Product Bulletin DL3 Transmitter

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DL3 Digital Level Transmitter

DL3 Transmitter Description The DL3 digital level transmitter, shown in figure 1, is designed to sense the level of a liquid, the level of an interface between two liquids, or the density of a liquid in a vessel, and produce a standard 4-20 mA analog output signal proportional to the process variable. The DL3 is HART® compliant.
The transmitter comes complete with a wafer-style sensor which can be flange-mounted to the top of a vessel or installed in a customer-supplied cage or chamber, as shown in figure 5.
Unless otherwise noted, all NACE references are to NACE MR0175-2002.

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Features

Installation Versatility— With the integration of a wafer-style liquid level sensor and transmitter into one product, the DL3 enables users to install digital level transmitters to a variety of industry standard or custom process vessel connections. Installing the DL3 in a customer-supplied external cage gives process equipment designers freedom to select the best process vessel connection location and configuration to meet specific application requirements.
HART / AMS Compliant— The DL3 uses the HART protocol to interface to the 275 HART Communicator, or 375 Field Communicator for field operations interface. Advanced user-interface capabilities are enabled by AMS® Suite: Intelligent Device Manager (see figure 3), including database management, remote calibration, comprehensive views of configuration, alarm, status, compensation tables, and troubleshooting parameters, as well as retaining access to the diagnostic procedures via pull-down menus.
Increased Accuracy— When a process temperature is input via HART protocol, the DL3 can automatically compensate for any specific gravity changes of the process fluid caused by temperature variability.
NACE Compliant— The materials used in the DL3 wafer-style sensor (see table 2) meet the metallurgical requirements of NACE MR0175 2002. Environmental limits may apply.
Corrosion Protection— Acrylic enamel-based paint and encapsulated electronics in the transmitter provide protection and reliability in hostile environments.
Ease of Calibration / Configuration— The DL3 comes factory-calibrated for SG = 1.00 and 21°C (70°F). The Setup Wizard enables a straight forward and fast reconfiguration to the user's application. Changing the SG of the liquid, switching to interface or density mode, or re-ranging the output can all be accomplished by simple data entry.
Modular Design—The stab-in design of the field terminal box allows the easy removal of the instrument for repair or maintenance, without disconnecting field wiring. The modular design of the transducer assembly and the encapsulated electronics board, the separate LCD assembly, and the terminal box, add ease to any maintenance required by the instrument. See figure 2. The terminal box and LCD assembly are passive so re-calibration is not required when they are replaced.

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Principle of Operation The sensor consists of a wafer body, torque tube assembly and displacer (see figure 4) and is rated for CL150, 300, and 600. The wafer body mounts between NPS 3 or 4 raised-face flanges.
The torque tube assembly consists of a hollow torque tube with a shaft welded inside it at one end and protruding from it at the other end.
The unconnected end of the tube is sealed by a gasket and clamped rigidly to the torque tube arm, permitting the protruding end of the shaft to twist and therefore transmit rotary motion. This allows the interior of the torque tube to remain at atmospheric pressure, thus eliminating packing and the disadvantages of packing friction. This is a proven and reliable seal.
A change in liquid level, interface level, or density/specific gravity buoys up the displacer by a force equal to the weight of the liquid displaced. Corresponding vertical movement of the displacer results in angular movement of the displacer rod around the knife-edge. Since the torque tube assembly is a torsional spring which supports the displacer and determines the amount of movement of the displacer rod for a given displacement change, it will twist a specific amount for each increment of buoyancy change.
The rotary motion of the torque tube is transferred to the transmitter lever assembly (see figure 2). The rotary motion moves a magnet attached to the lever assembly, changing the magnetic field that is sensed by the Hall-effect sensor. The sensor converts the magnetic field signal to a varying electronic signal, which is processed digitally to provide linearity corrections, sensitivity adjustment, and temperature compensation.
The signal is interpreted as a buoyancy change by reference to the stored torque rate, coupling point, and moment arm data. The buoyancy change in turn is interpreted as a level, interface, or density change by reference to stored displacer volume, specific gravity, and displacer length data. In level or interface modes, the correction for displacer motion is then added, as well as user-supplied offset to change the PV reference from the bottom of the displacer or correct for a coupling point error.
The resultant primary variable (PV) is then compared to PV alarm thresholds (if enabled) and used to set status bits and/or trigger the analog alarm current. If the alarm is not triggered, the PV is used to generate 4-20 mA analog and 0-100% range digital signals by reference to the stored upper and lower range values. The resultant analog command is limited at the saturation values to allow discrimination between saturated and alarm signals.

