LEYBOLD THERMOVAC TTR 211 S User manual

Vacuum Pumps Instrumentation Fittings and Valves LEYBOLD VACUUM
TTR 211 S;TTR 211 S2
TTR 211 NPT
TTR 216 S
THERMOVAC Transmitter
Cat. No.
157 30; 164 30
157 32;
157 31
GA 09.216 / 2.02
Operating Instructions

Leybold Service
If equipment is returned to LEYBOLD, indicate whether the equipment
is free of substances damaging to health or whether it is contaminated.
If it is contaminated also indicate the nature of the hazard. LEYBOLD
must return any equipment without a Declaration of Contamination to
the sender’s address.
General Remarks
We reserve the right to alter the design or any data given in these Ope-
rating Instructions.The illustrations are not binding.
Contents Page
1 Description . . . . . . . . . . . . . . . . . . . . . . . . . . 3
1.1 General . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3
1.1.1 Purpose . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4
1.2 Technical data . . . . . . . . . . . . . . . . . . . . . . . . . 4
1.2.1 General data . . . . . . . . . . . . . . . . . . . . . . . . . . 4
1.2.2 Measurement system . . . . . . . . . . . . . . . . . . . 5
1.2.3 Signal output . . . . . . . . . . . . . . . . . . . . . . . . . 5
1.2.4 Switching threshold . . . . . . . . . . . . . . . . . . . . . 5
1.2.5 Control input . . . . . . . . . . . . . . . . . . . . . . . . . . 6
1.2.6 Status display . . . . . . . . . . . . . . . . . . . . . . . . . 6
1.2.7 Monitor output . . . . . . . . . . . . . . . . . . . . . . . . 6
1.2.8 Mechanical data . . . . . . . . . . . . . . . . . . . . . . . 6
1.2.9 Ambient conditions . . . . . . . . . . . . . . . . . . . . . 6
1.3 Technical description . . . . . . . . . . . . . . . . . . . . 6
1.4 Equipment . . . . . . . . . . . . . . . . . . . . . . . . . . . 7
1.4.1 Supplied equipment . . . . . . . . . . . . . . . . . . . . 7
1.4.2 Accessories . . . . . . . . . . . . . . . . . . . . . . . . . . 7
Page
2 Operation . . . . . . . . . . . . . . . . . . . . . . . . . . . 8
2.1 Installation of the TTR 211 S; TTR 211 S2;
TTR 211 NPT;TTR 216 S . . . . . . . . . . . . . . . . 8
2.2 Electrical connection . . . . . . . . . . . . . . . . . . . 10
2.2.1 Power supply . . . . . . . . . . . . . . . . . . . . . . . . 12
2.2.2 Measurement signal output . . . . . . . . . . . . . . 12
2.2.3 Switching threshold . . . . . . . . . . . . . . . . . . . . 12
2.2.4 Monitor output . . . . . . . . . . . . . . . . . . . . . . . . 14
2.2.5 Switching over the chart recorder output . . . . 14
2.2.6 Identification . . . . . . . . . . . . . . . . . . . . . . . . . 14
2.3 Start-up . . . . . . . . . . . . . . . . . . . . . . . . . . . . 15
2.3.1 Operation . . . . . . . . . . . . . . . . . . . . . . . . . . . 15
2.3.2 Measurement system status indication . . . . . 15
2.4 Troubleshooting . . . . . . . . . . . . . . . . . . . . . . 15
3 Maintenance . . . . . . . . . . . . . . . . . . . . . . . . 16
3.1 LEYBOLD service . . . . . . . . . . . . . . . . . . . . . 16
3.2 The operating electronics . . . . . . . . . . . . . . . 16
3.3 The sensing cell . . . . . . . . . . . . . . . . . . . . . . 16
3.3.1 Cleaning the sensing cell . . . . . . . . . . . . . . . 16
3.3.2 Exchanging the sensing cell . . . . . . . . . . . . . 17
3.3.3 Alignment of the sensing cell . . . . . . . . . . . . . 18
4 Spare parts list . . . . . . . . . . . . . . . . . . . . . . 18
Annex 1 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 19
Annex 2 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 21
2
2GA 09.216/2.02 - 02/96

