Ashcroft ZT11 Installation And Maintenance Instructions Manual - Page 6

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Installation and Maintenance Instructions

for ZT11 High Purity Transmitter

Be sure to recalibrate the device using a set method or reca-

libration standards. Take special care not to effect the explo-

sion-proof performance of the instrument when inspecting in a

hazardous area.

The following is a routine inspection checklist

for your reference and use

Routine Inspection Checklist

• Physical Appearance (scratches, cracks, warping,

corrosion, etc.)

• Corrosion status of pressure inlet

• Clogging of the air inlet

• Leak test for the connection points and re-tightening of con-

necting screw

•

Check and tighten all instrument screws

•

Insulation resistance between each terminal and case

(at 100MΩor more/50V DC or less)

• Output check by a pressure reference device and measuring

instrument

• Avoid electrostatic discharge.

• Use a soft cloth moistened with water to

only clean the external parts of the instru-

CAUTION:

ment. Do not use thinner, benzene, etc.

which cause deterioration and failure.

9.2 Adjustment

Remove the rubber plug (with simple anti-falling function)

mounted to top of the enclosure.

• The rubber plug is equipped with simple

anti-falling function, however if it is pulled

strongly, the function is impaired. Please be

CAUTION:

careful not to pull too much more than nec-

essary [<17 in. lb.].

The "Z" on the rubber plug indicates the position of the

potentiometer for Zero adjustment, and the "S" indicates

the position of the potentiometer for Span adjustment.

• Do not attempt adjustments if product is

wet. Do not allow water to enter the product

as this can lead to damage and/or

accidents.

• Make adjustments once the product has

been powered and allowed to warm up for

CAUTION:

15 minutes (recommended 30 minutes).

All sales subject to standard terms and conditions of sale. ZT11_Transducer_im_RevA_(I&M011-10274)_04-03-20

• Zero and span adjustment are performed

by rotating zero/span potentiometer with

resin or ceramic Phillips screwdriver. Be

careful not to mistake the position and ori-

CAUTION:

entation of each adjustment.

• Avoid placing an excessive load [within 5N,

10 sec.] on the zero/span adjustment poten-

tiometer as this can lead to damage.

• Be extremely careful not to cause a short

circuit with the screwdriver.

• Use properly calibrated and traceable

instrumentation to verify adjustments.

(1) Zero adjustment

Zero adjustment is performed by rotating zero/span adjustment

potentiometer shown in the figure (Page 9) with Phillips screw-

driver.

Note: Refer to the following directions as the adjustment meth-

od for positive and compound ranged products differ.

[Positive pressure range]

Be sure that the applied pressure to the sensor has been

returned to atmospheric pressure (no pressure) state; adjust

the sensor output at this time to 4mA DC.

[Compound range]

Be sure that the applied pressure to the sensor has been

released to atmospheric pressure (no pressure) state; adjust

the sensor output at this time to the value calculated by the

following:

• Output 4 to 20mA DC (current output)

[Output mA DC in atmospheric pressure state] = [16mA DC]

/ ([Upper limit output in range (MPa)] - [-0.1 MPa]) x 0.1 +

[4mA DC]

e.g.) <0.5MPa, Compound range: 6.67mA DC> /

<1.0MPa, Compound range: 5.45mA DC>

• Do not rotate span adjustment potentiometer

CAUTION:

during zero adjustment.

• Avoid putting an excessive load, >44 in. lb.,

10 sec., on the zero/span adjustment poten-

tiometers as this may result in damage.

(2) Span adjustment

When attempting span adjustment with a pressure reference

device, please follow the instructions listed below.

Zero/span adjustment is performed by rotating zero/span

adjustment potentiometer with a slotted screwdriver as shown

in the following figure.