Omega Engineering GP901 Series User manual

Series 956
User’s Guide
http://www.omega.com
e-mail: [email protected]
GP901 Series
Digital Probes

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OMEGAnet® On-Line Service
http://www.omega.com
Internet e-mail
[email protected]
Servicing North America:
USA: One Omega Drive, Box 4047
ISO 9001 Certied Stamford, CT 06907-0047
Tel: [phone] FAX: [phone]
e-mail: [email protected]
Canada: 976 Bergar
Laval (Quebec) H7L 5A1
Tel: [phone] FAX: [phone]
e-mail: [email protected]
For immediate technical or application assistance:
USA and Canada: Sales Service: 1-800-826-6342 / 1-800-TC-OMEGASM
Customer Service: 1-800-622-2378 / 1-800-622-BESTSM
Engineering Service: 1-800-872-9436 / 1-800-USA-WHENSM
TELEX: 996404 EASYLINK: 62968934 CABLE: OMEGA
Mexico and
Latin America: Tel: [phone] FAX: [phone]
En Espan˜ol: (95) 203-359-7803 e-mail: [email protected]
Servicing Europe:
Benelux: Postbus 8034, 1180 LA Amstelveen, The Netherlands
Tel: [phone] FAX: [phone]
Toll Free in Benelux: 0800 0993344
e-mail: [email protected]
Czech Republic: ul. Rude armady 1868, 733 01 Karvina-Hranice
Tel: [phone] FAX: [phone]
Toll Free: 0800-1-66342 e-mail: [email protected]
France: 9, rue Denis Papin, 78190 Trappes
Tel: [phone] FAX: [phone]
Toll Free in France: 0800-4-06342
e-mail: [email protected]
Germany/Austria: Daimlerstrasse 26, D-75392 Deckenpfronn, Germany
Tel: [phone] FAX: [phone]
Toll Free in Germany: 0130 11 21 66
e-mail: [email protected]
United Kingdom: One Omega Drive, River Bend Technology Centre
ISO 9002 Certied Northbank, Irlam, Manchester
M44 5EX, England
Tel: [phone] FAX: [phone]
Toll Free in the United Kingdom: 0800-488-488
e-mail: [email protected]
It is the policy of OMEGA to comply with all worldwide safety and EMC/EMI regulations that apply. OMEGA is constantly pursuing
certication of its products to the European New Approach Directives. OMEGA will add the CE mark to every appropriate device
upon certication.
The information contained in this document is believed to be correct, but OMEGA Engineering, Inc. accepts
no liability for any errors it contains, and reserves the right to alter specications without notice.
WARNING: These products are not designed for use in, and should not be used for, patient-connected applications.

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Introduction
The Digital Probe is a gauging transducer combined with conditioning electronics in a permanently
connected ”smart connector” or PIE (Probe Interface Electronics).
The PIE converts and corrects the output from the gauge head and transmits the result in a digital format
using the Orbit protocol. Because the Digital Probe is factory calibrated using a reference Laser, the probe
has a very linear output with position.
The Digital Probe is one of an extensive range of Orbit Modules available for use with the Orbit
Measurement System, which provides an easy way to construct and maintain a complete measurement
system of up to 372 Orbit modules.
The Orbit protocol features an extensive set of commands that enable fast and efficient transmission of
data between the Orbit module and the PC.
Digital Probe Specifications
This section contains the specifications of the Digital Probe. There are two sections, the first are the
specifications for the complete Digital Probe (PIE + gauge head) and the second is mechanical data
relevant to the gauge head only.
PIE is designed to be primarily used with the T-CON connector. Full details of mounting with T-CON refer
to the section of PIE and T-CON installation.
Digital Probe Data
Performance Data
Basic Probe Type GP901-05 GP901-1 GP901-2 GP901-5 GP901-10 GP901-20
Calibrated Stroke mm 0.5 125 10 20
Full Mechanical Travel 0.58 1.5 3 (*2.5) 6 11 21
Resolution (14 bit over stroke) mm0.03 0.061 0.122 0.305 0.610 1.22
Resolution (16 bit over stroke) N/A 0.015 0.03 0.076 0.152 0.305
Resolution (18 bit over stroke) N/A N/A N/A 0.019 0.038 0.076
Accuracy mm see Accuracy section below
Repeatability <0.1 mm<0.15 mm
Reading Rate per Network channel 1000 readings / second minimum
Reading Rate (per PIE) 240 readings / second minimum (4 ms internal update)
in Normal Mode
Up to 3906 readings per second in dynamic (8 probes per network)
Calibration Temperature 2061°C
Temperature Range 0 to 60°C
Warm up Period 30 minutes
General Data
Supply Voltage 5 60.25Vdc
Current Consumption 0.06 A max.
PIE per Orbit channel 31 modules