1 Description
1.1 General
The THERMOVAC transmitter TTR 211 S, TTR 211 S2,
TTR 211 NPT and TTR 216 S is supplied ready for ope-
ration. Even so, we recommend to read these Operating
Instructions with care so as to ensure optimum operating
conditions right from the start.
These Operating Instructions contain important informa-
tion on the functions, installation, start-up, operation and
troubleshooting of the THERMOVAC transmitters
TTR 211 S, TTR 211 S2, TTR 211 NPT and TTR 216 S.
Important remarks concerning operational safety and
protection are emphazised as follows:
Warning Indicates procedures that must be strict-
ly observed to prevent hazards to per-
sons.
Caution Indicates procedures that must strictly
be observed to prevent damage to, or
destruction of the TTR 211 S, TTR 211
S2, TTR 211 NPT and TTR 216 S.
Note
Indicates special technical requirements that the user
must comply with.
The references to diagrams, e.g. (4/1), consist of the Fig.
No. and the item No. in that order.
Unpack the TTR 211 S, TTR 211 S2, TTR 211 NPT and
TTR 216 S immediately after delivery, even if it is to be
installed at a later date.
Examine the packaging for any external damage.
Completely remove all packaging materials.
Note
Retain the shipping container and the packaging materi-
als in the event of complaints about damage.
Check that the TTR 211 S, TTR 211 S2, TTR 211 NPT
and TTR 216 S is complete (see Section 1.4).
Carefully examine the TTR 211 S,TTR 211 S2, TTR 211
NPT and TTR 216 S visually.
If any damage is discovered, report it immediately to the
forwarding agent and insurer. If the damaged part has to
be replaced, please get in touch with the orders depart-
ment.
3
3
GA 09.216/2.02 - 02/96

1.1.1 Purpose
The THERMOVAC transmittersTTR 211 S,TTR 211 S2,
TTR 211 NPT and TTR 216 S are compact active pres-
sure converters housing a Pirani measurement system
as well as the corresponding operating electronics.
They are particularly well suited for integration into sy-
stems and offer a measurement range of 5·10-4 to 1000
mbar.
The transmitter is connected directly to the vacuum
system through its DN 16 KF or 1/8“ NPT flange.
The electrical connection is provided through a screened
8-way FCC 68 connector.
Moreover, the technical data as published in Section 1.2
must be observed.
1.2 Technical Data
1.2.1 General Data
Measurement range 5·10-4 to 1·103mbar
Measurement uncertainty
Deviation from the characteristic
 ± 20 % in the range from 1·10 -3 to 1·10-2 mbar
± 15 % in the range from 1·10-2 to 30 mbar
± 50 % in the range from 30 to 1000 mbar
Average temperature coefficient
of the output span < 1 % / K of the displayed value
Reproducibility < 5 % of the displayed value
Measurement principle
thermal conductivity according to Pirani
Supply voltage 14.5 to 36 V DC; typ. 24 V DC
Ripple ≤2 Vpp
in the range from 17 to 32 V
Power consumption < 2 W
Protection IP 40
Electrical connection 8-way FCC 68 socket
with screen
Cable length 100 m max. (dia. 0.14 mm2)
Flammability UL 94 - V2
4
4GA 09.216/2.02 - 02/96

CE
- Electrical safety DIN EN 61 010, Part 1,
corresponding to VDE 0411 Part 1, bzw. IEC 1010-1
- Emission of interferences EN 50081, Part 1, Limit B
- Immunity to interferences EN 50082, Part 2, Level III
1.2.2 Measurement System
Measurement system exchangeable
Filament tungsten (TTR 211 S, TTR 211 S2,
TTR 211 NPT)
or platinum (TTR 216 S)
Flange connection DN 16 KF or 1/8“ NPT
Degassing temperature 80 °C max. at the flange
Dead volume 11 cm3approx.
Materials in contact with the medium
TTR 211 S / 211 S2 aluminium, nickel-plated steel,
VACON, tungsten, CrNi 8020;
glass, epoxy cement
TTR 211 NPT stainless steel, tungsten, glass
VACON, CrNi 8020, epoxy cement
TTR 216 S stainless steel, CrNi, Al2O3ceramics,
NiFe, Mo, Ni, platinum
Overpressure tolerance
TTR 211 S / 211 S2;TTR 211 NPT 3 bar abs.
TTR 216 S 10 bar abs.
1.2.3 Signal Output
Signal output 0 to 10.6 V
Permissible load resistance Ra≥10 kOhm
Measurement signal 1.9 V to 10 V;
corresponding to 5·10-4 to 1·103mbar
logarithmic, 1.286 V per decade
Status signal broken filament 10.5 V
1.2.4 Switching Threshold
Switching threshold 1 normally open relay contact
Switching threshold 2 (TTR 211 S2)
changeover relay contact
Adjustment range about 1·10-3 to 500 mbar
Hysteresis about + 30 % of the adjusted pressure value
Contact rating 1 60 V; 0.5 A DC
Contact rating 2 60 V; 0.5 A DC
250 V; 3 A AC
Error status open contact or rest position
for broken filament
or switched off supply voltage
5
5
GA 09.216/2.02 - 02/96

