NOSHOK 1900 C.1, C.2, C.3, C.4 process indicator Technical manual
Below you will find brief information for process indicator 1900 1900C.1, process indicator 1900 1900C.2, process indicator 1900 1900C.3, process indicator 1900 1900C.4. The document gives you information on installing, operating and troubleshooting your new process indicators. It describes the unit's capabilities and specifications including its operating range, display options and environmental parameters.
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1900
S E R I E S
T E C H N I C A L M A N U A L
CURRENT LOOP POWERED PROCESS INDICATORS
1010 WEST BAGLEY ROAD
BEREA, OHIO 44017
PHONE 440/243-0888
FAX 440/243-3472
E-MAIL: [email protected]
WEBSITE: www.noshok.com
MODELS 1900C.1/1900C.2/1900C.3/1900C.4 - CURRENT LOOP POWERED PROCESS INDICATORS
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DUAL RANGE, 4 to 20 mA OR 10 to 50 mA
3½-DIGIT, 0.6" (15.2 mm) HIGH DIGITS
POSITIVE IMAGE TRANSFLECTIVE LCD WITH RED BACKLIGHT
OR POSITIVE IMAGE REFLECTIVE LCD (1900C.1/1900C.2)
POSITIVE IMAGE TRANSFLECTIVE LCD WITH RED BACKLIGHT
OR NEGATIVE IMAGE TRANSMISSIVE WITH RED OR
YELLOW/GREEN BACKLIGHT (1900C.3/1900C.4)
SPAN AND OFFSET CAPABILITY
NEGATIVE AND OVERRANGE INDICATION
SELECTABLE DECIMAL POINT POSITION
NEMA 4X/IP65 SEALED FRONT PANEL BEZEL
FITS DIN STANDARD CUT-OUT 2.68" (68 mm) X 1.30" (33 mm)
FOR USE IN HAZARDOUS LOCATIONS:
Class I, Division 2, Groups A, B, C, and D
Class II, Division 2, Groups F and G
Class III, Division 2
DESCRIPTION
The 1900C.1/1900C.2 and 1900C.3/1900C.4 are additions to the NOSHOK
1900 Series product line. The 1900C.1/1900C.2 uses a 4 to 20 mA or a
10 to 50 mA input signal as operating power. The input signal is also used to power the backlighting on the 1900C.2 Unit. The 1900C.3/1900C.4 uses a 4 to 20 mA or a 10 to 50 mA input signal to power the unit. An external power supply is used to power the 1900C.3/1900C.4 backlighting to provide a brighter, more consistent display and a lower compliance voltage.
The units have a 3½-digit LCD display with 0.6" (15.2 mm) high digits and a DIP switch selectable decimal point. The 1900C.1/1900C.2 display is available in positive image reflective (dark digits, reflective background) or positive image transflective (dark digits, illuminated background) with red backlighting. The 1900C.3/1900C.4 display is available in positive image transflective (dark digits, illuminated background) with red or yellow/green backlighting or negative image transmissive (illuminated digits, dark background) with red or yellow/green backlighting.
The ability to scale the display allows indication in any desired unit of measurement such as temperature, pressure, humidity, fluid flow, etc. The unit is calibrated at the factory with 0.0 displayed @ 4 mA input and 100.0 displayed
@ 20 mA input.
The units are contained in a lightweight, high impact plastic case with a clear viewing window. When properly installed, the sealed front panel meets NEMA
4X/IP65 specifications for wash-down and dusty environments.
CAUTION: Read complete instructions prior to installation and operation of the unit.
DIMENSIONS “In inches (mm)”
SAFETY SUMMARY
All safety related regulations, local codes and instructions that appear in the manual or on equipment must be observed to ensure personal safety and to prevent damage to either the instrument or equipment connected to it. If equipment is used in a manner not specified by the manufacturer, the protection provided by the equipment may be impaired.
WARNING - EXPLOSION HAZARD - SUBSTITUTION
OF COMPONENTS MAY IMPAIR SUITABILITY FOR
CLASS I, DIVISION 2 / CLASS II, DIVISION 2 / CLASS III, DIVISION 2
SPECIFICATIONS
1. DISPLAY: 3½-digit (-1999 to 1999), 0.6" (15.2 mm) high digits.
The 1900C.1/1900C.2 is available with a positive image reflective LCD or a red backlit positive image transflective LCD. The intensity of the backlighting will vary with the input signal.
