Omega Engineering Thermometer GP901 User Manual

Series 956  
User’s Guide  
GP901 Series  
Digital Probes  
 
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-ꢀ GP901-5 GP901-10 GP901-ꢀ0  
Calibrated Stroke  
mm  
0.5  
0.58  
0.03  
N/A  
N/A  
1
2
5
10  
20  
21  
Full Mechanical Travel  
Resolution (14 bit over stroke)  
Resolution (16 bit over stroke)  
Resolution (18 bit over stroke)  
Accuracy  
1.5  
3 (*2.5)  
0.122  
0.03  
6
11  
0.061  
0.015  
N/A  
0.305  
0.076  
0.019  
0.610  
0.152  
0.038  
1.22  
0.305  
0.076  
mm  
N/A  
mm  
see Accuracy section below  
Repeatability  
<0.1 mm  
<0.15 mm  
Reading Rate per Network channel  
Reading Rate (per PIE)  
1000 readings / second minimum  
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  
Temperature Range  
2061°C  
0 to 60°C  
Warm up Period  
General Data  
30 minutes  
Supply Voltage  
5 60.25Vdc  
0.06 A max.  
31 modules  
Current Consumption  
PIE per Orbit channel  
GP901 M-3343 05/08  
 
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  
6 0.1 mm 6 0.1% x D  
6 0.1 mm 6 0.1% x D  
6 0.1 mm 6 0.2% x D  
6 0.1 mm 6 0.2% x D  
6 0.1 mm 6 0.2% x D  
1 mm Probes i.e. GP901-1-S  
2 mm Probes i.e. GP901-2-S, GP901-2-P  
5 mm Probes i.e. GP901-5-S, GP901-5-P  
10 mm Probes i.e. GP901-10-S, GP901-10-P  
20 mm Probes i.e. GP901-20-S, GP901-20-P  
Gauge Head Specifications  
Specifications Common to All Gauge Head Types  
Body Material  
Stainless Steel 400 Series  
various types available  
<0.15 mm  
Probe tips  
Non-repeat  
Max. Angular Rotation of Tip  
Gaiter Material  
2°  
Viton®  
0.22 Nm – M2.5 Thread  
Max. Probe tip tightening Torque  
(when changing tip please take care not to damage probe) 0.12 Nm – M2 Thread  
Storage Temperature Range  
Operating Temperature  
-20°C to +100°C  
+5°C to +80°C  
Environmental Protection (see mounting notes)  
Cable Standard (not all types)  
Option (not all types)  
IP 65 (with gaiter)  
2m screened, PUR, insulation  
Standard cable with stainless steel or plastic braid  
Pneumatic Operation (Not GP901-05 version)  
Minimum operating pressure  
(bar)  
With Gaiter  
Without Gaiter  
0.4  
0.3  
Maximum operating pressure  
(bar)  
With Gaiter  
Without Gaiter  
1.0  
2.0  
Air leak rate ml/min. at 1.0 bar  
With Gaiter  
Without Gaiter  
<10  
<150  
GP901 M-3343 05/08  
 
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.  
GP901 M-3343 05/08  
5
 
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.  
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.  
GP901 M-3343 05/08  
 
