NITRA PNEUMATICS NCP1 Series Manual

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NCP1 Series
Electropneumatic Transducer (I/P)
Installation, Operation and
Maintenance Instructions
AutomationDirect
3505 Hutchinson Road
Cumming, GA 30040
1-800-633-0405
Nitra NCP1
Series
Contents
Section Description Page
1.0 Description & Installation 2
2.0 Operation 3
3.0 Approvals 5
4.0 Maintenance 5
5.0 Troubleshooting 6
6.0 Warranty 6
NCP1 Series I/P Transducers
Part Number Input
Output Range
psig bar
NCP1-20-315N 4-20 mA 3-15 0.2-1.0
NCP1-20-327N 4-20 mA 3-27 0.2-1.9
NCP1-20-630N 4-20 mA 6-30 0.4-2.0
NCP1-20-260N 4-20 mA 2-60* 0.14-4.0
NCP1-20-3120N 4-20 mA 3-120* 0.2-8.0
* Output shown is as calibrated at the factory. Large span adjustment capability allows
recalibration to achieve output ranges from 3-35 psig (0.2-2.4 bar) with
2-60 psig unit to 3-145 psig (0.2-10 bar) with 3-120 psig unit.
Ordering Information

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NCP1 Series
DANGER, WARNING, CAUTION and NOTE statements
DANGER Refers to conditions or hazards which could result in serious personal injury or death.
WARNINGRefers to conditions or hazards which could result in personal injury.
CAUTION Refers to conditions or hazards which could result in equipment or property damage.
NOTE Alerts you to facts or special instructions.
ALL DANGER, WARNING, AND CAUTION NOTICES MUST BE COMPLIED WITH IN FULL
SPECIFICATIONS
* Can be recalibrated to provide 3-9 psig or 9-15 psig for split ranging applications.
** To obtain the most current agency approval information, see the Agency Approval Checklist section on the specific part number’s web page.
Part No. NCP1-20-315N NCP1-20-327N NCP1-20-630N NCP1-20-260N NCP1-20-2130N
Functional Specifications
Input 4-20 mA
Outputs (psig - BAR) 3-15* (0.2-1.0) 3-27 (0.2-1.8) 6-30 (0.4-2.0) 2-60 (0.14-4.0) 3-120 (0.2-8.0)
Supply Pressure (psig - bar) 18 min -100 max
(1.2 min - 6.7 max)
30 min - 100 max
(2.0 min - 6.7 max)
33 min - 100 max
(2.2 min - 6.7 max)
65 min - 150 max
(4.3 min - 10.0 max)
125 min - 150 max
(8.3 min - 10.0 max)
Air Consumption 0.05 scfm (1.4 Nl/min) midrange typical 0.07 scfm (2 Nl/min) midrange typical
Flow Capacity 4.5 scfm (127 Nl/min) at 25 psig (1.7 BAR) supply
12.0 scfm (340 Nl/min) at 100 psig (6.8 BAR) supply
20.0 scfm (566 Nl/min) at
150 psig (10.5 BAR) supply
Exhaust Capacity 2 scfm (56.6 Nl/min) at 5 psig (2.4 BAR) above 20 psig (1.3 BAR) setpoint 7 scfm (198 Nl/min) at 10 psig (0.7 BAR) above 20 psig (1.3
BAR) setpoint
Temperature Limits -20°F to +140°F (-30°C to +60°C)
Impedance 180 Ohms 220 Ohms 220 Ohms 225 Ohms 260 Ohms
Performance Specifications
Linearity <± 0.75% of span <± 1.5% of span typical, ± 2.0% max.
Hysteresis and Repeatability < 1.0% of span; < 0.5% of span < 0.5% of span; < 0.5% of span
Supply Pressure Sensitivity <± 0.1% of span per psig (<± 0.15% of span per 0.1 BAR) <± 0.04% of span per 1.0 psig (0.07 BAR)
Physical Specifications
Pneumatic Port Sizes 1/4” NPT female
Media Oil free, clean dry air filtered to 40 micron
Electrical Connections Conduit 1/2” NPT female with 12” wire leads
Mounting Direct or bracket (bracket included)
Housing Chromate-treated aluminum with epoxy paint. NEMA 4X (IP65)
Elastomers Buna-N
Trim Stainless steel; brass; zinc-plated steel
Weight 2.1 lbs. (0.94 kg)
Approvals FM (Haz-Loc)**
1. DESCRIPTION and INSTALLATION
1.1 Description
1.1.1 The NITRA NCP1 Series converts a current input signal to a linearly proportional pneumatic output pressure. This
versatile instrument is designed for control applications that require a high degree of reliability and repeatability at an
economical cost.