The 1900C.3/1900C.4 is available with a positive image transflective LCD with red or yellow/green backlighting or a negative image transmissive with red or yellow/green backlight.
A minus sign is displayed when the indicator is adjusted for a negative offset.
Overrange: Overrange is indicated by a “1” in the most significant digit and the blanking of the three least significant digits.
2. EXTERNAL BACKLIGHT POWER: (1900C.3/1900C.4 only)
9 - 28 V dc, @35 mA typ., 50 mA max. Power Supplies must be Class 2
(NEC) or SELV rated. Above 26 V dc, derate the operating temperature to
50°C.
3. DECIMAL POINTS: Three DIP switch selectable, decimal point positions allow the display to be read in tenths, hundredths or thousandths.
Note: Recommended minimum clearance (behind the panel) for mounting clip installation is 2.15" (54.6) H x 3.00" (76.2) W.
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SPECIFICATIONS (Cont’d)
4. MAXIMUM VOLTAGE DROP:
3.2 V dc for 1900C.1
4.0 V dc for 1900C.2
3.2 V dc for 1900C.3 & 1900C.4
5. EQUIVALENT RESISTANCE:
1900C.1
: 800 max. @ 4 mA; 160 max. @ 20 mA
320 max. @ 10 mA; 65 max. @ 50 mA
1900C.2
: 1000 max. @ 4 mA; 200 max. @ 20 mA
400 max. @ 10 mA; 80 max. @ 50 mA
1900C.3 & 1900C.4
: 800 max. @ 4 mA; 160 max. @ 20 mA
320 max. @ 10 mA; 65 max. @ 50 mA
6. MAXIMUM ALLOWABLE INPUT CURRENT: 100 mA
7. SCALING RANGE:
Span: Two potentiometers provide a coarse and fine span adjustment. Span range = 0 to 2000.
Offset: Two potentiometers provide a coarse and fine zero offset adjustment.
Offset range = -1999 to 1999.
8. LINEARITY: (@ 23°C, Less than 85% RH) ±(0.1% + 1 digit).
9. READING RATE: 2.5 per second, nominal.
10. RESPONSE TIME: 1.5 seconds to settle for a step change.
11. NORMAL MODE REJECTION: 60 dB 50/60 Hz
12. TEMPERATURE EFFECTS:
Span Temperature Coefficient: 100 PPM/°C
Offset Temperature Coefficient: 0.2 digits/°C
13. CONSTRUCTION: High impact plastic case with clear viewing window.
(Panel gasket and mounting clips included.) This unit is rated for NEMA
4X/IP65 indoor use. Installation Category I, Pollution Degree 2
14. CERTIFICATIONS AND COMPLIANCES:
ELECTRICAL SAFETY
EN 61010-1, IEC 1010-1
Safety Requirements for electrical equipment for measurement, control, and laboratory use, Part I.
INSTALLATION
When properly installed, the 1900C unit meets NEMA 4X/IP65 requirements for indoor use. The units are intended to be mounted into an enclosed panel. A sponge rubber gasket, mounting clip, two screws, and nut fasteners are provided to install and seal the unit in the panel cutout.
Installation Environment
The unit should be installed in a location that does not exceed the maximum operating temperature and provides good air circulation.
Placing the unit near devices that generate excessive heat should be avoided.
The bezel should be cleaned only with a soft cloth and neutral soap product. Do NOT use solvents.
Continuous exposure to direct sunlight may accelerate the aging process of the bezel.
The following procedure assures proper installation:
1. Cut the panel opening to the specified dimensions.
Remove burrs and clean the panel opening.
2. Slide nut fastener into slot on mounting clip and then insert mounting screw through nut on both sides of mounting clip. The tip of mounting screw should not project through hole on clip.
3. Slide the panel gasket over the rear of the unit to the back of the bezel. Install 1900C unit through panel cutout.
4. Slide mounting clip over rear of unit until the clip is against back of panel. The mounting clip and 1900C housing have a latching feature to hold the unit in place until tightened.
Note: Hold the 1900C front bezel in place when sliding the mounting clip into position.
5. Alternately tighten each mounting screw to ensure uniform gasket pressure.
Visually inspect the gasket for proper seal. The gasket should be compressed to approximately 75 to 80% of its original thickness.
(Recommended torque is 28 to 36 in-oz.)
6. If the gasket is not adequately compressed and the mounting screws cannot be tightened any further, loosen the mounting screws and insure that the clip is latched as closely as possible to the panel.
