Robertshaw 570B Manuel du propriétaire

Avoid Catastrophic Failure

Protect your rotating or reciprocating

machinery, including pumps, motors, fans,

blowers, gear boxes, compressors, turbines

and other machinery from excessive vibration.

Vibration monitoring will alert you of

increasing machine vibration levels so

preventative maintenance can be scheduled

before catastrophic failures occur.

General Description

Robertshaw’s model 570B is a loop powered

(12 – 36 VDC) vibration transmitter that

provides a 4-20 mADC output proportionate

to vibration. The transmitter is available with

a variety of acceleration and velocity ranges.

This rugged (316L Stainless Steel, NEMA 4X,

IP68) compact unit provides continuous

monitoring of machine vibration for trending,

alarm and/or shutdown when used with a

PLC, computer, DCS, data logger or current

relays.

Installation is simple and no calibration is

required. A 1/4-28 tapped hole and a 1/4-28

stud is provided for mounting. The unit has a

2 pin connector and mates with a standard

MIL-C-5015 2 socket connector with splash-

proof boot for a weatherproof, splash-proof

connection. Optional cable assemblies are

available in lengths of 16, 32, 64 and 112 feet.

Sales Manual Section 140

Product Specification Model 570B

Loop Powered Stud Mount

Vibration Transmitter

Cable Sold Separately

Features and Benefits:

•Two wire loop powered (12 – 36 VDC)

•4 – 20 mADC output (isolated)

•Compact design, 1.12” diameter, 2.80”

height

•Corrosion resistant (316L Stainless

Steel)

•NEMA 4X, IP68, hermetically sealed

enclosure

•ESD and EMI protection

•Overload protection

•Reverse wiring protection

•Available for either acceleration or

velocity measurement

•CE Certified

•No Trim Pots required

ORDERING INFORMATION

AND MODEL NUMBERS

Key Model Number

DESIG. DESCRIPTION

570B 2-wire, 12-36 VDC Stud Mount

Vibration transmitter. 4-20 mADC

output.

Table 1 - Measurement

DESIG. DESCRIPTION

A Acceleration, 0 - 5 G peak

B Acceleration, 0 - 10 G peak

C Acceleration, 0 - 20 G peak

D Velocity, 0 - 0.5 IPS peak

E Velocity, 0 - 1 IPS peak

F Velocity, 0 - 2 IPS peak

Accessory Items*

PART NO. DESCRIPTION

086568A0016 Standard Cable - 16 foot, 2 conductor

shielded cable, MIL-C-5015 2 socket

connector with splash-proof boot.

086568A0032 Standard Cable - same as above

except 32 foot

086568A0064 Standard Cable - same as above

except 64 foot

086568A0112 Standard Cable - same as above

except 112 foot

086568B0016 IP68 Cable - 16 foot, 2 conductor

shielded cable, MIL-C-5015 2 socket

connector with splash-proof boot

086568B0032 IP68 Cable - same as above except

32 foot

086568B0064 IP68 Cable - same as above except

64 foot

086568B0112 IP68 Cable - same as above except

112 foot

* 16 foot standard cable is a stock item.

For other cables allow 6-8 weeks delivery.

Cable accessory must be ordered separately.

SPECIFICATIONS

DYNAMIC

Output (±5% of span) ……………..……....… 4 – 20 mADC

Vibration Range ………………………..…..…… See Table 1

Frequency Response-Acceleration:

- 3 dB …..………………….….…... 2 Hz – 2 kHz

Frequency Response-Velocity:

- 3 dB …..…………………..…… 2 Hz – 2.5 kHz

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

Resonant Frequency, mounted, nominal ………..…… 18 kHz

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

ELECTRICAL

Power Requirements (Two wire loop power):

Voltage Source …………….....12 VDC – 36 VDC

Loop Resistance ……….…………………….……. see page 4

Grounding ………….………………………….. case isolated,

internally shielded

Protection ………………….……… reverse wiring, overload,

ESD & EMI

ENVIRONMENTAL

Temperature Range ….…….… -40°to 85°C (-40°to 185°F)

Vibration Limit ……………………………………250 g peak

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

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

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

PHYSICAL

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

Weight ……………………………………………..162 grams

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

Case Rating ………………………………... IP68, NEMA 4X

Mounting ……………………………..… 1/4 – 28 tapped hole

Supplied Accessories …………………. 1/4-28 mounting stud

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

Pin A ……………………………………. plus (+)

Pin B …………………………………….minus (-)

Cabling ……………………………… two conductor shielded

(see Accessory Items Table)

Torque Limit ………………………………... 30 in. lbs. Max.

Warranty ………………………………………………. 1 year

CERTIFICATIONS

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 a

surface texture no greater than 32 micro-inches.

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

transmitter and the mounting surface producing

optimum frequency response.

Proper screw torque on the mounting stud is also

required. Under-torquing the transmitter reduces

the stiffness of the coupling. Over-torquing can

cause permanent thread damage to the transmitter.

It is recommended that the 1/4-28 stud be torqued

to a value of 30 inch-pounds.

SURFACE 32 1.25″DIA MIN

FINISH

.004 A

.001

-A-

.35

.25

Before stud mounting the transmitter, 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.

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

transmitter cable alongside AC power lines; cables

must cross AC power lines at right angles. Where

possible, provide a separate grounded conduit to

enclose the transmitter 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 transmitters are

protected against ESD failure, temporary

distortion signals may appear at the output.

Cable Grounding and Ground Loops

In order to provide proper shielding and prevent

ground loops, cable grounding should be

carefully considered.

For transmitters 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.

Cable Anchoring

After mounting the transmitter, 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

transmitter.

LOOP RESISTANCE

Maximum loop resistance can be calculated by:

V power – 12 V

RL(max) =

20 mA

Loop resistance is the sum of the wiring resistance and

the load resistance.

Typical

POWER SOURCE

VOLTAGE

RL(max)

20 400 Ω

24 600 Ω

26 700 Ω

Reference: Robertshaw cable resistance is 40 Ω

per thousand feet.

Typical Circuit

White

Pin A

DC Power

Pin B Black Supply

RLoad

Model 570B

Signal Measuring Circuit

Due to continued research and development, the manufacturer

reserves the right to amend these specifications without notice.

Q-4166 (8/01) Printed in U.S.A.

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