The DTM20 distributed Seismic vibration transmitter-monitor provides a simple and cost-effective solution for monitoring “balance-of-plant” equipment. The DTM’s smart design is extremely reliable with redundancy in power supply inputs, 4-20mA outputs and relay outputs, as well as, a Modbus communication port. The DTM20 monitor can interface with almost any vibration sensor (accelerometer or velocity transducer). The DTM is fully digital and may be configured in the field or come pre-configured from the factory.

Specifications

Electrical

Power:

Redundant. Accept dual power input

20-30VDC        @150mA

Isolation: 1000VDC  power to signal conditioner circuit
 

Frequency Response (-3dB):

Nominal Frequency:

2 ~ 3KHz

Low Frequency:

0.5 ~ 100Hz

High Frequency:

10 – 20KHz (peak)

 Filters:

                     Low-pass filter (field programmable):

8-pole (160 dB per decade, 48 dB per octave)

100Hz to 10kHz, field programmed by CFG

                     High-pass filter (factory setting):

2-pole (40 dB per decade, 12 dB per octave)

4 options (0.5Hz,2Hz,10Hz,100Hz) or custom

Piezo Sensor Interface:

Sensitivity:

100mV/g

100mV/in/sec

4mV/um

or any sensitivity specified

Current Source

Nominal                   4mA@24VDC

Seismic Velocity Sensor Interface:

Sensitivity:

User specified for any vibration sensor

Software programmable
 

Accuracy:

Typical +/-1% FS

Maximum +/-2% F
 

Buffered Output:

Original vibration, un-filtered

Impedance:                            150Ω

Maximum cable distance:   300m (1000ft)

Sensitivity:                     same as the sensor

Local BNC connector

On line CM terminals

Overall Vibration output:

Up to two 4-20mA output

4-20mA(1):

Source. Output to controller.

Sharing signal ground

Maximum load resistance  500Ω

4-20mA(2):

Loop.  Loop powered by controller.

Galvanic isolation, 1000VDC

Power supply range: 16-30VDC

Maximum load resistance: 50*(Vs-16)

Where Vs is the loop power supply

Alarm Set point:

5 ~ 100% FS

Accuracy:

   ±0.1%.

Delay:           1~60s, according to 1 second increase, default is 3s

Relays:

Seal:             Epoxy.

Capacity:     0.2A/240VAC,

0.4A/110VAC

2.0A/24VDC, resistive load

Relay type: SPTD

Isolation:      1000VDC

Push Buttons:

SET:    System on-site calibration and alarm setting

+ :        Adjustment increment

- : Adjustment decrement

LED Machine Condition Indicator:

OK:      System OK indication

ALT:    Vibration over Alert level

DNG:   Vibration over Danger level

BYP:    System in BYPASS

TRX:    Digital transmission active

RESET/BYPASS

Trip-Multiply

Modbus RTU

Digital Condition Monitoring

Physical
 

Dimension:

Height:                 75mm (2.95″)

see figure below

Weight:                0.9lb (0.4kg)

Environmental

Temperature:

Operation:   -40℃  ~ +85℃.

Storage:       -50℃ ~ +100℃.

Humidity:          90% non-condensing.

Case:                Aluminum cast (copper free)