

0

5000

mA

100mA

...

25mA

VTI21-

...

RFDM

Reed Relay FDM variant

n/a

none

RS485 Sensor Tables

VTI21-VT1

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 %

VTI21-TI21 / VTI21-FS25 / VTI21-FS26

Slave Channel

VTI21 Input Channel

Quantity

Description

Typical Range

Units

Suggested AoC

1

Center Frequency

The Center frequency, in hertz, of the track circuit.

388.8 to 508.8

Hz

1 Hz

2

1

	Center frequency Current	Total RMS current at the target center frequency	0 to 1000	mA	5 mA
3

1

	Lower Side Band current	Total RMS current at the target lower side band frequency	0 to 1000	mA	5 mA
4

1

Upper Side Band current	Total RMS current at the target upper side band frequency	0 to 1000	mA	5 mA
5

1

	In Band Current	Total RMS current seen by the transducer between 300 to 600 Hz	0 to 1000	mA	5 mA
6

1

Spectrogram

or Gain

Capture waveform showing the magnitude spectrum of the input signal. Use a "Triggered Capture" to acquire the Spectrogram.

When spectrum data is not being acquired, this channel shows the current amplifier gain setting

4.8 to 1228.8

Hz

NA

7

1

Loudest Frequency	The strongest frequency, in hertz, observed in the incoming waveform.	4.8 to 1228.8	Hz	1 Hz
8

1

Total Current

Total RMS current seen by the transducer.

0 to 1000

mA

5 mA

9

2

Center Frequency

The Center frequency, in hertz, of the track circuit.

388.8 to 508.8

Hz

1 Hz

10

2

	Center frequency Current	Total RMS current at the target center frequency	0 to 1000	mA	5 mA
11

2

	Lower Side Band current	Total RMS current at the target lower side band frequency	0 to 1000	mA	5 mA
12

2

	Upper Side Band current	Total RMS current at the target upper side band frequency	0 to 1000	mA	5 mA
13

2

In Band Current	Total RMS current seen by the transducer between 300 to 600 Hz	0 to 1000	mA	5 mA
14

2

Spectrogram

or Gain

Capture waveform showing the magnitude spectrum of the input signal. Use a "Triggered Capture" to acquire the Spectrogram.

When spectrum data is not being acquired, this channel shows the current amplifier gain setting

4.8 to 1228.8

Hz

NA

15

2

Loudest Frequency	The strongest frequency, in hertz, observed in the incoming waveform.	4.8 to 1228.8	Hz	1 Hz
16

2

Total Current

Total RMS current seen by the transducer.

0 to 1000

mA

5 mA

VTI21-HVI

Slave Channel

VTI21 Input Channel

Quantity

Description

Typical Range

Units

Suggested AoC

1 - ANA

1

Average Current

HVI Frequency

The

average RMS current of the positive and negative portion of the HVI pulse signal0 to 1000mA5 mA21Positive PeakPeak magnitude of the positive portion of the HVI pulse signal0 to 10000 to 1000

frequency of pulses	0 to 5	Hz	0.1 Hz
2 - ANA	HVI Current	RMS Current of the pulsed waveform	0 to 1500	mA	5 mA
3 - ANA

1Negative PeakPeak magnitude of the negative portion of the HVI pulse signal

Noise Current	The RMS current observed between pulses.	0 to 1500	mA	5 mA
4 - DIG

1FrequencyFrequency of the HVI pulse train0 to 5Hz0.1 Hz51Total CurrentTotal RMS current seen by the VTI21 receiver0 to 1000mA5 mA62Average CurrentThe average RMS current of the positive and negative portion of the HVI pulse signal0 to 1000mA5 mA72Positive PeakPeak magnitude of the positive portion of the HVI pulse signal0 to 1000mA5 mA82Negative PeakPeak magnitude of the negative portion of the HVI pulse signal0 to 1000mA5 mA92FrequencyFrequency of the HVI pulse trainTotal

Pulse Conflict	Set TRUE if pulses are observed to be bleeding through from adjacent track sections	Digital	N/A	On Change
5 - ANA	Rejection Rate	Proportion of pulses deemed not to be genuine HVI pulses	0 to 100	%	Don't push to server - for diagnostic use by Mpec only
6 - ANA	Rejection Reason	Bitfield encoding the reason a pulse was not accepted.	8 bits	N/A
7- ANA	Sensitivity	Threshold used to identify pulse events	0 to 2621440	N/A
8 - ANA	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
9 - ANA	2	HVI Frequency	The frequency of pulses	0 to 5	Hz	0.1 Hz
10 - ANA

2

HVI Current

Total

RMS

current seen by the transducer.

