Edwards ASG-1000-NW16 User manual

D357-25-880
Issue E
Instruction Manual
Active Strain Gauge
Description Item Number
ASG-1000-1/8 NPT D357-25-000
ASG-1000-NW16 D357-26-000
ASG-2000-1/8 NPT D357-27-000
ASG-2000-NW16 D357-28-000

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Contents
D357-25-880 Issue E
Contents
Section Page
1 Introduction ....................................................................................... 1
1.1 Scope of this manual .................................................................................................... 1
1.2 Description ................................................................................................................ 1
1.3 Gas dependency .......................................................................................................... 1
2 Technical data .................................................................................... 3
2.1 Mechanical data .......................................................................................................... 3
2.2 Performance, operation and storage conditions .................................................................... 3
2.3 Electrical data ............................................................................................................ 4
2.4 Material exposed to vacuum ........................................................................................... 4
3 Installation ......................................................................................... 5
3.1 Unpack and inspect ...................................................................................................... 5
3.2 Fit the ASG to the vacuum system .................................................................................... 5
3.3 Electrical connections ................................................................................................... 5
3.3.1 Connect to Edwards controller ........................................................................................ 5
3.3.2 Connect to your own supply and control equipment ............................................................... 5
4 Operation .......................................................................................... 9
4.1 Pressure measurement .................................................................................................. 9
5 Maintenance ..................................................................................... 11
5.1 Zero adjustment ........................................................................................................11
5.2 Cleaning ..................................................................................................................11
6 Storage and disposal ........................................................................... 13
6.1 Storage ...................................................................................................................13
6.2 Disposal ................................................................................................................... 13
7 Spares and accessories ......................................................................... 15
7.1 Introduction .............................................................................................................15
7.2 Accessories ...............................................................................................................15
For return of equipment, complete the HS Forms at the end of this manual.
Illustrations
Figure Page
1 General view of NW16 version active strain gauge ................................................................. 2
2 Dimensions of active strain gauge ..................................................................................... 4
3 Pins on the ASG electrical connector socket ........................................................................ 6
4 Pins on the ASG adapter cable socket ................................................................................ 6
5 Schematic diagram of typical electrical connections using 4 pin DIN connector .............................. 7
6 Schematic diagram of typical electrical connections using FCC68 connector .................................. 7
dcs/7822/12/07

D357-25-880 Issue E
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Contents
Tables
Table Page
1 Zeroing pressure ........................................................................................................11

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Introduction
D357-25-880 Issue E
1Introduction
1.1 Scope of this manual
This manual provides installation, operation and maintenance instructions for the Edwards ASG (Active Strain Gauge).
You must use the ASG as specified in this manual.
Read this manual before you install and operate the ASG. Important safety information is highlighted as WARNING
and CAUTION instructions; you must obey these instructions. The use of WARNINGS and CAUTIONS is defined below.
CAUTION
Cautions are given where failure to observe the instruction could result in damage to the equipment, associated
equipment or process.
The unit used through this manual conforms to the SI international system of units of measurement.
The following symbols appear on the ASG:
1.2 Description
The ASG, shown in Figure 1, is a strain gauge and gauge controller in a single compact unit. The measurement range
of the ASG-1000 is 1000 to 1 mbar. The range of the ASG-2000 is 2000 to 1 mbar.
The ASG requires a 13.5 to 36 V d.c. power supply: it has a 0 to 10 V d.c. linear analogue output which is related to
pressure. The ASG is compatible with all of the Edwards AGCs (Active Gauge Controllers) and with the ADD (Active
Digital Display). Alternatively, you can use an independent power supply for the ASG and can read the ASG output
signal with a voltmeter or an analogue-to-digital converter. A standard Active gauge cable plus an ASG adapter cable
are used to connect the ASG to an AGC or ADD. These are available as accessories (refer to Section 7.2). To connect
to an electrical supply and voltmeter, the 4-way connector on the gauge head can be used.
A gauge identification signal is incorporated in the adapter cable: this is used by Edwards AGCs to identify which type
of active gauge is connected.
1.3 Gas dependency
The pressure sensing technique depends on the deflection of a stainless steel diaphragm. The measurement is
therefore completely independent of gas type.
WARNING
Warnings are given where failure to observe the instruction could result in injury or death to
persons.
Warning - refer to accompanying documentation.
From August 2005, Edwards will offer European customers a recycling service.

