Operating - TESTO 520 Mode D'emploi

Digital handheld pressure gauge
Operating instructions
Connection for pneu-
matic hoses 4/6 mm
Zero point setting
On/Off
3 1/2 digit LCD display
Higher/lower
measuring range
Freeze display
Measuring instrument conform to EC directive
2004/108/EEC. The instruments were tested in the
frequency range of 27 - 500 MHz. The specified
parameters cannot be guaranteed in the named
frquency range.
Description
The Testo handheld pressure gauge testo 520 is a digital pressure
measuring instrument with integrated pressure sensor for the mea-
surement of differential or relative pressures. Its 3 1/2 digit LCD
display and high precision render it suitable for a wide range of
applications.
Features
- Piezo-resistive pressure sensor
- Measuring range HI, class 0.2% F.S.
- Measuring range LO, class 0.5% F.S.
- For instrument air or non-corrosive gases
- measuring range changeover
- Large LCD display
- HOLD function
- Zero point setting
- Lo-Batt indication for battery change
- Facility for 9 V block battery or rechargeable battery
- Splash-proof ABS case (IP 54)
24 month warranty
Safety details
The pressure values in these operating instructions should not
be exceeded or the pressure sensor can be destroyed.
The instrument is not to be used in an explosive environment !
Ensure correct connection of the pneumatic hoses !

Operating

Pneumatic connections
Before making the pneumatic connection to the instrument, ensure
that no pressures can occur in the system which could exceed the
maximum overload capacity of the testo 520. The connections are
intended for direct connection to the measuring pipelines (hose,
internal diameter 4 mm, external diameter
6 mm). The 0 to 1/10 bar measuring range is always fitted with
NPT 1/8" connection unions.
P + higher pressure
- S lower pressure
Switching on and off
testo 520
Switching on/switching off
Setting the zero point
The measurement values can be falsified by a change in the
position of the measuring instrument. After zeroing, the position
of the measuring instrument must not be changed. Carry out
zeroing before every measurement in order to compensate faul-
ty positioning or long-term zero-point drift.
The zero point can be set with the knob located between the pres-
sure connections. Check the zero point before each measure-
ment. Keep ambient temperature.
Measuring range changeover
Press the HI/LO key. The measuring range changes. This is dis-
played by the shifting of the decimal point. Measuring range HI is
operative on switching ON.
HOLD function
By means of the HOLD key, the indicated measured value can be
´frozen´ on the display.
The symbol appears in the display.
Cancel the Hold function by pressing the HOLD key once more.
Battery changing
The appearance of ´BAT´ indicates that the battery capacity is
exhausted.
- Open battery compartment
- Fit 9 V alkali battery (IEC 6LR61) or rechargeable battery
Ensure correct polarity !
Dispose of the used battery correctly and according to environ-
mental regulations.
Specifications
Technical data
Measuring media
Units
Linearity, hysteresis and
repetition accuracy
Reference temperature
Temperature influence
Operating temperature
Storage temperature
Case protection class
Power supply
Current consumption
Battery life
Measuring rate
Display
Pneum. connection
Case dimensions
Weight incl. battery
press the key
Instrument air or inert gases
mbar
(other units available on request)
± 0,2 % F.S. ± 1 Digit
(measuring range HI)
± 0,5 % F.S. ± 1 Digit
(measuring range LO)
22 °C
± 0,05%/°C
0 °C to +60 °C
-30 °C to +85 °C
IP 54
9 V block battery or rechargeable
battery IEC 6LR61
approx.1.7 mA
approx. 250 h
3 measurements / s
3 1/2 digit LCD with sign
12.7 mm high
HOLD indication
LO BAT indication
Hose 4/6 mm, NPT 1/8 "
152x83x34/29 mm
250 g
Measuring ranges
Measuring range Type of Resolution max. display
(mbar) LO/HI pressure
LO/HI LO/HI
0 to 20.00/200.0 1) d,g 0.01/0.1 19.99/199.9
0 to 100.0/1000 1) d,g 0.1/1 199.9/1999
0 to 200.0/2000 1) d,g 0.1/1 199.9/1999
0 to 1.000/10.00* 2) d,g 0.001/0.01 1.999/19.99
* measuring ranges in bar
d = differential pressure g = relative pressure
1) max. static pressure = 7 bar
2) max. static pressure = 27 bar
Conversion factors
1 mbar = 0.1 kPa 1 mbar = 0.0145
1 mbar = 1 hPa 1 mbar = 0.4015
1 mbar = 0.0010 bar 1 mbar = 0.02953 inHg
1 mbar = 10.20 mmH2O 1 mbar = 0.7501
Maintenance
testo 520 does not require any maintenance. It can be cleaned
with a damp cloth. Do not use cleaning agents containing solvents
!
You are recommended to have the instrument recalibrated by the
supplier at least once per year.
Fault
Fault/ Possible
Indication Cause
BAT Battery voltage
under 7.3 V
No indication Battery discharged
Battery not
correctly installed
Instrument Sensor ageing
inaccurate
Zero point not set
Indicated value Excess pressure
does not change applied to
pressure sensor
Erroneous mea- Battery discharged
sured value and
simultaneously BAT
1_ _ _ Display range
exceeded
max. loading
capability(mbar)
1500
2000
3000
27000
psi
inH2O
mmHg
Remedy
Fit new battery
Fit new battery
Check
Recalibrate
Set zero point
Dispatch
instrument for
repair
Fit new battery
Set permissible
measured value or
measuring range