D351-08-880
Instruction Manual
Active Thermocouple Gauge
Description Item Number
ATC-E D351-08-000
Issue K
Original Instructions
Declaration of Conformity
We, Edwards Limited,
Crawley Business Quarter,
Manor Royal,
Crawley,
West Sussex, RH10 9LW, UK
declare under our sole responsibility, as manufacturer and person within the EU authorised
to assemble the technical file, that the product(s)
Active Thermocouple Gauge D351-08-000
to which this declaration relates is in conformity with the following standard(s) or other
normative document(s)
EN61326-2-3: 2013 Electrical equipment for measurement, control and laboratory
(Class B Emissions, Use. EMC requirements. Particular requirements. Test
Basic Immunity) configuration, operational conditions and performance criteria
for transducers with integrated or remote signal conditioning
EN50581: 2012 Technical Documentation for the Assessment of Electrical and
Electronic Products with respect to the Restriction of Hazardous
Substances
and fulfils all the relevant provisions of
2014/30/EU Electromagnetic Compatibility (EMC) Directive
2011/65/EU Restriction of Certain Hazardous Substances (RoHS) Directive
2012/19/EU Waste Electrical and Electronic Equipment (WEEE) Directive
Note: This declaration covers all product serial numbers from the date this Declaration was
signed onwards.
19.08.2015, Eastbourne
Larry Marini, Senior Technical Manager
This product has been manufactured under a quality management system certified to ISO 9001:2008
Date and Place
P200-02-560 Issue H
D351-08-880 Issue K
Contents
Section Page
1 Introduction .......................................................................................1
1.1 Scope of this manual .................................................................................................... 1
1.2 General .................................................................................................................... 1
2 Technical data ....................................................................................3
2.1 Operating conditions .................................................................................................... 3
2.2 Performance .............................................................................................................. 3
2.2.1 Output signal .............................................................................................................3
2.2.2 setpoint ................................................................................................................... 3
2.2.3 Gauge identification signal ............................................................................................. 3
2.3 Mechanical data .......................................................................................................... 4
2.4 Electrical data ............................................................................................................ 4
2.4.1 Electrical supply data ................................................................................................... 4
2.4.2 Electronic interface ..................................................................................................... 4
2.5 Thermocouple gauge tubes ............................................................................................. 4
2.5.1 Materials exposed to vacuum .......................................................................................... 4
2.5.2 Colour coding .............................................................................................................5
2.5.3 Pressure range ........................................................................................................... 5
2.5.4 Thermocouple temperature ............................................................................................ 5
2.5.5 Maximum internal overpressure ....................................................................................... 5
Contents
3 Installation ............................................... ................................... .......7
3.1 Unpacking and inspection .............................................................................................. 7
3.2 Connection to the vacuum system .................................................................................... 7
3.3 Positioning the gauges .................................................................................................. 7
3.4 Electrical connection .................................................................................................... 7
3.5 Gauge setpoint trip ...................................................................................................... 7
3.5.1 Adjusment ................................................................................................................ 7
3.5.2 Trip output ................................................................................................................ 8
4 Operation ........................................................................................ 13
4.1 Reading the pressure ...................................................................................................13
4.2 Gas dependency .........................................................................................................13
5 Maintenance ..................................................................................... 15
5.1 General ................................................................................................................... 15
5.2 Fault finding .............................................................................................................15
6 Storage and disposal ........................................................................... 17
6.1 Storage ...................................................................................................................17
6.2 Disposal ...................................................................................................................17
7 Accessories ...................................................................................... 19
7.1 Introduction .............................................................................................................19
7.2 Accessories ...............................................................................................................19
7.2.1 Cables ....................................................................................................................19
7.3 ATC spares ...............................................................................................................19
dcs/7692/07/15
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For return of equipment, complete the HS Forms at the end of this manual.
D351-08-880 Issue K
Contents
Illustrations
Figure Page
1 General view of gauge .................................................................................................. 9
2 Connection to external power supply ...............................................................................10
3 Connection of external relay .........................................................................................10
Tables
Table Page
1 Pressure/voltage characteristic for DV4D ...........................................................................11
2 Pressure/voltage characteristic for DV6M ..........................................................................12
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Edwards and the Edwards logo are trademarks of Edwards Limited.