D357-25-880 Issue E
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Introduction
Figure 1 - General view of NW16 version active strain gauge

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Technical data
D357-25-880 Issue E
2Technicaldata
2.1 Mechanical data
2.2 Performance, operation and storage conditions
Dimensions See Figure 2
Mass 150 g
Volume of gauge tube
NW16 1.85 cm3
1/8 inch NPT 1.25 cm3
Enclosing rating IP65
Ambient temperature
operation -20 to 125 °C
storage -40 to 125 °C
Compensated pressure 10 to 50 °C
Ambient humidity (operating) 10 to 90% (non-condensing)
Pressure containment 180 mbar
Maximum over pressure 2 x full scale with negligible calibration change
Pressure range
ASG-1000 1000 to 1 mbar
ASG-2000 2000 to 1 mbar
Accuracy ±0.2% full scale
Stability 0.2% full scale
Temperature co-efficient 0.05% full scale per °C

D357-25-880 Issue E
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Technical data
2.3 Electrical data
Note: The relationship between the output signal voltage and the pressure is linear with 10 V corresponding to
the full scale of the gauge (e.g. for 1000 mbar full scale gauge 10 V is equivalent to 1000 mbar, 1 V is
equivalent to 100 mbar, 0.1 V is equivalent to 10 mbar etc).
2.4 Material exposed to vacuum
Stainless Steel 316L.
Figure 2 - Dimensions of active strain gauge
Electrical supply
Voltage +13.5 to 36 V d.c.
Max source resistance 100 Ω
Maximum power 0.4 W
Electrical connector 4 Pin Micro Din
Pressure output signal
Nominal range 0 ≤output ≤10 V d.c.
Extreme range output < -0.5 V d.c. or output > 30 V d.c.
Impedance 200 Ω
Min load 50 kΩ

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Installation
D357-25-880 Issue E
3 Installation
3.1 Unpack and inspect
Remove all packing material and protective covers and check the ASG.
If the ASG is damaged, notify your supplier and the carrier in writing within three days; state the Item Number of the
ASG together with your order number and your supplier’s invoice number. Retain all packing materials for inspection.
Do not use the ASG if it is damaged.
If the ASG is not to be used immediately, replace the protective covers. Store the ASG in suitable conditions as
described in Section 6.
3.2 Fit the ASG to the vacuum system
The ASG can be mounted in any orientation. To avoid the build-up of debris or condensable material in the body tube
of the ASG we recommend that you install the ASG vertically as shown in Figure 2.
To connect the ASG to your vacuum system:
zUse an O-Ring / centring ring or Co-seal and clamp to connect an NW16 flange to a similar flange on the
vacuum system.
zUse a stepped O-Ring carrier or Co-seal to connect an ASG with a NW16 flange to a NW10 flange.
zUse PTFE tape for 1/8 inch NPT connection.
3.3 Electrical connections
When using a cable longer than 30 m, full compliance with the EN61326 requires an in-line surge suppressor (please
refer to Section 7.2).
3.3.1 Connect to Edwards controller
Connect the ASG to the controller using an adapter cable and an active gauge cable (refer to Section 7).
3.3.2 Connect to your own supply and control equipment
Note: Do not connect the electrical supply common to the signal common. If you do, the ASG output signal will
be inaccurate.
If connection is to be made using the 4 pin DIN connector, the pin allocations are as shown in Figure 3.
WARNING
If the ASG malfunctions, the ASG pressure output may be incorrect. If such a failure could cause
injury to persons or damage equipment, you must install a suitable control system to indicate the
failure and, if necessary, to close down your process system.
Pin number Use
1 Electrical supply positive voltage
2 Electrical supply common
3 Pressure measurement output signal
4Outputcommon

D357-25-880 Issue E
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Installation
Figure 3 - Pins on the ASG electrical connector socket
If connection using an FCC68 connector is preferred, the ASG adapter cable may be used and the pin allocations are
as shown in Figure 4.
Figure 4 - Pins on the ASG adapter cable socket
Schematic diagrams of the recommended electrical connections to the ASG are shown in Figure 5 and 6.
Pin number Use
1 Electrical supply positive voltage
2 Electrical supply common
3 Pressure measurement output signal
4 Gauge identification signal
5 Signal common
6 No connection
7 No connection
8 No connection

