KROHNE OPTIWAVE 400 Series Supplementary Instructions Manual page 28

SERVICE
4
PART 2: How to check the measurements (example procedure given)
• Find the data for the 4 mA and the 20 mA settings in the SIS specification.
• Push [^ ^ ^ ^ ] to start.
• Fill the tank to the maximum level (without overfill). Measure the level of the product in the
tank with an approved level measurement device (reference device).
• If the menu item menu item Current Out. 1 Var.
output current value is 20 mA. If the menu item Current Out. 1 Var.
"DISTANCE", make sure the output current value is 4 mA.
• Remove the product from the tank until it is 50% full. Measure the level of the product in the
tank with an approved level measurement device (reference device).
• Make sure the output current value is 12 mA.
• Remove the product from the tank to the minimum level. Measure the level of the product in
the tank with an approved level measurement device (reference device).
• If the menu item Current Out. 1 Var.
value is 4 mA. If the menu item Current Out. 1 Var.
the output current value is 20 mA.
If the current output values are correct, then the current output agrees with the measured
i
level of the product.
You can adapt this procedure to special conditions. For example, if you use the safety function to
prevent an overfill, it is not necessary to remove the product from the tank to the minimum level.
It is only necessary to measure the level and current output of the product in the tank when it is
full (without overfill) and 50% full.
CAUTION!
Do a visual inspection of the housing, seals and electrical wires to make sure that they are
serviceable.
Proof test coverage
Measurement signal
Current output 1
Table 4-1: Proof test coverage
28
Current Out. 1 Var. (C4.1.1) is set to "LEVEL", make sure the Current Out. 1 Var. Current Out. 1 Var.
Current Out. 1 Var. (C4.1.1) is set to "LEVEL", make sure the output current Current Out. 1 Var. Current Out. 1 Var.
Current Out. 1 Var. (C4.1.1) is set to "DISTANCE", make sure Current Out. 1 Var. Current Out. 1 Var.
Device
OPTIWAVE x400 series
OPTIWAVE x500 series
www.krohne.com
OPTIWAVE X400 / X500
Current Out. 1 Var. (C4.1.1) is set to
Current Out. 1 Var. Current Out. 1 Var.
Version
non-Ex / Ex i
Ex d
non-Ex / Ex i
Ex d
10/2020 - 4008265401 - AD SIL OPTIWAVE x4-x500 R01a en
Proof Test
Coverage (PTC)
76%
77%
81%
82%