KELLER LEO 3 Digital Pressure Gauge with Fast Peek Function Instruction Manual
- June 9, 2024
- KELLER
Table of Contents
KELLER LEO 3 Digital Pressure Gauge with Fast Peek Function
Instruction
Intelligent Transmitter with Digital Indication
Description
LEO3 is a micro-processor based pressure transmitter with digital double-
display for the actual pressure and for the output signal (or for Min.-/Max.
pressure).
The technical data of this product can be taken from the corresponding data
sheet or from the
agreed specifications.
Turn-On and Functions
LEO3 has two operating keys. The left key (SELECT) serves to select the functions and the pressure units. The right key (ENTER) activates the selected function or pressure unit. The right key is also used to switch between the analog pressure value, the Min.- and the Max. pressure value.
Turn-on:
LEO3 will turn on automatically when connecting it to an external supply. The
instrument first displays the full-scale pressure range (top display) and the
soft-ware version (year/week). The instrument is then ready for use and
indicates the actual pressure (top display) and the current of the analog
output (bottom display).
The instrument has the following functions:
RESET:
Min.-/Max.-value are set to the actual pressure.
MANO:
Releases the following functions:
ZERO SET:
Sets a new pressure zero reference.
ZERO RES:
Sets the pressure zero to factory setting.
…followed by the unit selection: bar, mbar/hPa, kPa, MPa, PSI, kp/cm2
OUTP SETT:
Opens the menu for the configuration of the analog-output.
CODE:
Press: 2 x Select / enter /Select / enter.
If the right code is set (22), the following functions will be re leased:
ZERO:
Sets the analog output at actual pressure to 4,0 mA.
FS:
Sets the analog output at actual pressure to 20,0 mA.
FACT SETT:
Sets the analog output back to factory settings.
Example:
Example: Setting a new Zero Reference:
- Turn on LEO3 (connection to an external supply).
- Wait for the instrument’s measuring mode (≈ 3 s).
- Press the SELECT-key 2 times: MANO appears.
- Press ENTER: ZERO SET appears.
- Press ENTER: The new Zero reference is set. The instrument returns to the measuring mode.
Display of the Minimum or Maximum Value
When in the measuring mode (Display: Actual pressure and analog output
signal), you may display the Min. pressure value for 5 seconds by shortly
pres-sing the ENTER-key. Pressing it again displays the Max. pressure value
for 5 seconds.
Notes
- The functions and units can also be called up by keeping the SELECT-key depressed. Releasing the key enables the displayed function or unit to be activated with the ENTER-key.
- If the selected function or unit is not activated within 5 seconds with the ENTER-key, LEO3 returns to the measuring mode without changing any settings. Exception: Functions for the analog output.
- Disconnecting LEO3 from the power supply does not influence any of the previous settings.
- If a pressure can not be re-presented on the display or the analog output goes be-yond the lowest (3,8 mA) or highest (20,4 mA) limit, UFL (underflow) or OFL (over-flow) appears on the display.
- If the actual pressure goes beyond the measuring range, the last valid pressure value starts flashing on the display (overload warning).
- If ERR appears on the upper display, it’s an indication that the instrument is malfunctioning. The instrument must be repaired.
- Temperatures outside of 0…50 °C could impair the readability of the display.
Interface (RS485)
The RS485 interface and a KELLERspecific PCsoftware allow the programming of
the measuring range for the ana-log output without applying any pressure. It
also enables the read-out of the actual measu-ring values The corresponding PC
software can be found on our web site.
Installation
The installation must be carried out by qualified personnel only.
Screw the LEO3 into the female pressure port and tighten using the hexagon of
the transducer (pressure connection) (max. torque 50 Nm).
The transducer is secured to the housing by a lock nut.
Aligning the face:
Slacken the lock nut at the housing using two open-ended spanners. The display
of the LEO3 can now be rotated in relation to the transducer. Move the face to
the desired position and tighten the lock nut.
The LEO3’s display can be turned almost 180° to the left and right. The lid of the lower housing can then be opened.
ATTENTION: Turning the display more than 180° may damage the wires.
Ranges / Calibration
The ZERO-function allows to set any pressure value as a zero reference.
The factory setting of the pressure zero for the ranges ≤ 61 bar absolute is
at vacuum (0 bar absolute). For relative pressure measurements, activate «ZERO
SEt» at ambient pressure. Instruments > 61 bar absolute or instruments with a
relative pressure sensor (label marked with: Range: rel) are calibrated with
the zero at atmospheric pressure.
Plug Assignment Binder 723
- Pin 1: OUT / GND
- Pin 2: not connected
- Pin 3: +Vcc
- Pin 4: RS485A
- Pin 5: RS485B
Shield
General Safety Instructions
When installing and operating the digital manometer, attention should be paid
to the corresponding safety regulations.
Only mount the digital man-meter onto unpressurized systems.
On pressure ranges ≥ 61 bar, the pressure connections could show residual
hydraulic oil.
Please also note the corresponding data sheet.
Declaration of Conformity
The Declaration of Conformity to this product can be downloaded under www
.keller-druck.com
Accessories, Spare Parts
-
Interface Cable K114B (USB RS485)
Order Number 309010.0076 -
Interface Cable K107 (RS232 RS485)
(Europe) Order Number 309010.0003
(U.K.) Order Number 309010.0020
(USA) Order Number 309010.0021 -
Protective rubber covering /Order Number 309030.0002
-
Carrying bag Order Number 309030.0003
KELLER Druckmesstechnik AG
CH-8404 Winterthur
+41 52 235 25 25
[email protected]
KELLER Gesellschaft für Druckmesstechnik mbH
DE-79798 Jestetten
+49 7745 9214 0
[email protected]
Version | Edition
12/2022
www.keller-druck.com