Endress+Hauser PROMAG 33, Operating Manual

Page: 77 / 126

Function group
SYSTEM PARAMETERS
POS. ZERO
RETURN
With this function the signals of current and pulse/frequency output can be set
to the fallback value, e.g. for interrupting the measurement for cleaning the
piping. After positive zero return is activated, the display shows the
message “S: POS. ZERO-RET. ACTIVE”.
Measured value suppression is equivalent to zero flow. During this time the
following applies:
•
Current output
→
set to 0 mA or 4 mA
•
Pulse/frequency output
→
at the fallback value
•
Display flow = 0
•
The totalizer remains at the last applicable value.
Note!
•
This function has top priority above all other functions of the instrument.
Simulations are suppressed for example.
•
During positive zero return both relays (1 and 2) are live, i.e. energised.
Any error messages occurring, e.g. fault or alarm, can then only be called
up using the diagnosis function (
7
) or via the function “PRESENT SYSTEM
CONDITION”. These errors do not, however, affect the outputs.
•
If the Promag 33 measuring electronics are fitted with a communications
module “RS 485”, then positive zero return can also be activated using the
auxiliary input (see page 69).
6
OFF – ON
DEF.
PRIVATE CODE
This function enables a personal code number to be selected with which
programming can be enabled.
Note!
•
Programming is always enabled with the code number “0”.
•
When programming is locked this function is not available and access
to the personal code number by third parties is not possible. The code
number can only be altered when programming has been enabled.
6
max. 4-digit number: 0...9999
Factory setting:
33
Note!
Note!
Promag 33 6 Description of Functions
Hauser 77