1.2.5 Control Input
Input resistance RE≈100 kOhm approx.
(see Fig. 3 and Section 2.2.5)
Chart recorder output switchover
Measurement signal output UE≈11 to 12 V
or open input
Switching threshold adjustment UE≈0 to 1 V
1.2.6 Status Display
Operation (power)
Switching threshold (not activated) two-colour LED
shining orange
Switching threshold (activated) two-colour LED
shining green
1.2.7 Monitor Output
3.5 mm jack socket for accessing the measurement sig-
nal and switching threshold setting (see Section 2.2.4).
1.2.8 Mechanical Data
Dimensions (WxHxD) in mm
for TTR 211 S / 211 S2; TTR 216 S 73 x 106 x 56
for TTR 211 NPT 73 x 121 x 56
Weight 200 g approx.
1.2.9 Ambient Conditions
Storage temperature range - 20 °C to + 70 °C
Climatic rating KWF to DIN 40040
Operating temperature 10 °C to 50 °C
Max. rel. humidity on 30 days per year,
non-condensing 95 %
1.3 Technical Description
The THERMOVAC utilizes the thermal conductivity of
gases for the purpose of vacuum pressure measurement
(Pirani principle). The temperature of the filament which
is used is maintained at a constant level by an electronic
control circuit. Thus the sensor may respond quickly to
any pressure changes. The specially designed tempera-
ture compensation circuitry significantly improves tem-
perature stability of the measured pressures in the use-
ful measurement range from 5·10-4 mbar to atmospheric
pressure.An internal voltage regulator permits operation
off a wide supply voltage range with low requirements
(2 Vpp ripple).
6
6GA 09.216/2.02 - 02/96

The built-in trigger level is easily adjustable over a range
from 1·10-3 to 500 mbar.The switching function is availa-
ble through a relay contact. A LED is provided for indica-
tion of the switching function.
TheTTR 211 S2 is equipped with an additional switching
threshold which is accessible through an additional set of
relay contacts.
The TTR 211 S, TTR 211 S2, TTR 211 NPT and TTR
216 S supplies a logarithmic output of the vacuum pres-
sure by means of a voltage signal ranging from 1.9 to 10
V which can easily be subjected to further processing. A
control signal may also be applied to read out the current
threshold setting via the signal output.
The threshold setting may also be checked through an
additional monitor output where a voltmeter may be con-
nected, for example. The measurement signal is also
continuously available at this output for testing purposes.
The low impedance output amplifier permits the connec-
tion of long cable runs.
Faults in the sensor, such as a broken filament, for exam-
ple can be detected at the signal output by way of a sta-
tus message. In the event of a fault, the switching thres-
hold relay is returned to its rest position.
1.4 Equipment
1.4.1 Supplied Equipment
Cat. No.
THERMOVAC transmitter TTR 211 S 157 30
THERMOVAC transmitter TTR 211 S2 164 30
THERMOVAC transmitter TTR 211 NPT 157 32
THERMOVAC transmitter TTR 216 S 157 31
Operating Instructions GA 09.216
Jack plug (3.5 mm)
1.4.2 Accessories
Cat. No.
Replacement sensing cell for TTR 211 S 157 75
Replacement sensing cell for TTR 211 S2 157 75
Replacement sensing cell for TTR 211 NPT 896 34
Replacement sensing cell for TTR 216 S 157 77
10 m long connection cable with
two FCC 68 plugs, screened 157 33
FCC 68 plug / screw terminal adapter
fitted on top hat rail for
cabinet installation in preparation
DN 10/16 KF clamping ring 183 41
DN 16 KF (Al) centering ring 183 26
7
7
GA 09.216/2.02 - 02/96