D351-08-880 Issue K
CAUTION
WARNING
1Introduction
1.1 Scope of this manual
This manual provides installation, operation and routine maintenance instructions for the Edwards Active
Thermocouple Gauge. Read this manual before installing and operating the gauge.
This manual contains essential safety information which supplements the safety features of the gauge. Safety
procedures are highlighted as WARNING and CAUTION instructions. You must obey these instructions. The use of
WARNINGS and CAUTIONS is defined below.
Warnings are given where failure to observe the instruction could result in injury or death to
people.
Cautions are given where failure to observe the instruction could result in damage to the equipment, associated
equipment and process.
Introduction
The following labels appear on the gauge:
Warning - refer to accompanying documentation.
Edwards offer European customers a recycling service.
1.2 General
The family of Active vacuum instruments is a new generation of stand-alone units which combine gauge-head and
controller in one active unit. The Active Thermocouple Gauge (ATC) consists of an electronics module which is
compatible with two types of Thermocouple gauge tubes, the DV4D and DV6M. The module connects to the tube via
a standard octal socket. The ATC requires a 13.5 to 36 V d.c. power supply, the pressure reading can be monitored
with a simple voltmeter or the analogue to digital converter of a data acquisition syste m. The type of Gauge tube to
be used is selected by a colour-coded two-position switch located in the top of the electronics module. The
electronics module also has a potentiometer used to adjust the operating pressure of a setpoint and a LED which
indicates the status of the setpoint. The gauge tubes terminate in a 1/8 inch NPT fitting. An adapter to allow
connection to NW16 flanges is available from Edwards (refer to spares list). Figure 1 illustrates the main features of
the ATC gauge.
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D351-08-880 Issue K
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2Technical data
2.1 Operating conditions
Operating temperature 5 °C to 50 °C
Relative humidity (non-condensing) 10 - 90%
Maximum operating altitude 2000 m
2.2 Performance
2.2.1 Output signal
Voltage range 2 V to 10 V d.c.
Error status < 2 V or > 10 V d.c.
Minimum load 10 k
Maximum current source 1 mA
D351-08-880 Issue K
Technical data
2.2.2 setpoint
The setpoint consists of an open drain transistor (FET) output which operates when the gauge pressure is below a
preset value. The setpoint has a fixed hysteresis of 1.2 V, that is, if the trip level is set to 4 V, then the trip is set
(ON) when the gauge output is below 4 V and reset (OFF) above 5.2 V. When the trip is 'ON' pin 6 is internally
connected to pin 2 (power supply common) and the red LED is illuminated.
Settable range 2.2 to 8.5 V
Fixed hysteresis 1.2 V
setpoint output transistor ratings
Voltage rating 40 V
Current rating 100 mA
Note: The external load must not exceed these ratings.
2.2.3 Gauge identification signal
The gauge identification signal is measured between pins 4 and 5, the readings are dependent upon the position of
the gauge select switch.
DV4D 56 k
DV6M 68 k
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D351-08-880 Issue K
Technical data
2.3 Mechanical data
Electronics module 56 mm (height) x 57 mm diameter.
Gauge tube 78 mm (length) x 32 mm diameter.
Assembled length of tube and electronics module 115 mm
Gauge tube volume DV4D 0.82 cm
DV6M 8.2 cm
Total weight:
Electronics module and gauge tube 120 grams
Vacuum connection 1/8 inch NPT
2.4 Electrical data
2.4.1 Electrical supply data
Input voltage range 13.5 V to 36 V d.c.
Maximum voltage ripple 1 V peak to peak
Maximum power consumption 540 mW
(when driven at 36 V d.c. at vacuum)
3
3
2.4.2 Electronic interface
Socket connection FCC68, 8 way Western Electric
Pin allocation (See Figure 1 inset)
1 Power supply positive voltage
2Power supply common
3 Gauge output signal
4 Gauge identification signal
5 Signal common
6setpoint output
7Not connected
8Not connected
2.5 Thermocouple gauge tubes
Data refers to DV4D and DV6M unless otherwise stated.
2.5.1 Materials exposed to vacuum
Nickel plated steel, alloy 52 (iron nickel) pins, stainless steel, gold, platinum, rhodium and palladium. Th e DV4D also
has a small amount of 60 Tin/40 lead solder.
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Edwards and the Edwards logo are trademarks of Edwards Limited.
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