7. Repeat Step #6 for tightening the mounting screws.
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ELECTROMAGNETIC COMPATIBILITY
Immunity to EN 50082-2
Electrostatic discharge EN 61000-4-2
Electromagnetic RF fields
Fast transients (burst)
RF conducted interference
Power frequency magnetic fields
EN 61000-4-3
EN 61000-4-4
EN 61000-4-6
EN 61000-4-8
Level 2; 4 Kv contact
Level 3; 8 Kv air
1 Level 3; 10 V/m
80 MHz - 1 GHz
Level 4; 2 Kv I/O
Level 3; 2 Kv power
Level 3; 10 V/rms 2
150 KHz - 80 MHz
Level 4; 30 A/m
Emissions to EN 50081-1
RF interference EN 55011 Enclosure class B
Power mains class B
Notes:
1. Self-recoverable loss of performance during EMI disturbance at 10 V/m:
Process Signal may deviate during EMI disturbance.
For operation without loss of performance:
Unit is mounted in a metal enclosure (Buckeye SM7013-0 or equivalent) connected to earth ground.
2. Self-recoverable loss of performance during EMI disturbance at 10 Vrms.
Process signal may deviate during EMI disturbance.
For operation without loss of performance:
Install 1 ferrite core, RLC #FCOR0000 or equivalent, to signal cable at the unit.
Refer to the EMC Installation Guidelines of this bulletin for additional information.
15. ENVIRONMENTAL CONDITIONS:
Operating Temperature: 0° to 60°C
(Derate backlight voltage to 26 V dc above 50 °C.)
Storage Temperature: -40° to 80°C
Operating and Storage Humidity: 85% max. (non-condensing) from 0°C to 60°C.
Altitude: Up to 2000 meters
16. WEIGHT: 3.3 oz. (93.5 g)
EMC INSTALLATION GUIDELINES
Although this unit is designed with a high degree of immunity to
ElectroMagnetic Interference (EMI), proper installation and wiring methods must be followed to ensure compatibility in each application. The type of the electrical noise, source or coupling method into the unit may be different for various installations. Cable length, routing and shield termination are very important and can mean the difference between a successful installation or a troublesome installation. Listed below are some EMC guidelines for successful installation in an industrial environment.
1. Use shielded (screened) cables for all Signal and Control inputs. The shield
(screen) pigtail connection should be made as short as possible. The connection point for the shield depends somewhat upon the application.
Listed below are the recommended methods of connecting the shield, in order of their effectiveness.
a. Connect the shield only at the panel where the unit is mounted to earth ground (protective earth).
b. Connect the shield to earth ground at both ends of the cable, usually when the noise source frequency is above 1 MHz.
c. Connect the shield to common of the unit and leave the other end of the shield unconnected and insulated from earth ground.
2. Never run Signal or Control cables in the same conduit or raceway with AC power lines, conductors feeding motors, solenoids, SCR controls, and heaters, etc. The cables should be run in metal conduit that is properly grounded. This is especially useful in applications where cable runs are long and portable two-way radios are used in close proximity or if the installation is near a commercial radio transmitter.
3. Signal or control cables within an enclosure should be routed as far away as possible from contactors, control relays, transformers, and other noisy components.
4. In extremely high EMI environments, the use of external EMI suppression devices, such as ferrite suppression cores, is effective. Install them on Signal and Control cables as close to the unit as possible. Loop the cable through the core several times or use multiple cores on each cable for additional protection. Install line filters on the power input cable to the unit to suppress power line interference. Install them near the power entry point of the enclosure. The following EMI suppression devices (or equivalent) are recommended:
Ferrite Suppression Cores for signal and control cables:
Fair-Rite # 0443167251 (RLC #FCOR0000)
TDK # ZCAT3035-1330A
Steward #28B2029-0A0
Line Filters for input power cables:
Schaffner # FN610-1/07 (RLC #LFIL0000)
Schaffner # FN670-1.8/07
Corcom #1VR3
Note: Reference manufacturer’s instructions when installing a line filter.
5. Long cable runs are more susceptible to EMI pickup than short cable runs.
Therefore, keep cable runs as short as possible.
WIRING CONNECTIONS
All conductors should meet voltage and current ratings for each terminal. Also cabling should conform to appropriate standards of good installation, local codes and regulations. It is recommended that power supplied to the unit (ac or dc) be protected by a fuse or circuit breaker.
