Varian FRG-700 series User manual

vacuum technologies
FRG-700
Inverted
Magnetron Pirani
Gauge
SHORT OPERATING
INSTRUCTIONS
Manual No. tqma48e1
Revision --
November 2008

2
FRG-700 Inverted Magnetron Pirani
Gauge
Copyright 2008
Vacuum Technologies

FRG-700 Inverted Magnetron Pirani Gauge
3
Warranty
Products manufactured by Seller are warranted against defects
in materials and workmanship for twelve (12) months from date
of shipment thereof to Customer, and Seller’s liability under valid
warranty claims is limited, at the option of Seller, to repair, to re-
place, or refund of an equitable portion of the purchase price of
the Product. Items expendable in normal use are not covered by
this warranty. All warranty replacement or repair of parts shall be
limited to equipment malfunctions which, in the sole opinion of
Seller, are due or traceable to defects in original materials or
workmanship. All obligations of Seller under this warranty shall
cease in the event of abuse, accident, alteration, misuse, or
neglect of the equipment. In-warranty repaired or replaced parts
are warranted only for the remaining unexpired portion of the
original warranty period applicable to the repaired or replaced
parts. After expiration of the applicable warranty period, Custo-
mer shall be charged at the then current prices for parts, labor,
and transportation.
Reasonable care must be used to avoid hazards. Seller expres-
sly disclaims responsibility for loss or damage caused by use of
its Products other than in accordance with proper operating pro-
cedures.
Except as stated herein, Seller makes no warranty, express or
implied (either in fact or by operation of law), statutory or other-
wise; and, except as stated herein, Seller shall have no liability
under any warranty, express or implied (either in fact or by oper-
ation of law), statutory or otherwise. Statements made by any
person, including representatives of Seller, which are inconsis-
tent or in conflict with the terms of this warranty shall not be bin-
ding upon Seller unless reduced to writing and approved by an
officer of Seller.

FRG-700 Inverted Magnetron Pirani Gauge
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Warranty Replacement and Adjustment
All claims under warranty must be made promptly after occur-
rence of circumstances giving rise thereto, and must be received
within the applicable warranty period by Seller or its authorized
representative. Such claims should include the Product serial
number, the date of shipment, and a full description of the cir-
cumstances giving rise to the claim. Before any Products are
returned for repair and/or adjustment, written authorization from
Seller or its authorized representative for the return and instruc-
tions as to how and where these Products should be returned
must be obtained. Any Product returned to Seller for examination
shall be prepaid via the means of transportation indicated as
acceptable by Seller. Seller reserves the right to reject any war-
ranty claim not promptly reported and any warranty claim on any
item that has been altered or has been returned by non-accepta-
ble means of transportation. When any Product is returned for
examination and inspection, or for any other reason, Customer
shall be responsible for all damage resulting from improper
packing or handling, and for loss in transit, not withstanding any
defect or non-conformity in the Product. In all cases, Seller has
the sole responsibility for determining the cause and nature of
failure, and Seller’s determination with regard thereto shall be
final.
If it is found that Seller’s Product has been returned without
cause and is still serviceable, Customer will be notified and the
Product returned at Customer’s expense; in addition, a charge
for testing and examination may be made on Products so
returned.
3/1/00

FRG-700 Inverted Magnetron Pirani Gauge
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Product Identification
In all communications with VARIAN, please specify the infor-
mation given on the product nameplate. For convenient refer-
ence copy that information into the space provided below.
Model:
PN:
SN:
V W
VARIAN Lexington MA 02421 USA
Validity
This document applies to products with the following part num-
bers:
FRG700KF25 (DN 25 ISO-KF)
FRG700CF35 (DN 40 CF-F)
The part number (PN) can be taken from the product nameplate.
If not indicated otherwise in the legends, the illustrations in this
document correspond to the gauge with vacuum connection
DN 25 ISO-KF. They apply to the gauge with other vacuum
connection by analogy.
We reserve the right to make technical changes without prior
notice.
All dimensions in mm.

FRG-700 Inverted Magnetron Pirani Gauge
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Intended Use
The Inverted Magnetron Pirani Gauge FRG-700 has been
designed for vacuum measurement in the pressure range of
5×10-9 … 1000 mbar.
The Inverted Magnetron Pirani Gauge must not be used for
measuring flammable or combustible gases which react in air.
The gauge can be operated in connection with a VARIAN
FRG Control Unit, a VARIAN Turbo AG Rack Controller, or with
another controller.
Functional Principle
The gauge consists of two separate measurement systems
(Pirani and cold cathode system) the signals of which are
combined in such a way that one measurement signal is output.
The Pirani measurement circuit is always on.

