21
Y-KH15-007A Rev.3
12.2.1 Zero adjustment
Turn the zero trimmer with a slotted screwdriver to perform zeroing. A positive pressure range
and compound range are adjusted differently as shown below.
< Positive pressure range >
Adjust output in a vented (unpressurized) state to 4 mA DC for the current output product, and to
1V DC or 0V DC for the voltage output product.
< Compound range >
Calculate the output value in the vented state based on the formula below.
Current output product (4 to 20 mA DC)
(output in a vented state (mA)) = (16 mA / ([upper limit pressure range (MPa)] - [ -0.1 MPa])) x 0.1
+ 4 mA
< Example > 0.5 MPa compound range: 6.67 mA, 1.0 MPa compound range: 5.45 mA
Voltage output product (1 to 5V DC)
(output in a vented state (V)) = (4V / ([upper limit pressure range (MPa)] - [-0.1 MPa])) x 0.1 + 1V
< Example > 0.5 MPa compound range: 1.667 V, 1.0 MPa compound range: 1.364 V
Voltage output product (0 to 5V DC)
(output in a vented state (V)) = (5V / ([upper limit pressure range (MPa)] - [ -0.1 MPa])) x 0.1 + 0V
< Example > 0.5 MPa compound range: 0.833 V, 1.0 MPa compound range: 0.454 V
Ensure that the pressure is released to the atmosphere (no pressure) and adjust the output under
this condition to the above calculated value.
Be careful not to turn the span trimmer "S" during zeroing.
12.2.2
Span adjustment
Ask us for span adjustment unless there are exceptional circumstances. Do not perform span
adjustment if you do not have a reference pressure gauge.
To perform span adjustment using the reference pressure gauge, follow the procedures below.
Please also note that the output value of a reverse output is different from that of the compound
pressure gauge.
1) Perform zeroing as described in “12.2.1 Zero adjustment”.
2) Apply an upper limit pressure range correctly, and use the span trimmer to adjust the output
to 20 mA DC for the current output product and to 5V DC (or the span value) for the voltage
output product.
3) Repeat steps 1) and 2) alternately to adjust the zero point and span.
CAUTION