The electrical connections are made via screw-clamp terminals located on the back of the unit. When wiring the unit, use the label to identify the wire position with the proper function. Strip the wire, leaving approximately ¼" of bare wire
(stranded wires should be tinned with solder). Insert the wire into the screw-clamp terminal and tighten the screw until the wire is clamped tightly. Each terminal can accept up to two #14
AWG wires.
1900C
1900C SIGNAL INPUT
The current range is selected by setting DIP switch S1 to the OFF position for a 4 to 20 mA input or ON for a 10 to 50 mA input. Attach the signal wires to terminals 3 (SIG-) and 4 (SIG+) observing the correct polarity. The (SIG-) signal input circuit is not reverse polarity protected.
Backlight Power (1900C.3/1900C.4 only)
Attach a 9 to 28 V dc supply to terminals 1 (COM) and 2 (V+) to power the backlight. Terminals 3 (SIG-) and 1 (COM) are ac coupled with a capacitor.
This limits the isolation between these terminals to 50 V dc maximum.
OFFSET ADJUSTMENTS
The minimum currents are not zero based with 4 to 20 mA and 10 to 50 mA signals. To obtain a zero minimum display reading, the display must be offset.
The display on the 1900C can be offset by adjusting the Coarse and Fine Offset
pots.
SPAN ADJUSTMENTS
Span is defined as the numerical range that the display traverses, disregarding the decimal point, when the input signal is varied from minimum to maximum
(4 to 20 mA or 10 to 50 mA). For example; if a unit is to display 250 @ 4 mA and 1000 @ 20 mA, the span is 750 (the difference between 250 and 1000). Had the minimum display been -250, the span would be 1250 (1000 - (-250) = 1250).
The 1900C unit can be set to operate over a wide span range by adjusting the
Coarse and Fine Span adjustment pots. The Coarse Span pot is used to get the display to within a couple of counts of the desired reading, and the Fine Span pot is used to adjust for the exact reading.
WARNING - EXPLOSION HAZARD - DO NOT DISCONNECT
EQUIPMENT UNLESS POWER HAS BEEN SWITCHED OFF
OR THE AREA IS KNOWN TO BE NON-HAZARDOUS.
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DECIMAL POINT POSITION SELECTION
The decimal point position is DIP switch selectable for one of three locations.
The 1900C unit can be set up to read in 10ths, 100ths, or 1000ths. If all the
DIP switches are set to the “OFF” position, no decimal point will appear on the display. The DIP switches are located at the rear of the unit.
APPLICATION EXAMPLE
Operation of a refinery process required a local display of the position of a remote pipeline valve. The display would indicate 0 (zero) when the valve was fully closed with an input signal of 4 mA. When the valve was fully open the display would indicate 100 with an input signal of 20 mA.
CALIBRATING THE DISPLAY
Calibrating the 1900C unit requires either an accurate adjustable constant current supply or the 1900C unit can be installed and scaled with the process sensor connected to the 1900C unit. T o calibrate the unit, proceed as follows.
1. Set DIP switching for the desired current range.
2. Select the desired decimal point position.
3. Apply the minimum input signal to the 1900C unit and adjust the
COARSE OFFSET to display the approximate desired minimum value.
4. Apply the maximum input signal to the 1900C unit and adjust the
COARSE SPAN to display the approximate desired maximum value.
5. Repeat steps 3 and 4 until the minimum and maximum values are within the
desired values.
6. Apply the minimum input signal to the 1900C unit and adjust the FINE
OFFSET to display the exact desired minimum value.
7. Apply the maximum input signal to the 1900C unit and adjust the FINE
SPAN to display the exact desired maximum value.
8. Apply the minimum input signal and verify that the display indicates
correctly.
9. Apply the maximum input signal and verify that the display indicates
correctly.
10. Repeat Steps 6 through 9 until display reads exact.
Note: The 1900C Unit display is factory calibrated to indicate 0.0 to 100.0
with an input of 4 to 20 mA at approximately 25°C.
1900C.2
BLOCK DIAGRAM
TROUBLESHOOTING
For further technical assistance, please contact us.

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Key features
- Current loop powered
- Dual range: 4-20 mA or 10-50 mA
- 3 1/2 digit display
- High impact plastic case
- NEMA 4x/IP65 sealed front panel
- Span and offset capability
- Selectable decimal point
- Available with red or yellow/green backlight