For overpressure operation and degassing
(TTR 216 S only):
Ultra sealing disc (3 pcs.) 883 75
Clamping ring for ultra sealing discs 882 75
2 Operation
Check the technical data first to see whether the trans-
mitter is suited for your particular application.
2.1 Installation of the TTR 211 S;
TTR 211 S2;TTR 211 NPT;
TTR 216 S
The THERMOVAC transmitters TTR 211 S, TTR 211 S2,
TTR 211 NPT and TTR 216 S should preferably be
mounted flange down.Inclined installation is possible but
the horizontal orientation must not be exceeded.
Flange up installation is not permissible because under
such circumstances condensate may collect in the
TTR 211 S, TTR 211 S2, TTR 211 NPT and TTR 216 S.
This will either adversely affect the measurements, or the
transmitter may possibly be damaged.
The THERMOVAC transmitter is equipped with a DN 16
KF or a 1/8“ NPT connection flange which is used to
connect the transmitter to the mating connection flange
on a vacuum system with the aid of a centering ring and
a clamping ring.
For the dimensional drawing, see Fig. 1.
8
8GA 09.216/2.02 - 02/96

9
9
GA 09.216/2.02 - 02/96
73
121
16
13
1/8" NPT
92
106
7
56
DN 16 KF
Trigger
0
Fig. 1 Dimensional drawing for TTR 211 S and TTR 211 NPT

2.2 Electrical Connection
The electrical connection for the THERMOVAC transmit-
ters is provided through an 8-way FCC 68 connector
which links the transmitter to the corresponding opera-
ting unit.
The pinout is given in Fig. 2.
Pin Signal Designation
on the rear
Pin 1 Supply voltage
14.5 V to 36 V DC + 24 V DC
Pin 2 0 V supply; used as the ground
reference for the supply and
control signal voltages. COMMON
Pin 3 Pressure dependant
logarithmic signal output SIGN 0 - 10 V
Pin 4 „TM transmitter“ identification
code (27 kOhm) IDENT
Pin 5 Signal ground (used only for
the pressure signal) SIGN COM
Pin 6 Switch contact 1 TRG
Pin 7 Chart recorder switchover
(control input) SIGN CTRL
Pin 8 Switch contact 2 TRG
Note
Signal ground (pin 5) and power supply ground (pin 2)
are internally linked by a 10 Ohm resistor. For this also
refer to the block diagram of Fig. 3.
Two examples of how to connect the TTR 211 S,
TTR 211 S2, TTR 211 NPT and TTR 216 S are given in
Annex 2.
10
10 GA 09.216/2.02 - 02/96
Pin 1
Fig. 2 Connection socket

11
11
GA 09.216/2.02 - 02/96
+ 10,5 V
Fig. 3 Block diagram
27 kΩ
10 Ω
4
5
3
1
6
7
2
8
Sensor
Characteristic
adaptation
Trigger
Broken filament
LED
Trigger
LED „POWER“
Power supply
Switching threshold
Switching threshold
Power supply ground
Identification
Signal ground
Signal output
Control input