FRG-700 Inverted Magnetron Pirani Gauge
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Contents
Warranty 3
Warranty Replacement and Adjustment 4
Product Identification 5
Validity 5
Intended Use 6
Functional Principle 6
1Safety 8
1.1 Symbols Used 8
1.2 Personnel Qualifications 8
1.3 General Safety Instructions 9
2Technical Data 10
3Installation 17
3.1 Vacuum Connection 17
3.2 Electrical Connection 21
4Operation 22
4.1 Gas Type Dependence 22
4.2 Ignition Delay 22
4.3 Adjusting the Gauge 23
5Deinstallation 26
6Maintenance, Troubleshooting 27
7Returning the Product 28
8Disposal 28
9Literature 29
EC Declaration of Conformity 30
For cross-references within this document, the symbol (→XY)
is used, for cross-references to further documents, listed under
literature, the symbol (→[Z]).

FRG-700 Inverted Magnetron Pirani Gauge
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1 Safety
1.1 Symbols Used
DANGER
Information on preventing any kind of physical injury.
WARNING
Information on preventing extensive equipment and environ-
mental damage.
Caution
Information on correct handling or use. Disregard can lead to
malfunctions or minor equipment damage.
Notice
1.2 Personnel Qualifications
Skilled personnel
All work described in this document may only be carried out by
persons who have suitable technical training and the neces-
sary experience or who have been instructed by the end-user
of the product.

FRG-700 Inverted Magnetron Pirani Gauge
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1.3 General Safety Instructions
•Adhere to the applicable regulations and take the necessary
precautions for the process media used.
Consider possible reactions with the product materials.
Consider possible reactions (e.g. explosion) of the process
media due to the heat generated by the product.
•Adhere to the applicable regulations and take the necessary
precautions for all work you are going to do and consider the
safety instructions in this document.
•Before beginning to work, find out whether any vacuum com-
ponents are contaminated. Adhere to the relevant regulations
and take the necessary precautions when handling contamin-
ated parts.
DANGER
DANGER: magnetic fields
Strong magnetic fields can disturb electronic
devices like heart pacemakers or impair their
function.
Maintain a safety distance of ≥10 cm between the
magnet and the heart pacemaker or prevent the
influence of strong magnetic fields by antimagnetic
shielding.
Communicate the safety instructions to all other users.

FRG-700 Inverted Magnetron Pirani Gauge
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2 Technical Data
Measuring range (air, N2) 5×10-9 … 1000 mbar
Accuracy ≈±30% (in the range
1×10-8 … 100 mbar)
Repeatability ≈±5% (in the range
1×10-8 … 100 mbar)
Output signal (measuring signal)
Voltage range 0 … +10.5 V
Measurement range 1.82 … 8.6 V
Voltage vs. pressure logarithmic , 0.6 V/decade
Error signal <0.5 V no supply
>9.5 V Pirani sensor de-
fective (filament rupture)
Output impedance 2×10 Ω
Minimum loaded impedance 10 kΩ, short-circuit proof
Response time
p > 10-6 mbar
(pressure dependent)
<10 ms
p = 10-8 mbar ≈1000 ms
Identification gauge 85 kΩ, referenced to
supply common
Status pin 6
p > 10-2 mbar
Pirani-only mode Low = 0 V
p < 10-2 mbar
Cold cathode not ignited
Pirani-only mode
Low = 0 V
p < 10-2 mbar
Cold cathode ignited
Combined Pirani / cold
cathode mode
High = 15 … 30 VDC
LED High voltage on (LED on)

FRG-700 Inverted Magnetron Pirani Gauge
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Supply
DANGER
The gauge may only be connected to power sup-
plies, instruments or control devices that conform
to the requirements of a grounded protective extra-
low voltage (SELV-E according to EN 61010). The
connection to the gauge has to be fused 1).
Voltage at the gauge 15 … 30 VDC
(ripple ≤1 Vpp)
Power consumption ≤2 W
Fuse 1) ≤1 AT
Voltage at the supply unit with
maximum cable length
16 … 30 VDC
(ripple ≤1 Vpp) 2)
Adjustment
Potentiometer <HV>
Potentiometer <ATM>
adjustment under 10-4 mbar
adjustment at atmospheric
pressure
Electrical connection FCC68 socket, 8 poles
Sensor cable 8 poles, shielded
Line length ≤50 m (8×0.14 mm²)
Operating voltage ≤3.3 kV
Operating current ≤500 µA
Grounding concept →"Electrical Connection"
Vacuum connection –measuring
common
connected via 10 kΩ(max.
voltage differential with
respect to safety ±50 V
accuracy ±10 V)
Supply common – signal common conducted separately
1) VARIAN controllers fulfill this requirement.
2)The minimum voltage of the power supply unit must be increased
proportionally to the length of the sensor cable

FRG-700 Inverted Magnetron Pirani Gauge
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Materials on the vacuum side
Vacuum connection
Measurement chamber
Feedthrough isolation
Internal seal
Anode
Ignition aid
Pirani measurement tube
Pirani filament
stainless steel
stainless steel
ceramic
FPM 75
Mo
stainless steel
Ni, Au
W
Internal volume ≈20 cm³
Pressure ≤10 bar (absolute),
limited to inert gases
Temperatures
Operation
Bakeout
Pirani filament
Storage
+5 … +55 °C
150 °C (without electronics
and magnetic shielding)
120 °C
-40 … +65 °C
Relative humidity ≤80% at temperatures
≤+31°C decreasing to 50%
at +40°C
Mounting orientation any
Use indoors only, altitude up to
2000 m
Type of protection IP 40