Current of the pulsed waveform

0 to

1000

1500

mA

5 mA

...

11 -

...

Slave Channel

VTI21 Input Channel

Quantity

Description

Typical Range

Units

Suggested AoC

11CH 1 CurrentRMS current observed on Channel 10 to 2500

ANA

Noise Current

The RMS current observed between pulses.

0 to 1500

mA

5 mA

22CH 2 CurrentRMS current observed on Channel 20 to 2500mA5 mA3NADerived CurrentRMS current derived for an unmonitored 3rd phase in a balanced three-phase system.0 to 2500mA5 mA4NACH1 Leads CH2Digital Output - TRUE if the waveform on CH1 is observed to lead that of CH2TRUE or FALSENANA5NACH1 Lags CH2Digital Output - TRUE if the waveform on CH1 is observed to lag that of CH2TRUE or FALSENANA

...

12 - DIG	Pulse Conflict	Set TRUE if pulses are observed to be bleeding through from adjacent track sections	Digital	N/A	On Change
13 - ANA	Rejection Rate	Proportion of pulses deemed not to be genuine HVI pulses	0 to 100	%	Don't push to server - for diagnostic use by Mpec only
14 - ANA	Rejection Reason	Bitfield encoding the reason a pulse was not accepted.	8 bits	N/A
15 - ANA	Sensitivity	Threshold used to identify pulse events	0 to 2621440	N/A
16 - ANA	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

VTI21-ACS

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

20

25	A	0.2 A
2

2

CH

2

1 Average Current

Average RMS current observed on Channel

2

1, over one second period.

0 to

20

25	A	0.2 A
3

NA

2

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

20

Slave Channel

VTI21 Input Channel

Quantity

Description

Typical

25	A	0.2 A
4

NACH1 Leads CH2Digital Output - TRUE if the waveform on CH1 is observed to lead that of CH2TRUE or FALSENANA5NACH1 Lags CH2Digital Output - TRUE if the waveform on CH1 is observed to lag that of CH2TRUE or FALSENANA

...

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

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

VTI21-Reed

Slave Channel	VTI21 Input Channel	Quantity	Description	Typical Range	Units	Suggested AoC

Slave Channel

VTI21 Input Channel

Quantity

Description

Typical Range

Units

Suggested AoC

1

CH 1 Frequency

Simple Frequency Measurement (zero crossings)

0 to 5000

Hz

1

2

1

CH 1 Total Current

Total current measured in the reed relay frequency range

0 to 5A

0 to 5000

mA

50

10

3

1

CH 1 - channel 211

Total Current at 363Hz

0 to 5A

0 to 5000

mA

50

10

4

1

CH 1 - channel 212

Total Current at 366Hz

0 to 5A

0 to 5000

mA

50

10

5

1

CH 1 - channel 213

Total Current at 369Hz

0 to 5A

0 to 5000

mA

50

10

6

1

CH 1 - channel 214

Total Current at 372Hz

0 to 5A

0 to 5000

mA

50

10

7

1

CH 1 - channel 215

Total Current at 375Hz

0 to 5A

0 to 5000

mA

50

10

8

1

CH 1 - channel 216

Total Current at 378Hz

0 to 5A

0 to 5000

mA

50

10

9

1

CH 1 - channel 217

Total Current at 381Hz

0 to 5A

0 to 5000

mA

50

10

1

CH 1 - channel 218

Total Current at 384Hz

0 to 5A

0 to 5000

mA

50

10

11

1

CH 1 - spectrogram / gain

Capture waveform showing the magnitude spectrum of the input signal. Use a "Triggered Capture" to acquire the Spectrogram. note: includes only measured frequencies, which are: 363, 366, 369, 372, 375, 378, 381, 384, 408, 417, 423Hz

12

2

CH 2 Frequency

Simple Frequency Measurement (zero crossings)