2.2.1 Power Supply
Warning The THERMOVAC transmitter
TTR 211 S, TTR 211 S2, TTR 211 NPT
and TTR 216 S may only be connected
to supply units or measuring instruments
which meet the requirements of mains
isolated extra-low voltages (PELV) and
VDE 0100.
The THERMOVAC transmitter TTR 211 S, TTR 211 S2,
TTR 211 NPT and TTR 216 S is capable of operating off
supply voltages ranging from 14.5 V to 36 V (regulated)
or 17 to 32 V supplies with a max. ripple of ≤2 Vpp.A
supply voltage of 24 V DC is recommended.
The power supply must be connected to Pin 1 (+) and
Pin 2 (power supply ground).
2.2.2 Measurement Signal Output
The TTR 211 S, TTR 211 S2, TTR 211 NPT and
TTR 216 S supplies a defined output signal ranging from
1.9V to 10 V at Pin 3 with reference to Pin 5 which is sig-
nal ground. In the case of a broken filament the signal is
raised to a level of about 10.5 V. Via the measurement
signal output it is also possible to directly switch the high
tension on and off automatically in a PTR 225 / PTR 237
PENNING transmitter.This occurs at a pressure of about
5·10-3 mbar. For this also refer to Table 1 in Annex 1.
Table 1 has been included to clarify the relationship be-
tween the output voltage and the pressure.
Note
The measurement signal provided by the THERMOVAC
transmitter depends on the type of gas.The values sta-
ted in Table 1 apply to nitrogen and air. For other gases,
corresponding correction factors must be used which are
available from LEYBOLD upon request.
2.2.3 Switching Threshold
The built-in switching threshold can be adjusted by
means of potentiometer (4/5) or (5/2) in the range be-
tween 1·10-3 to 500 mbar.
To adjust the switching threshold, remove the cap and
adjust this potentiometer to the desired value by using a
screwdriver.
To check the setting you may connect a voltmeter to the
monitor output (4/3) or (5/1) (see Section 2.2.4 andTable
1 in the Annex), or you may switch over the chart recor-
der output (see Section 2.2.5).
Note
In the access path to the potentiometer marking dots
(4/6) are provided as a visual aid.The distance between
two marking dots approximately corresponds to one
decade of pressure.
12
12 GA 09.216/2.02 - 02/96

The switching threshold function is available through a
floating relay contact (normally open) at Pin 6 and Pin 8.
The switching action is indicated by a LED (4/1) which
changes its colour from „orange“ to „green“ when the
pressure drops below the adjusted threshold.
The second switching threshold is available at the elec-
trical connection (5/4) by means of a floating changeover
contact.When active, LED (5/3) comes on.
13
13
GA 09.216/2.02 - 02/96
2
134 5 6
4 Potentiometer for full scale
alignment
5 Potentiometer for adjust-
ment of the switching
threshold
6 Marking dots
Key to Fig. 4
1 Two-colour LED
orange: operation (power)
green: switching threshold
has been activated
2 Potentiometer for Zero
alignment
3 Monitor output
(3.5 mm jack socket)
Fig. 4 THERMOVAC transmitter TR 211 NPT - front view
Trigger
1
4
Fig. 5 THERMOVAC transmitter TTR 211 S2
Key to Fig. 5
1 Monitor output
2 Potentiometer for
adjustment of the
switching threshold
3 LED (green)
4 Connection plug
Pin 1 Ground
Pin 2 Normally open
Pin 3 Center contact
Pin 4 Normally closed
1
2
3
4

2.2.4 Monitor Output
The monitor output (4/3) or (5/1) is accessible through a
3.5 mm jack socket so that the measurement signal and
the trigger setting may be measured. The stereo jack
plug which is included with the instrument may be used
to connect a voltmeter, for example.For this also refer to
Fig. 6.
2.2.5 Switching over the Chart Recorder
Output
By applying a control voltage to Pin 7 it is possible to
switchover the chart recorder output for outputting the
voltage for the switching threshold setting.
Pin 2 must be used as the reference potential.
The chart recorder output is switched over for outputting
the switching threshold voltage either by linking pins 7
and 2 or by applying a voltage ranging between 0 and 1
V to Pin 7.
The measurement signal is output through the chart
recorder output when there is no link between pins 7 and
2 (open input) or by applying a voltage ranging between
11 and 12 V to Pin 7.
2.2.6 Identification
For the purpose of identifying the type of connected
transmitter and the pressure range, the THERMOVAC
transmitter is equipped with an identification resistor
(R = 27 kOhm) between Pin 4 and Pin 2. This resistor
may be sensed by connected operating or control units
so that these can automatically adapt.
14
14 GA 09.216/2.02 - 02/96
Fig. 6 Jack plug for the monitor output
Measurement
signal
Value for the trigger threshold