FRG-700 Inverted Magnetron Pirani Gauge
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Dimensions [mm]
18
DN 25 ISO-KF
DN 40 CF-F
24
92
ø 63.5
28 55
60
75
Weight
FRG700KF25
FRG700CF35
≈700 g
≈980 g

FRG-700 Inverted Magnetron Pirani Gauge
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Measuring Signal vs. Pressure
Pressure p
1E+04
1E+02
1E+00
U [V]
0.00.5 1.5 2.5 3.5 4.5 5.5 6.5 7.5 8.5 9.5 10.5
1E–02
1E–04
1E–06
1E–08
sensor error
underrange
overrange
sensor error
Pa
mbar
torr
p = 101.667U-d
Measurement signal U [V]
p = 101.667×U-d ⇔U = c + 0.6log10 p
mbar Pa Torr
d 11.33 9.33 11.46
c 6.8 5.6 6.875
valid in the range 5×10-9 mbar <p< 1000 mbar
3.8×10-9 Torr <p< 750 Torr
5×10-7 Pa <p< 1×105Pa

FRG-700 Inverted Magnetron Pirani Gauge
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Gas Type Dependence
102
8
6
4
2
101
8
6
4
2
100
8
6
4
2
10–1
8
6
4
2
10–2
p (mbar)
peff (mbar)
10–3 246 10–2 246 10–1 246 100246 101246 102
H2He Ne
Xe
Ar
Freon 12
Water
vapor
Air
O2
CO
N2
Kr
Indication range
>10-2 mbar)
CO2

FRG-700 Inverted Magnetron Pirani Gauge
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p (mbar)
6
4
2
6
4
2
6
4
2
10–4
8
6
4
2
He
Ar
Air
N2
O2
CO
10–5
8
6
4
2
10–6
10–3
8
10–2
8
10–1
8
Indication range
10-6 ... 10-1 mbar
peff (mbar)
10-6 246 10-6 246 10–4 246 10-3 246 10-2 246 10-1
In the range below 10-5 mbar, the pressure indication is linear.
For gases other than air, the pressure can be determined by
means of a simple conversion formula:
peff = K × pressure reading
Where Gas type K (mean values)
Air (O2, CO, N2)
Xe
Kr
Ar
H2
Ne
He
1.0
0.4
0.5
0.8
2.4
4.1
5.9

FRG-700 Inverted Magnetron Pirani Gauge
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3 Installation
3.1 Vacuum Connection
DANGER
DANGER: overpressure in the vacuum system
>1 bar
Injury caused by released parts and harm caused
by escaping process gases can result if clamps are
opened while the vacuum system is pressurized.
Do not open any clamps while the vacuum system
is pressurized. Use the type clamps which are
suited to overpressure.
DANGER
DANGER: overpressure in the vacuum system
>2.5 bar
KF flange connections with elastomer seals (e.g.
O-rings) cannot withstand such pressures. Process
media can thus leak and possibly damage your
health.
Use O-rings provided with an outer centering ring.

FRG-700 Inverted Magnetron Pirani Gauge
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DANGER
DANGER: protective ground
Products that are not correctly connected to ground
can be extremely hazardous in the event of a fault.
Electrically connect the gauge to the grounded
vacuum chamber. This connection must conform to
the requirements of a protective connection ac-
cording to EN 61010:
•CF flanges fulfill this requirement.
•For gauges with a KF flange, use a conductive
metallic clamping ring.
Caution
Caution: vacuum component
Dirt and damages impair the function of the vac-
uum component.
When handling vacuum components, take appro-
priate measures to ensure cleanliness and prevent
damages.
Caution
Caution: dirt sensitive area
Touching the product or parts thereof with bare
hands increases the desorption rate.
Always wear clean, lint-free gloves and use clean
tools when working in this area.

FRG-700 Inverted Magnetron Pirani Gauge
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WARNING
WARNING: electric arcing
Helium may cause electric arcing with detrimental
effects on the electronics of the product.
Before performing any tightness tests put the pro-
duct out of operation and remove the electronics
unit.
The gauge may be mounted in any orientation. To keep
condensates and particles from getting into the measur-
ing chamber preferably choose a horizontal to upright
position and possibly use a seal with a centering ring
and filter.
If adjustment should be possible after the gauge has
been installed, be sure to install it so that potentiometers
<HV> and <ATM> can be accessed with a screwdriver
(→"Adjusting the Gauge").
When making a CF flange connection, it can be ad-
vantageous to temporarily remove the electronics and
the magnet unit (→Instruction Manual tqna48e1).

FRG-700 Inverted Magnetron Pirani Gauge
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Remove the protective lid and connect the product to the vac-
uum system.
or
Protective lid
Clamp
Seal with
centering ring
Seal with centering
ring and filter
Keep the protective lid.