PIE and T-CON Installation  
GP901 M-3343 05/08  
 
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GP901 M-3343 05/08  
 
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GP901 M-3343 05/08  
9
 
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10  
GP901 M-3343 05/08  
 
WARRANTY/DISCLAIMER  
OMEGA ENGINEERING, INC. warrants this unit to be free of defects in materials and workmanship for  
a period of 1ꢁ months from date of purchase. OMEGA Warranty adds an additional one (1) month grace  
period to the normal one (1) year product warranty to cover handling and shipping time. This ensures  
that OMEGA’s customers receive maximum coverage on each product.  
If the unit malfunctions, it must be returned to the factory for evaluation. OMEGA’s Customer Service  
Department will issue an Authorized Return (AR) number immediately upon phone or written request.  
Upon examination by OMEGA, if the unit is found to be defective, it will be repaired or replaced at no  
charge. OMEGA’s WARRANTY does not apply to defects resulting from any action of the purchaser,  
including but not limited to mishandling, improper interfacing, operation outside of design limits, improper  
repair, or unauthorized modification. This WARRANTY is VOID if the unit shows evidence of having been  
tampered with or shows evidence of having been damaged as a result of excessive corrosion; or current,  
heat, moisture or vibration; improper specification; misapplication; misuse or other operating conditions  
outside of OMEGA’s control. Components which wear are not warranted, including but not limited to con-  
tact points, fuses, and triacs.  
OMEGA is pleased to offer suggestions on the use of its various products. However, OMEGA  
neither assumes responsibility for any omissions or errors nor assumes liability for any damages  
that result from the use of its products in accordance with information provided by OMEGA, either  
verbal or written. OMEGA warrants only that the parts manufactured by it will be as specified and  
free of defects. OMEGA MAKES NO OTHER WARRANTIES OR REPRESENTATIONS OF ANY KIND  
WHATSOEVER, EXPRESS OR IMPLIED, EXCEPT THAT OF TITLE, AND ALL IMPLIED WARRANTIES  
INCLUDING ANY WARRANTY OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PUR-  
POSE ARE HEREBY DISCLAIMED. LIMITATION OF LIABILITY: The remedies of purchaser set forth  
herein are exclusive, and the total liability of OMEGA with respect to this order, whether based on  
contract, warranty, negligence, indemnification, strict liability or otherwise, shall not exceed the  
purchase price of the component upon which liability is based. In no event shall OMEGA be liable  
for consequential, incidental or special damages.  
CONDITIONS: Equipment sold by OMEGA is not intended to be used, nor shall it be used: (1) as a  
“Basic Component” under 10 CFR 21 (NRC), used in or with any nuclear installation or activity; or (2) in  
medical applications or used on humans. Should any Product(s) be used in or with any nuclear instal-  
lation or activity, medical application, used on humans, or misused in any way, OMEGA assumes no  
responsibility as set forth in our basic WARRANTY / DISCLAIMER language, and, additionally, purchaser  
will indemnify OMEGA and hold OMEGA harmless from any liability or damage whatsoever arising out of  
the use of the Product(s) in such a manner.  
RETURN REQUESTS / INQUIRIES  
Direct all warranty and repair requests/inquiries to the OMEGA Customer Service Department. BEFORE  
RETURNING ANY PRODUCT(S) TO OMEGA, PURCHASER MUST OBTAIN AN AUTHORIZED  
RETURN (AR) NUMBER FROM OMEGA’S CUSTOMER SERVICE DEPARTMENT (IN ORDER TO  
AVOID PROCESSING DELAYS). The assigned AR number should then be marked on the outside of the  
return package and on any correspondence.  
The purchaser is responsible for shipping charges, freight, insurance and proper packaging to prevent  
breakage in transit.  
FOR WARRANTY RETURNS, please have the  
following information available BEFORE contacting  
OMEGA:  
FOR NON-WARRANTY REPAIRS, consult OMEGA  
for current repair charges. Have the following infor-  
mation available BEFORE contacting OMEGA:  
1. Purchase Order number under which the product 1. Purchase Order number to cover the COST of the  
was PURCHASED,  
repair,  
2. Model and serial number of the product under  
warranty, and  
2. Model and serial number of the product, and  
3. Repair instructions and/or specific problems  
relative to the product.  
3. Repair instructions and/or specific problems  
relative to the product.  
OMEGA’s policy is to make running changes, not model changes, whenever an improvement is possible.  
This affords our customers the latest in technology and engineering.  
OMEGA is a registered trademark of OMEGA ENGINEERING, INC.  
© Copyright 1999 OMEGA ENGINEERING, INC. All rights reserved. This document may not be copied,  
photocopied, reproduced, translated, or reduced to any electronic medium or machine-readable form, in  
whole or in part, without the prior written consent of OMEGA ENGINEERING, INC.  
GP901 M-3343 05/08  
11  
 
Where Do I Find Everything I Need for  
Process Measurement and Control?  
OMEGA…Of Course!  
TEMPERATURE  
Thermocouple, RTD & Thermistor Probes, Connectors, Panels & Assemblies  
Wire: Thermocouple, RTD & Thermistor  
Calibrators & Ice Point References  
Recorders, Controllers & Process Monitors  
Infrared Pyrometers  
PRESSURE, STRAIN AND FORCE  
Transducers & Strain Gages  
Load Cells & Pressure Gages  
Displacement Transducers  
Instrumentation & Accessories  
FLOW/LEVEL  
Rotameters, Gas Mass Flowmeters & Flow Computers  
Air Velocity Indicators  
Turbine/Paddlewheel Systems  
Totalizers & Batch Controllers  
pH/CONDUCTIVITY  
pH Electrodes, Testers & Accessories  
Benchtop/Laboratory Meters  
Controllers, Calibrators, Simulators & Pumps  
Industrial pH & Conductivity Equipment  
DATA ACQUISITION  
Data Acquisition & Engineering Software  
Communications-Based Acquisition Systems  
Plug-in Cards for Apple, IBM & Compatibles  
Datalogging Systems  
Recorders, Printers & Plotters  
HEATERS  
Heating Cable  
Cartridge & Strip Heaters  
Immersion & Band Heaters  
Flexible Heaters  
Laboratory Heaters  
ENVIRONMENTAL  
MONITORING AND CONTROL  
Metering & Control Instrumentation  
Refractometers  
Pumps & Tubing  
Air, Soil & Water Monitors  
Industrial Water & Wastewater Treatment  
pH, Conductivity & Dissolved Oxygen Instruments  
1ꢀ  
GP901 M-3343 05/08  
 

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