2.3 Start-up
Connect the THERMOVAC transmitter TTR 211 S,
TTR 211 S2, TTR 211 NPT and TTR 216 S according to
Section 2.1 and 2.2.
2.3.1 Operation
Apply a supply voltage of 14.5 to 36 V to the transmitter
(see Section 2.2.1).
LED (4/1) lights up in an orange colour.
Now the transmitter is ready to make measurements.
Status message:
LED lights up in an orange colour (green/red):
- The switching threshold has not been activated.
LED lights up in a green colour:
- The switching threshold has been activated according
to its pre-set value.
2.3.2 Measurement System Status
Indication
Proper operation is indicated by the presence of a pres-
sure dependant output signal for the pressure range
from about 5·10-4 mbar right up to the upper range limit
of 1000 mbar.
In the case of a broken filament the measurement signal
is raised to 10.5 V and the relay contact is returned to its
rest position (open).
2.4 Troubleshooting
LED off.
Possible cause: Supply voltage is missing.
The measurement signal is always greater than 10 V
even when the pressure is considerably lower than
103mbar.
Possible cause: Broken filament.
Remedy: Exchange the sensing cell.
For this refer to Section 3.3.2.
At atmospheric pressure (system vented) the mea-
surement signal level is not correct.
Possible cause: Misalignment.
Remedy: Align the transmitter.
For this refer to Section 3.3.3.
The measurement signal level deviates from 1.9 V
although the pressure is below 5·10-4 mbar.
Possible cause: Misalignment.
Remedy: Align the transmitter.
For this refer to Section 3.3.3.
15
15
GA 09.216/2.02 - 02/96

3 Maintenance
3.1 LEYBOLD Service
If equipment is returned to LEYBOLD, indicate whether
the equipment free of substances damaging to health or
whether it is contaminated.If it is contaminated also indi-
cate the nature of the hazard. For this you must use a
form which has been prepared by us which we will pro-
vide upon request.
A copy of this form is reproduced at the end of these
Operating Instructions: „Declaration of Contamination of
Vacuum Instruments and Components“.
Please attach this form to the equipment or enclose it
with the equipment.
This Declaration of Contamination is required to meet
German Law and to protect our personnel.
LEYBOLD must return any equipment without a „Decla-
ration of Contamination“ to the sender’s address.
3.2 The Operating Electronics
The electronics assembly of the THERMOVAC transmit-
ters TTR 211 S, TTR 211 S2, TTR 211 NPT and TTR
216 S does not require any maintenance.
3.3 The Sensing Cell
3.3.1 Cleaning the Sensing Cell
The sensing cell is preferably cleaned by using organic
solvents (petrolether, ether or similar).
Note
The cleaning agent CCl4is not suitable for cleaning the
TTR 211 S / 211 S2 or theTTR 211 NPT where the feed-
through is glued in place. The adhesive used will not
resist exposure to CCl4for a longer period of time.
The sensing cell must not be cleaned by mechanical
means (like brushes, for example) since this will damage
the sensitive filament. The cleaning agent should be
injected into the sensing cell by means of a syringe and
left there for some time. Do not shake!
After the cleaning agent has been poured out, rinse once
or twice again. It is possible that the measurements
made in the range below 10-2 mbar with be to high for a
short while.
After having cleaned and let the sensing cell to dry, eva-
cuate it down to a pressure of under 5·10-4 mbar. The
measurement output signal must then drop to below
16
16 GA 09.216/2.02 - 02/96

5·10-4 mbar. If this is not the case, you must realign the
transmitter; see Section 3.3.3.
3.3.2 Exchanging the Sensing Cell
In order to exchange the sensing cell (in the event of a
broken filament or a contaminated sensor) it is required
to open the housing first.
Note
In lid (7/3) there are catches which must engage in the
slots (7/5) of the housing so that the housing sections
are firmly attached.
- To open the lid (7/3) use a screwdriver to press the cat-
ches (7/5) in their slots back, and pull off the lid.Disen-
gage the lid from the upper catches (7/2).
- Pull the inlay plate (7/4) out.
- Pull out the electronics assembly together with the sen-
sing cell from the housing.
- Pull the sensing cell off from the electronics assembly.
- Exchange the sensing cell.
Note
- When reassembling sensing cell and electronics as-
sembly, polarity of the pins on the sensing cell will not
have to be observed.
17
17
GA 09.216/2.02 - 02/96
1
2
4
3
Key to Fig. 7
1 Housing
2 Catches
3 Lid
4 Inlay panel
5 Slots
5
Fig. 7 Side view of the TTR 211 S

