Leybold TTR 101 series vacuum transmitter

Product positioning and model differentiation

The Leybold THERMOVAC TTR 101 series is a dual sensor composite vacuum transmitter used for clean gas vacuum measurement. There are three models in total:

TTR 101: Basic type, no switch output, optional display screen

TTR 101 S2: with 2 programmable switch points (SP1/SP2)

TTR 101 PB: with Profibus DP communication+2 switch points

Vacuum interface: DN 16 ISO-KF/⅛ “NPT

Core technical parameters

Measurement performance

Parameter indicators

Measurement range 5 × 10 ⁻⁵… 1500 mbar

Measurement principle 5e-5~1 mbar: Pirani; 10-1500 mbar: capacitor film

Accuracy (N ₂) 950-1050 mbar: ± 2.5%; 100～950 mbar：±5%

Repetitive accuracy ± 2% (1e-3~1100 mbar)

Response time<30 ms

Output signal 0~10.23 V logarithmic output, 1.286 V/decade doubling

Electrical and Environmental

Parameter indicators

Supply voltage+15…+30 VDC (Class 2/LPS)

Power consumption without Profibus: ≤ 2.5 W; With Profibus: ≤ 3 W

Switch capacity<30 VAC/DC, ≤ 0.3 A (resistive)

Working temperature+10…+50 ℃

Storage temperature -20…+65 ℃

Protection level IP40

Weight<120 g (without bus); <250 g (with Profibus)

Gas correction factor (Pirani segment<1 mbar)

table

Gas coefficient C Gas coefficient C

H ₂/Water Vapor 0.5 Air/N ₂/O ₂ 1.0

He 0.8 Ar 1.7

CO₂ 0.9 Kr 2.4

Working principle

High voltage section (10-1500 mbar): Only capacitive thin film sensors are used, regardless of the type of gas

Low pressure section (5e-5~1 mbar): only use Pirani sensor, gas correction required

Intermediate section (1-10 mbar): Dual signal proportional fusion output

Installation requirements

Vacuum connection

Maximum pressure resistance: 5 bar (absolute pressure), burst pressure 10 bar

Installation direction is arbitrary, it is recommended to prevent condensation from entering horizontally/vertically

Conductive clamps must be used for reliable grounding, following EN 61010

electrical connection

Standard version: 8-pin FCC 68 connector

Profibus version: 9-pin D-Sub, speed * * ≤ 12 Mbaud * *, address 0-125

Shielded wire single ended grounding to avoid ground loop interference

Safety taboos

Prohibition of measuring flammable and explosive mixed gases containing oxidants

Ceramic sensors have poor impact resistance and are strictly prohibited from falling or bumping

Operation and Display

Status LED

ST green light: measurement mode

ST red light/flashing: malfunction

SP1/SP2 green light: switch closed

LCD display

Real time pressure, unit, measurement principle, switch status

Fault code: FAIL PIR1/CAP1/EEPROM/SENSOR

Switch function (S2/PB version)

Setting range: 5e-5~1500 mbar

Delay: 10% threshold

Mode: Low trigger/High trigger/Dual point trigger (only Profibus can be set)

Calibration and maintenance

Two-point calibration

ATM calibration: Atmospheric pressure>100 mbar, calibrated to 1000 mbar

HV calibration: Vacuum<1e-5 mbar, calibrated to 5e-5 mbar

Maintain rules

Drift caused by pollution requires regular calibration

Filaments and sensors are consumables and are not covered by warranty

Users are prohibited from disassembling and repairing the machine, otherwise the warranty will become invalid

Sensor replacement

Loosen the 2mm hex socket screw, insert and remove it vertically, and do not twist it

After replacement, recalibration is necessary

Troubleshooting (key)

Possible causes and solutions for the fault phenomenon

Output=0V, ST red light sensor/cable fault check, restart, replace sensor

FAIL PIR1 Pirani malfunction sensor replacement

FAIL CAP1 capacitor diaphragm fault, replace sensor

FAIL EEPROM storage failure, restart invalid, return to factory

Key questions and answers

What measurement principle does the TTR 101 series use, and which sensors are used for different ranges?

Answer: Adopting Pirani+capacitance film dual sensor composite measurement; Use Pirani sensors for 5 × 10 ⁻⁵~1 mbar, capacitive thin film sensors for 10~1500 mbar, and dual signal fusion range for 1~10 mbar.

How to calibrate TTR 101 and what two conditions must be met?

Answer: Perform two-point calibration: ① ATM calibration needs to be completed at atmospheric pressure>100 mbar; ② HV calibration needs to be completed under vacuum<10 ⁻⁵ mbar; After calibration, it is necessary to confirm that the output of approximately 4.85 × 10 ⁻⁵ mbar is normal.

What is the core difference between TTR 101 S2 and TTR 101 PB, and what are the limitations of the switch output?

Answer: S2 is a 2-channel switch version, PB adds Profibus DP communication; The switch is a solid-state relay, rated * *<30V, ≤ 0.3A * *, with a fixed hysteresis threshold of 10%. The dual point trigger mode can only be set through Profibus.