Installation guide

4.0 CALIBRATION

The 230 transducer is factory calibrated and should require no eld adjustment. Whenever possible,

any zero and/or span osets should be corrected by software adjustment in the user’s control system.

However, zero and span adjustments are made by removing the cover on the top of the 230 and the

6-32 seal screws in the plastic terminal block. Be sure to reinstall seal screws after zero and/or span

adjustments. Current output transducers (4-20 mA) are factory calibrated using a 250 ohm load at 24

VDC. Zero and span adjustments are approximately 300 mV (for voltage units) and ±1.0 mA (for current

units), individually.

The 230 Series is calibrated with the diaphragm in the vertical position (pressure ports horizontal). For

use in other orientations, position the unit and adjust the zero by following the calibration procedure in

the previous section.

Optimal results will be achieved by using the factory calibrated position. The 230 position eects is as

follows (pressure ports in vertical plane): ±.5D, ±1D, 1D, 2D ranges. ±1% per g for all other standard

ranges. There is a negative output shift with the high pressure port facing up and a positive shift in the

output with the high pressure port facing down.

4.1 Voltage Output Zero Adjustment

While monitoring the voltage between the positive output (OUT) and common, and with both pressure

ports open to atmosphere, the zero may be adjusted. For unidirectional pressure ranges, turn the zero

adjustment screw until a reading of 0.05 VDC (±25 mV for 0-5 VDC or ±50 mV for 0-10 VDC output) is

achieved. For bidirectional pressure ranges, set zero to 2.550 VDC (±25 mv) for 0-5 VDC output or 5.050

VDC (±50 mV) for 0-10 VDC output.

4.2 Voltage Output Span Adjustment

Complete the zero adjustment before setting span.)

Span or full scale output adjustments should only be performed by using an accurate pressure standard

(electronic manometer, digital pressure gage, etc.), with at least comparable accuracy to the 230 series

(±0.25% full scale). With the full range pressure applied to the high pressure port (reference open to

atmosphere), adjust output to 5.050 (±25 mV) or 10.050 VDC (±50 mV)

Example 1: Unidirectional pressure range of 0 to 1 PSI

Apply 1 PSI, adjust output to 5.050 VDC (or 10.050 VDC)

Example 2: Bidirectional pressure range of ±.5 PSI

Apply .5 PSI, adjust output to 5.050 VDC (for 10.050 VDC)