0 to 5000

Hz

1

13

2

CH 2 Total Current

Total current measured in the reed relay frequency range

0 to 5A

0 to 5000

mA

50

10

14

2

CH 2 - channel 211

Total Current at 363Hz

0 to 5A

0 to 5000

mA

50

10

15

2

CH 2 - channel 212

Total Current at 366Hz

0 to 5A

0 to 5000

mA

50

10

16

2

CH 2 - channel 213

Total Current at 369Hz

0 to 5A

0 to 5000

mA

50

10

17

2

CH 2 - channel 214

Total Current at 372Hz

0 to 5A

0 to 5000

mA

50

10

18

2

CH 2 - channel 215

Total Current at 375Hz

0 to 5A

0 to 5000

mA

50

10

19

2

CH 2 - channel 216

Total Current at 378Hz

0 to 5A

0 to 5000

mA

50

10

20

2

CH 2 - channel 217

Total Current at 381Hz

0 to 5A

0 to 5000

mA

50

10

21

2

CH 2 - channel 218

Total Current at 384Hz

0 to 5A

0 to 5000

mA

50

10

22

2

CH 2 - spectrogram / gain

Capture waveform showing the magnitude spectrum of the input signal. Use a "Triggered Capture" to acquire the Spectrogram. note: includes only measured frequencies, which are: 363, 366, 369, 372, 375, 378, 381, 384, 408, 417, 423Hz

Aster

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		In-band Current	RMS current in the operating band	0-5000	uA	50
3		Principle Frequency	Loudest frequency observed (actual operating frequency)	1700 to 2600	Hz	1
4		Total Current	broad-and RMS current	0-5000	uA	50
5		1700 Hz Band Current	RMS current in the 1700 Hz band	0-5000	uA	50
6		2000 Hz Band Current	RMS current in the 1900 Hz band	0-5000	uA	50
7		2300 Hz Band Current	RMS current in the 2100 Hz band	0-5000	uA	50
8		2600 Hz Band Current	RMS current in the 2300 Hz band	0-5000	uA	50
9		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		In-band Current	RMS current in the operating band	0-5000	uA	50
12		Principle Frequency	Loudest frequency observed (actual operating frequency)	1700 to 2600	Hz	1
13		Total Current	broad-and RMS current	0-5000	uA	50
14		1700 Hz Band Current	RMS current in the 1700 Hz band	0-5000	uA	50
15		2000 Hz Band Current	RMS current in the 1900 Hz band	0-5000	uA	50
16		2300 Hz Band Current	RMS current in the 2100 Hz band	0-5000	uA	50
17		2600 Hz Band Current	RMS current in the 2300 Hz band	0-5000	uA	50
118		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		Total Current	Total current measured in the reed relay frequency range	0-5A	mA	100
3		FFT	FFT for each monitored Channel		Hz	NA
4		channel 4	Energy at 803.25Hz	0-5A	mA	100
5		channel 16	Energy at 702.5Hz	0-5A	mA	100
6		channel 17	Energy at 697.5Hz	0-5A	mA	100
7		channel 19	Energy at 687Hz	0-5A	mA	100
8		channel 20	Energy at 682.5Hz	0-5A	mA	100
9		channel 26	Energy at 611.75Hz	0-5A	mA	100
10		channel 27	Energy at 607.75Hz	0-5A	mA	100
11		channel 36	Energy at 505Hz	0-5A	mA	100
12		channel 38	Energy at 493.5Hz	0-5A	mA	100
13		channel 39	Energy at 488Hz	0-5A	mA	100
14		channel 47	Energy at 419.75Hz	0-5A	mA	100
15		channel 48	Energy at 410.25Hz	0-5A	mA	100
16		channel 83	Energy at 446Hz	0-5A	mA	100
17		channel 84	Energy at 533.75Hz	0-5A	mA	100
18		channel 92	Energy at 842Hz	0-5A	mA	100

Versions Compared

Old Version 3

New Version Current

Key

4-20mA Sensor Tables

4-20mA Sensor Tables

RS485 Sensor Tables

VTI21-VT1

VTI21-TI21 / VTI21-FS25 / VTI21-FS26

VTI21-HVI

VTI21-ACS

VTI21-UM71