Robertshaw 570B Series, 570B-A, 570B-B, 570B-C, 570B-D User Manual

Industrial Products Division

Model 570B Series

T wo-wir e Vibration Sensor

SPECIFICATIONS

Robertshaw Industrial Products Division
1602 Mustang Drive
Maryville, Tennessee 37801 Telephone:
[phone]
Fax: [phone]

FEATURES:

• Corrosion resistant

• ESD protection

• Reverse wiring protection

• Overload protection

• Hermetic

• No trim pots

2 pin
connector

1 1/16" hex

2.80"

2.12"

DYNAMIC

Output (±5% of Full Scale) ............................................. 4-20 mA DC

Vibration Range ............................................................. see table below

Frequency Response:

–3 dB ..................................................................... see table below

Repeatability .................................................................. ±2%

Resonant Frequency, mounted, nominal ....................... see table below

Transverse Sensitivity, max. .......................................... 5%

ELECTRICAL

Power Requirements (Two wire loop power):

voltage source........................................................ 10 VDC - 30 VDC

Loop Resistance

1

at 24 VDC, maximum........................ 700Ω

Turn on Time.................................................................. <30 seconds

Grounding ...................................................................... Case isolated, internally

shielded

ENVIRONMENTAL

Temperature Range....................................................... –40 to 85 °C

Vibration Limit ................................................................ 250 g peak

Shock Limit .................................................................... 2,500 g peak

Electromagnetic Sensitivity, equiv. g ............................. 10 µg/gauss

Sealing ........................................................................... hermetic, NEMA 4X, IP68

PHYSICAL

Weight............................................................................ 162 grams

Sensing Element Design................................................ PZT ceramic / shear

Case Material................................................................. 316L stainless steel

Mounting ........................................................................ 1/4 - 28 tapped hole

Output Connector........................................................... 2-pin, MIL-C-5015 style

Pin A ............................................... plus (+) White

Pin B .............................................minus (–) Black

2

Cabling

......................................................................... Two conductor shielded

(See Table 1 on back)

Torque Limit................................................................... 30 in lbs. max

Warranty ........................................................................ 1 year

1/4-28

Model 570

1.12"

Typical Circuit

Pin A

+

Pin B

–

Signal Measuring Circuit

R

LOAD

mounting hole

+
DC Power

Supply

–

Due to continued research and development, the Manufacturer reserves the right to amend these specifications without notice.

NOTES:

1

Maximum loop resistance can be calculated by:

Typical

RL (max) = -------------------------

Vpower – 10 V
20 mA

Loop resistance is the sum of wiring
resistance and the load resistor.

2

Cable resistance equals 40 ohms, total per 1000 ft.

Power Source RL max

Voltage

20 500
24 700
26 800

ACCESSORIES SUPPLIED: 1/4-28 mounting stud.

Model Mode Range Frequency Resonant

Response Frequency

570B-A acceleration 0 - 5 g peak 2 Hz - 2 kHz 28 kHz
570B-B acceleration 0 - 10 g peak 2 Hz - 2 kHz 28 kHz
570B-C acceleration 0 - 20 g peak 2 Hz - 2 kHz 28 kHz
570B-D velocity 0 - 0.5 IPS peak 2 Hz - 2 kHz 28 kHz
570B-E velocity 0 - 1 IPS peak 2 Hz - 2 kHz 28 kHz
570B-F velocity 0 - 2 IPS peak 2 Hz - 2 kHz 28 kHz

TABLE

98549 Rev.G.1 1/04

Mounting Instructions

The mounting point on the structure should be faced to a
diameter of 1.25 inches. For measurements involving
frequencies above 1 kHz, the surface should be flat within 1
mil and have surface texture no greater than 32 microinches.

The tapped hole must be perpendicular to the mounting
surface and at least two threads deeper than the stud. This will
prevent a gap between the sensor and the mounting surface–
producing optimum frequency response. (see Figure 1).

Proper screw torque on the mounting stud is also required.
Under-torquing the sensor reduces the stiffness of the
coupling. Over-torquing can cause permanent damage to the
sensor. It is recommended that 1/4-28 stud be torqued to a
maximum value of 30 inch-pounds.

Table 1: Cable versus Cable Length

Part Number NEMA 4X

Cable Length

086568A0016 16 Ft.
086568A0032 32 Ft.
086568A0064 64 Ft.
086568A0112 112 Ft.

Note: IP68 cable available by special order.

Cable Grounding and Ground Loops

In order to provide proper shielding and prevent ground
loops, cable grounding should be carefully considered.

Before stud mounting the sensor, a coupling fluid should be
applied to the mating surfaces. The coupling fluid protects the
mounting surface and optimizes the frequency response by
increasing the coupling stiffness. Suggested coupling fluids
are machine oil or vacuum grease. It is recommended that a
thread adhesive such as Loctite 222 be used.

—A—

.001

.35

Surface

Facing

.25

32

1.25" min.

.004

A

Figure 1: Stud Mounting: Surface Preparation

Cable Routing and Electromagnetic Interference

Walkie-talkies, power lines, or even electrical sparks may
cause signal interference. The following guidelines will
eliminate many measurement errors due to electromagnetic
radiation and electrostatic discharge (ESD).

Assure that high quality, well shielded cables are used. If
cable splices are made, complete shielding must be
maintained.

Proper cable routing is imperative. Never run sensor cable
alongside AC power lines; cables must cross AC power lines
at right angles. Where possible, provide a separate grounded
conduit to enclose the sensor cable. In addition, route the
cable away from radio transmission equipment, motors/
generators, and transformers. Finally, avoid routing the cable
through areas prone to ESD. Even though Robertshaw
sensors are protected against ESD failure, temporary
distortion signals may appear at the output.

For sensors using two conductor/shielded cable, the power is
carried on one lead and the return on the other. The cable
shield serves to protect the signal from ESD and
electromagnetic interference (EMI). The shield should be
grounded at only one point. Figure 2 shows a typical cable
connection scheme.

+

–

Readout

Equipment

Electronics

Internal Shield
Isolated from Housing

Figure 2: Multiconductor/Shield Configuration

Cable Anchoring

After mounting the sensor, the cable should be anchored to
reduce stress at the cable terminations. When securing the
cable, leave enough slack to allow free movement of the
sensor. Figure 3 shows a recommended cable anchoring
technique.

Allow 2 inches
minimum bend
radius

Cable

Clamp

Machine Surface

Figure 3: Cable Anchoring