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Installation
D357-25-880 Issue E
Figure 5 - Schematic diagram of typical electrical connections using 4 pin DIN connector
Figure 6 - Schematic diagram of typical electrical connections using FCC68 connector
1. ASG electrical connector socket
2. Cable electrical connector plug
3. Electrical supply
4. Voltmeter
1. Adapter cable electrical connector socket
2. Cable electrical connector plug
3. Electrical supply
4. Voltmeter

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Operation
D357-25-880 Issue E
4 Operation
4.1 Pressure measurement
For most accurate pressure measurement the procedure in Section 5.1 should be used to zero the gauge.
If you connect the ASG to an Edwards ADD or AGC display/controller, the pressure measured by the ASG is shown on
the display.
If you connect the signal output of the ASG to a voltmeter, convert the measured voltage to the corresponding
pressure value using the following formula:
Pressure = Full scale x Voltage
10

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Maintenance
D357-25-880 Issue E
5Maintenance
5.1 Zero adjustment
All diaphragm type gauges can exhibit a small drift in zero as a result of frequent cycling, over pressuring or
contamination. This can be corrected by carrying out a zero adjustment.
To zero the ASG, first evacuate the system to a pressure whose value is insignificant when compared to the required
measuring accuracy. Table 1 suggests the pressures that should be achieved for zeroing to give maximum accuracy.
Once the zeroing pressure has been achieved the ASG pressure display should be adjusted to zero. This can be done
using the zero setting potentiometer located on the side of the gauge head under the external O-Ring (see Figure 2).
The second potentiometer is for setting the gauge span and should not be adjusted without appropriate calibration
equipment. If the ASG is used with an Edwards Controller then the zero adjustment can be made at the display rather
than at the gauge head if this is more convenient (refer to the Controller’s instructions for details).
5.2 Cleaning
If the gas being measured contains oil vapour or other condensable products, the diaphragm may periodically become
contaminated which may cause shifts in both zero and span. Any clean solvent that is compatible with stainless steel
316L may be used to dissolve the condensate and flush out the pressure inlet port.
Note: Do not use any ultrasonic procedure in cleaning the gauge since that may damage the unit.
Table 1 - Zeroing pressure
Transducer Full Range (mbar) Zeroing Pressure (mbar)
2000 < 0.02
1000 < 0.01

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Storage and disposal
D357-25-880 Issue E
6 Storage and disposal
6.1 Storage
Return the ASG to its protective packaging and store the ASG in clean dry conditions until required for use. Do not
exceed the storage temperature conditions specified in Section 2.
When required for use, prepare and install the ASG as described in Section 3.
6.2 Disposal
Dispose of the ASG and any components safely in accordance with all local and national safety and environmental
requirements.
Alternatively, you may be able to recycle the ASG and/or cables; contact Edwards or your supplier for advice (also
see below).
The ASG and associated cables are within the scope of the European Directive on Waste Electrical and Electronic
Equipment, 2002/96/EC. From August 2005, Edwards will offer European customers a recycling service for the ASG/
cables at the end of the product’s life. Contact Edwards for advice on how to return the ASG/cables for recycling.
Particular care must be taken if the ASG has been contaminated with dangerous process substances.

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Spares and accessories
D357-25-880 Issue E
7 Spares and accessories
7.1 Introduction
Edwards products, spares and accessories are available from Edwards companies in Belgium, Brazil, Canada, France,
Germany, Great Britain, Hong Kong, Italy, Japan, Korea, Switzerland, U.S.A, and a world wide network of
distributors. The majority of these centres employ Service Engineers who have undergone comprehensive Edwards
training courses.
When you maintain this Edwards product, we recommend you use only Edwards maintenance and service kits.
Order spare parts and accessories from your nearest Edwards company or distributor. When you order, please state
for each part required:
zModel and Item Number of your equipment
zSerial number (if any)
zItem Number and description of part
7.2 Accessories
The adapter cable for use with the Edwards Active Gauge Controllers or Active Digital Displays is:
There are different lengths of cable to connect from the Edwards ASG to the adapter cable. They are as follows:
ASG adapter cable 0.5 m D400-03-060
Cable length Item Number
0.5 m 18 inches D400-01-005
1 m 3 feet D400-01-010
3 m 10 feet D400-01-030
5 m 15 feet D400-01-050
10 m 30 feet D400-01-100
15 m 50 feet D400-01-150
25 m 80 feet D400-01-250
50 m 150 feet D400-01-500
100 m 325 feet D400-01-999
Surge suppressor D400-06-000

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