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Network type Orbit - RS485 2-wire multi-drop (up to 31 per channel)
Network speed 1.5Mbaud, 187.5k Baud or 9600 Baud (do not use 9600
Baud for New Applications as this will be phased out)
Network Control Character Break Character - low (space) of >90 us (187.5k Baud) or
>1.2mS (9600 Baud)
Command Character Format 1 start, 8 data, 1 odd parity, 1 stop bit
Accuracy
The error quoted assumes periodic re-setting against a setting master in accordance with normal gauging
practice (not less than once per day). As the Digital Probe may be used anywhere on its stroke the setting
master itself must be of known dimensions, but does not need to be precisely on its nominal value. The error
quoted for the Digital Probe therefore includes a factor dependant on the distance between the setting master
and the component being gauged.
Where D = difference in mm between setting master and component.
Error at calibration temperature: -
0.5 mm Probes i.e. GP901-05-S 6 0.05 mm 6 0.2% x D
1 mm Probes i.e. GP901-1-S 6 0.1 mm 6 0.1% x D
2 mm Probes i.e. GP901-2-S, GP901-2-P 6 0.1 mm 6 0.1% x D
5 mm Probes i.e. GP901-5-S, GP901-5-P 6 0.1 mm 6 0.2% x D
10 mm Probes i.e. GP901-10-S, GP901-10-P 6 0.1 mm 6 0.2% x D
20 mm Probes i.e. GP901-20-S, GP901-20-P 6 0.1 mm 6 0.2% x D
Gauge Head Specications
Specications Common to All Gauge Head Types
Body Material Stainless Steel 400 Series
Probe tips various types available
Non-repeat <0.15 mm
Max. Angular Rotation of Tip 2°
Gaiter Material Viton®
Max. Probe tip tightening Torque 0.22 Nm – M2.5 Thread
(when changing tip please take care not to damage probe) 0.12 Nm – M2 Thread
Storage Temperature Range -20°C to +100°C
Operating Temperature +5°C to +80°C
Environmental Protection (see mounting notes) IP 65 (with gaiter)
Cable Standard (not all types) 2m screened, PUR, insulation
Option (not all types) Standard cable with stainless steel or plastic braid
Pneumatic Operation (Not GP901-05 version)
Minimum operating pressure With Gaiter
(bar) Without Gaiter
0.4
0.3
Maximum operating pressure With Gaiter
(bar) Without Gaiter
1.0
2.0
Air leak rate ml/min. at 1.0 bar With Gaiter
Without Gaiter
<10
<150

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Gauge Head Application Information
When mounting the Gauge Head in a fixture, care must be taken as the linear bearing assembly at the
tip end is made to very fine tolerances. If a high force is applied to the probe casing performance may be
affected. Ideally probes should be clamped in a yoke, split or collar clamp. If single point screw clamping
is adopted (see diagram), then a tightening torque (in Nm) should be limited to that which will give a
maximum of 50Kg point load. The Gauge Head may be mounted in any attitude.
where d = Screw dia. (mm)
P = Screw pitch (mm)
(assumes a V form thread and 0.15 coefficient of friction).
Typical maximum torque is 0.27 Nm (i.e. M5 x 0.8 steel or 10-32 UNF steel)
A clearance hole in the fixturing of 9.5 mm F is desirable around the gaiter for satisfactory operation.
Tip
Generally, where piece parts are automatically loaded into a fixture, or where there is the possibility of
severe side loads, the use of pneumatically operated transducers is strongly recommended.
To remove the tip, the shaft should be fully retracted into the body before unscrewing.
Pneumatic Gage Heads
The tip of a pneumatic Gage Head is normally biased in the inward direction and the extension of the tip is
achieved by applying air pressure to the Gauge Head nozzle.
Air pressure may be varied within the specified limits to achieve the desired tip force at zero. The
pneumatic Gage Heads are designed to be leak free and of small volume to minimise the air flow
requirements and maintain a consistent tip force. Care must be taken not to damage the gaiter seal as the
satisfactory operation of the Gage Head is entirely dependent on this component. A clearance hole in the
fixturing of 9.5 mm F is desirable around the gaiter for satisfactory operation.
To maximise working life of the Gage Heads the air supply should be both clean and dry for continual
reliable operation. Maximum relative humidity of 60 % RH and filtered to better than 5 µm particle size.
Environmental Considerations
Most Gage Heads are designed to be used with a gaiter and are designed to withstand the rigours of
in-process gauging and will operate satisfactorily in the presence of copious amounts of coolants and
cleaning solvents.
For Gage Heads without a gaiter such as Feather touch or in situations where removal of the gaiter is
necessary (i.e. at low temperatures where stiffening of the gaiter may be a problem) then the working
atmosphere must be both clean and dry. Ingress of dirt or fluids may interfere with the performance of the
probe or even cause damage.

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The Orbit Network has been designed to meet EMC requirements EN50081-1 for emissions and
EN50082-1 for immunity when properly installed. The T-CON case should be connected to a good elec-
trical ground. The mounting option using the captive nuts is the preferred method. Ensure screws make
good contact with the mounting surface. If the mounting option using plastic feet is used paint should be
removed from the T-CON base pads to ensure good electrical contact with mounting surfaces.
Cable
The Gage Head cable is custom made to achieve the optimum balance between flexibility, flex life,
chemical resistance, abrasion resistance electrical and electrical screening.
To minimise transducer failure due to cable damage cable runs should be positioned well clear of moving
components and vulnerable working areas. If the cable is in a flex situation then a minimum bend radius
of 150 mm should be maintained, the vacuum and pneumatic options should not be flexed from the
transducer cable entry, but should be anchored separately at a position of 50 - 70 mm from the end cap.
If the cable of a Digital probe is damaged it is not possible to repair it without affecting probe calibration. It
must be replaced.
Connections
The PIE is designed to be used with the T-CON connector and allows for fast network configuration. All
connections are via the 9-way sub D-type connector.

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PIE and T-CON Installation

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