Noise Prevention; Storage Location; Maintenance - Nagano Keiki CE40 Instruction Manual

6. Noise prevention

Noise issues are complicated and many of them cannot be solved easily. If measured values
often fluctuate or differ, they may be affected by noise. In this case, take noise prevention
measures described below.
 Conduction noise
If noise remains in the power line, it may cause malfunctions such as fluctuation of pressure
measurement value. Take care not to tangle the AC・DC power line. Also use a power supply
which is of high noise rejection rate or stable enough for keeping ripple voltage from
remaining.
 Output routing
In open collector output circuit, since output line and internal circuit are connected directly,
pay attention not to tangle lines. Also, make connection cables as short as possible.
 Radiation noise
Radiation noise from outside sources may cause malfunctions. In this case, separate the
instrument from the noise source, change direction, and use a magnetic shield or an
electrostatic shield.
 Lightning surge
Lightning surge may cause malfunctions. Please connect this unit to indoor distribution
network which is free from influence of lightning surge.

7. Storage location

Do not store this device in the following places as it may cause malfunction
and damage.
 Any place where water can be reach.
 Any place where there can be negative influence of atmosphere,
！
Caution
temperature, humidity, sunlight, dust, salt or sulphuric air.
 Any places where there is vibration or shock (including during
transportation).
 Any place where chemicals are stored or where there are releases of gas.
 In direct sunlight or inside a hot vehicle etc...

8. Maintenance

In this unit, there are no moving parts in the sensing element and circuit components so
basically there will be no maladjustment. However, depending on the use condition, aging may
occur so biannual regular check is recommended.
Please refer to the following checklist at routine inspection.
 Checklist
・Appearance check (Blemish, Spring, Distortion, Corrosion and so on.)
・Spring, Distortion, Corrosion, Stain, Leak and so on of flush diaphragm (CE40-MW8 only).
・Insulation resistance between an input-output terminal batch and a case
(100MΩ or more at 50VDC).
・Operation check by the pressure reference device and indicator.
(Checking of the pressure characteristic and zero adjustment can be possible with ER40 IR
COMMUNICATOR (Sold separately))
TY-CE40-004A 12/14
Rev.3