Robertshaw 571A 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 571A is a loop powered

(14 – 30 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. When used with an approved barrier

the transmitter is intrinsically safe for use in

hazardous locations. Without a barrier the

transmitter is rated non-incendive.

Installation is simple and no calibration is

required. A 1/4-28 stud is provided for

mounting in a 1/4-28 tapped hole. 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 571A

Intrinsically Safe

Loop Powered Stud Mount

Vibration Transmitter

Cable Sold Separately

Features and Benefits:

• Two wire loop powered (14 – 30 VDC)

• 4 – 20 mADC output (isolated)

• Compact design, 1.12” diameter, 2.80”

height

• Corrosion resistant (316L Stainless

Steel)

• Certified Intrinsically Safe (with

barrier)

• Certified Non-Incendive (Division 2)

in the USA & Canada (without

barrier)

• NEMA 4X, IP68, hermetically sealed

enclosure

• ESD and EMI protection

• Overload protection

• Reverse wiring protection

• Available for either acceleration or

velocity measurement

• CE & ATEX Certified

• No Trim Pots required

ORDERING INFORMATION

AND MODEL NUMBERS

Order by model number in Table 1.

Table 1 - Measurement

MODEL NO. DESCRIPTION

571A-A Acceleration, 0 - 5 G peak

571A-B Acceleration, 0 - 10 G peak

571A-C Acceleration, 0 - 20 G peak

571A-D Velocity, 0 - 0.5 IPS peak

571A-E Velocity, 0 - 1 IPS peak

571A-F Velocity, 0 - 2 IPS peak

Accessory Items

PART NO. DESCRIPTION

086568A0016* Standard IP66 Cable - 16 foot,

2 conductor shielded cable,

MIL-C-5015 2 socket connector with

splash-proof boot.

086568A0032 Standard IP66 Cable - same as above

except 32 foot

086568A0064 Standard IP66 Cable - same as above

except 64 foot

086568A0112 Standard IP66 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

435KB311 Mounting stud for 1/4-28 tapped hole

(supplied with transmitter)

435KB311-01 Mounting stud for 3/8-24 tapped hole

435KB311-02 Mounting stud for M8 X 1.25-6G

tapped hole

435KB311-03 Mounting stud for M6 X 1.00-6G

tapped hole

* 16 foot standard cable is a stock item.

For other cables allow 6-8 weeks delivery.

Cable accessory must be ordered separately.

** For submersible applications use IP68 cable.

SPECIFICATIONS

DYNAMIC

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

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

Frequency Response:

- 3 dB …..………………….….…... 2 Hz – 2 kHz

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

Resonant Frequency, mounted, nominal ………..…… 28 kHz

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

ELECTRICAL

Power Requirements (Two wire loop power):

Voltage Source …………….....14 VDC – 30 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 (white lead) ………………………. plus (+)

Pin B (black lead) ……………………….minus (-)

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

(see Accessory Items Table)

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

Warranty ………………………………………………. 1 year

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.

CERTIFICATIONS

CSA Certified for the USA and Canada

Intrinsically Safe....................... Class I, Division 1,

Groups A, B, C & D; T3C

when connected as shown on

drawing 12641 (barrier required).

Non-Incendive .......................... Class I, Division 2,

Groups A, B, C & D

(barrier not required).

0081 II 1 G

LCIE 03 ATEX 6113X Certified for Europe

Intrinsically Safe................................. EEx ia IIC T3

when connected as shown on

drawing 12641 (barrier required).

Safety Barriers

Entity parameters

Groups .....................................A, B, C & D

Vmax or Ui...................................... 30 Vdc

Imax or Ii ........................................106 mA

Recommended Barriers................... MTL 706+,

MTL 787S+,

MTL 7087+,

MTL 7187+,

MTL 7787+,

STAHL 9001/51-280-091-14

Due to continued research and development, the manufacturer

reserves the right to amend these specifications without notice.

LOOP RESISTANCE

Maximum loop resistance can be calculated by:

V power – 14 V

RL(max) =

20 mA

Loop resistance is the sum of the wiring resistance and

the load resistance.

Typical

POWER SOURCE

VOLTAGE RL(max)

16 100 Ω

20 300 Ω

24 500 Ω

26 600 Ω

30 800 Ω

Reference: Robertshaw cable resistance is 40 Ωper

thousand feet.

Q-4169 (10/04) Printed in U.S.A.

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