- When reassembling the transmitter make sure that the
rubber compression piece for the temperature sensor
is present, the insulation disk has been placed on the
cell and that the insulating plate between electronics
and upper housing section is in place.
To reassemble proceed in the reverse order as for dis-
assembly.
The transmitter electronics must be aligned to take
account of the new sensing cell. See Section 3.3.3.
3.3.3 Alignment of the Sensing Cell
Ageing and contamination of the filament will impair
accuracy of the pressure readings obtained.For this rea-
son it is recommended to align the transmitter as requi-
red or after having exchanged the sensing cell.
The alignment process is run as follows:
Remove the cap for potentiometers (4/2) and (4/4) from
the housing.
Connect a voltmeter set to the 0 to 10 V range to the
monitor output (4/3).
Vent the vacuum system and adjust the potentiometer
(4/4) for full scale alignment so that the voltmeter reads
10 V.
Next evacuate the vacuum system down to a pressure
below 5·10-4 mbar and adjust the Zero alignment poten-
tiometer (4/2) so that the voltmeter reads 1.9 V.
Vent the vacuum system and check full scale alignment
once more. Any possibly present deviation must be cor-
rected through potentiometer (4/4) for full scale align-
ment.
If is was necessary to correct full scale alignment, the
Zero alignment should be repeated.
After the alignment process has been completed put the
caps (4/2) and (4/4) back in place.
4 Spare Parts List
Ref. No.
Housing, complete with lid and inlay panel 200 61 598
Cap 200 27 544
Compression rubber piece 200 28 397
Replacement sensing cell for
TTR 211 S / TTR 211 S2 (DN 16 KF) 157 75
Replacement sensing cell for
TTR 211 NPT (1/8“ NPT) 896 34
Replacement sensing cell for
TTR 216 S (DN 16 KF) 157 77
18
18 GA 09.216/2.02 - 02/96

GA 09.216/2.02 - 02/96
Annex 1
Table 1 Relationship between output voltage and pressure
19
19
U (Out) Pressure
[V] [mbar]
————————————
1.9 5.00E-04
2 5.99E-04
2.1 7.17E-04
2.2 8.57E-04
2.3 1.03E-03
2.4 1.23E-03
2.5 1.47E-03
2.6 1.75E-03
2.7 2.10E-03
2.8 2.51E-03
2.9 3.00E-03
3 3.59E-03
3.1 4.30E-03
3.2 5.14E-03
3.3 6.15E-03
3.4 7.35E-03
3.5 8.80E-03
3.6 1.05E-02
3.7 1.26E-02
3.8 1.51E-02
3.9 1.80E-02
4 2.15E-02
U (Out) Pressure
[V] [mbar]
————————————
4.1 2.58E-02
4.2 3.08E-02
4.3 3.69E-02
4.4 4.41E-02
4.5 5.27E-02
4.6 6.31E-02
4.7 7.54E-02
4.8 9.02E-02
4.9 1.08E-01
5 1.29E-01
5.1 1.54E-01
5.2 1.85E-01
5.3 2.21E-01
5.4 2.64E-01
5.5 3.16E-01
5.6 3.78E-01
5.7 4.52E-01
5.8 5.41E-01
5.9 6.47E-01
6 7.74E-01
6.1 9.26E-01
6.2 1.11E+00
U (Out) Pressure
[V] [mbar]
————————————
6.3 1.32E+00
6.4 1.58E+00
6.5 1.90E+00
6.6 2.27E+00
6.7 2.71E+00
6.8 3.24E+00
6.9 3.88E+00
7 4.64E+00
7.1 5.55E+00
7.2 6.64E+00
7.3 7.94E+00
7.4 9.50E+00
7.5 1.14E+01
7.6 1.36E+01
7.7 1.63E+01
7.8 1.94E+01
7.9 2.33E+01
8 2.78E+01
8.1 3.33E+01
8.2 3.98E+01
8.3 4.76E+01
8.4 5.70E+01
U (Out) Pressure
[V] [mbar]
————————————
8.5 6.81E+01
8.6 8.15E+01
8.7 9.75E+01
8.8 1.17E+02
8.9 1.39E+02
9 1.67E+02
9.1 2.00E+02
9.2 2.39E+02
9.3 2.85E+02
9.4 3.41E+02
9.5 4.08E+02
9.6 4.89E+02
9.7 5.84E+02
9.8 6.99E+02
9.9 8.36E+02
10 1.00E+03

20
20 GA 09.216/2.02 - 02/96
Equation:
U(a) = [ lg (p/mbar) · 1.286 + 6.143 ] Volt
Pressure p / mbar
Output voltage U(a) / Volt
Characteristic TTR 211 S / 216 S