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NCP1 Series
1.2 Principle of Operation
1.2.1 The NITRA NCP1 Series is a force balance device in which a coil is suspended in the field of a magnet by a flexure.
Current flowing through the coil generates axial movement of the coil and flexure. The flexure moves towards the
nozzle and creates back pressure which acts as a pilot pressure to an integral booster relay. Input signal increases cause
proportional output pressure increases.
Zero and Span are calibrated by turning adjust screws on the front face of the unit. Adjustment of the zero screw
repositions the nozzle relative to the flexure. The span adjustment is a potentiometer that controls the amount of current
through the coil.
1.3 Mounting
1.3.1 Unit may be pipe, panel, or bracket mounted. Mounting may be at any angle, though may require field adjustment. High
external vibration may cause output fluctuations. Mounting in a vibration-free area is recommended.
1.4 Pneumatic Connections
1.4.1 The 1/4” NPT supply and output ports are marked “IN” and “OUT” respectively on the base of the unit. Clean all pipe
lines to remove contamination before installation. If thread sealer is required, use a tape type that is compatible with the
media. Liquid or paste type thread sealer is not recommended.
Clean dry instrument quality air must be used. To insure optimum performance supply pressure should be regulated. To
provide stable inlet pressure and prevent contamination of the internal section of the transducer the use of an Instrument
Air Filter Regulator is recommended.
The two unmarked ports on the base of the unit are gauge ports but may be used as alternative output ports. Any unused
ports must be plugged.
WARNINGThe I/P transducer enclosure contains aluminum and is considered to constitute a potential risk of ignition by
impact or friction and must be taken into account during installation.
1.5 Electrical Connections
1.5.1 Electrical connections are made to the black and white leads extending out from the 1/2” NPT conduit fitting.
Black = Positive
White = Negative
4-20 mA
2. OPERATION
2.1 Calibration
2.1.1 Zero and Span should always be checked after mounting. If unit is calibrated in a vertical position and then mounted at an
angle, readjustment of the zero is necessary. To calibrate use the following procedure:
1. Open protective covers to expose zero and span adjustment screws.
2. Connect the recommended air supply to the inlet of the transducer and an accurate pressure gauge to the outlet.
3. Connect the electrical input and set the input signal to 4mA.
4. Observe the output pressure. If necessary, adjust the zero screw until reaching minimum output pressure setting.
Turn zero screw counter clockwise to increase pressure, clockwise to decrease pressure.
NOTE If unable to achieve output during calibration process, follow the steps outlined in 4.1.4 to clean the orifice.
Then turn zero adjustment screw counter clockwise for up to 30 revolutions, until output pressure rises.

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NCP1 Series
5. Increase electrical input signal to 20mA.
6. Observe the output pressure. If necessary adjust the span screw until reaching maximum output pressure setting.
NOTE For I/P (current) input models turn span screw counter clockwise to increase pressure, clockwise to decrease
pressure.
7. The Zero and Span adjustments are interactive. After adjusting the span it will be necessary to recheck the zero.
Repeat steps 3-6 until both end points are at the required values.
2.2 Dimensional Drawings (Dimensions are inches [mm])

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NCP1 Series
3. APPROVALS
3.1 Intrinsically Safe Operation
4. MAINTENANCE
NOTE Under normal circumstances, no maintenance should be required.
4.1 Instrument Air Filtration
4.1.1 Failures due to instrument supply air contamination are not covered by warranty.
4.1.2 Use of oil and/or water saturated instrument air can cause erratic operation.
4.1.3 Poor quality instrument air can result in unit failure. It is recommended that a filter regulator be placed upstream of each
unit where oil and/or water laded instrument air is suspected.
4.1.4 If clean, dry air is not used the orifice can become blocked. To clean, first turn off supply air, unscrew and remove orifice
assembly (large silver screw head located above the out port). Then unplug orifice by using a wire that has a smaller
diamter than 0.015 in. (0.38 mm). Use compressed air to blow out any loose particles inside the orifice assembly. Screw
orifice assembly back into unit.

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NCP1 Series
5. TROUBLESHOOTING
Pilot Pressure
Atmospheric Pressure
Supply Pressure
Output Pressure
Lead Wire
Bonnet
O-Ring
O-Ring
Body Subassembly
Circuit Board
Bottom Plug
Spacer
Pintle Spring
Problem Look For Solution
No output or low
output
Zero adjustment
Supply pressure too low
Reset zero (2.1)
Increase supply pressure (see specs)
Unstable / low output Electrical connection
Clogged orifice
Check connection/signal (1.5.1)
Clean orifice (3.1.3)
Erratic operation Liquid/contamination in air
supply Clean air supply (1.4.4)
Works in reverse Pressure goes down when
signal is increased Reverse input wires (1.5.1)
Output equals supply
pressure Improper pneumatic
connections
Insure that supply is connected to “IN”
port and
output is connected to “OUT” port
(1.4.1)
NOTE If problems are not solved by troubleshooting procedures, contact AutomationDirect.com technical support
for further assistance at 770-844-4200.
6. WARRANTY & DISCLAIMER
See AutomationDirect.com for latest Terms & Conditions
WARNINGThese products are intended for use in industrial compressed-air systems only. Do not use these products where
pressures and temperatures can exceed those listed under Specifications. Not for oxygen service.