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Ordering Information When ordering, specify:
Wafer-Style Sensor Construction

Size—NPS 3 or 4 raised-face flange wafer-style sensor suitable for CL150 through 600 flange rating
Material— Steel or stainless steel

Notes
All DL3 digital level transmitters are factory calibrated for: SG = 1.00 and 21°C (70°F).

Right-hand mounting is standard, and can be field configured to left-hand mounting as required by installation.

During shipment, displacers are detached from the sensors.

Equalizing piping, stillwells, or other equipment may be required for installation. Emerson Process Management does not provide this equipment.

Instruction manuals used with the DL3 digital level transmitter are: FIELDVUE ® DLC3000 Digital Level Controllers (D102748X012) and 249W Cageless Wafer Style Level Sensor (D102803X012).

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Cage Construction

Note
A cage is not supplied with the DL3 . For a factory built cage-style construction, contact your Emerson Process Management sales office.

Figure 6 provides guidelines for fabricating a cage.
When fabricating a cage or chamber, maintain at least a minimum clearance of 10 mm (3/8-inch) between the diameter of the displacer and the inside diameter of the cage or displacer. Dirty or viscous fluids may require a larger clearance. Provide sufficient cage length below the displacer to ensure that the displacer does not hit the bottom of the cage. When installing the cage, it must be vertically plumb so that the displacer does not strike the side of the cage. See figure 7 for overall envelope dimensions for mounting a DL3.

Note
Neither Emerson, Emerson Process Management, nor any of their affiliated entities assumes responsibility for the selection, use, or maintenance of any product. Responsibility for the selection, use, and maintenance of any product remains with the purchaser and end-user.

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DL3 Specifications

Available Configurations

Transmitter: DLC3000 digital level controller
Wafer-Style Sensor: 249W
Matches NPS 3 or 4 raised-face flange, suitable for CL150 through 600 flange rating
Displacer length: 356 mm (14-inch)

Allowable Specific Gravity

Liquid Level: 0.4 to 1.2
Interface Level or Density: 0.08 minimum differential

Output Signal

Analog: 4-20 mA DC (■direct action—increasing level, interface, or density increases output; or ■reverse action—increasing level, interface, or density decreases output)
High saturation: 20.5 mA
Low saturation: 3.8 mA
High alarm: 22.5 mA
Low Alarm: 3.7 mA
Only one of the above high/low alarm definitions is available in a given configuration. NAMUR NE 43 compliant when high alarm level is selected(1) Digital: HART 1200 Baud FSK (frequency shift keyed)
HART impedance requirements must be met to enable communication. Total shunt impedance across the master device connections (excluding the master and transmitter impedance) must be between 230 and 1100 ohms. For purposes of determining the allowable wiring capacitance, the HART "receive impedance" of the transmitter:
At control frequencies may be modeled as—
Rx: 42K ohms and Cx: 14 nF
In the HART normal frequency band of 950 -2500 Hz and above— Rx: 21K ohms and Cx: 12 nF is a better fit
Note that in point-to-point configuration, analog and digital signalling are available. The instrument may be queried digitally for information, or placed in Burst mode to regularly transmit unsolicited process information digitally. In multi-drop mode, the output current is fixed at 4 mA, and only digital communication is available.

Performance

Independent Linearity NPS 3 sensor: ±0.8% of output span
NPS 4 sensor: ±0.5% of output span
Hysteresis plus Dead band: <1.0% of output span
Repeatability NPS 3 sensor: ±0.5% of output span
NPS 4 sensor: ±0.3% of output span
At effective proportional band (PB) <100%, linearity, dead band, and repeatability are derated by the factor (100%/PB)

Sensor Working Pressures(2)

CL600 maximum

Operating Influences

Power Supply Effect: Output changes < ±0.2% of full scale when supply varies between min. and max voltage specifications.
Transient Voltage Protection: The loop terminals are protected by a transient voltage suppressor. The specifications are as follows:

Pulse Waveform		Max VCL (Clamping Voltage) (V)	Max IPP (Pulse Peak @ Current) (A)
Rise Time (μs)	Decay to 50% (μs)	Max VCL (Clamping Voltage) (V)	Max IPP (Pulse Peak @ Current) (A)
10	1000	93.6	16
8	20	121	83
Note: μs = microsecond

Ambient Temperature: The combined ambient temperature effect on zero and span is less than 0.03% of full scale per degree Kelvin over the operating range -40 to 80°C (-40 to 176°F)
Process Density: The sensitivity to error in knowledge of process density is proportional to the differential density of the calibration. If the differential specific gravity is 0.2, an error of 0.02 specific gravity units in knowledge of a process fluid density represents 10% of span.
Electromagnetic Interference (EMI): Tested per IEC 61326-1 (Edition 1.1). Conforms to the European EMC Directive. Meets emission limits for class A equipment (industrial locations) and class B equipment (domestic locations). Meets immunity requirements for industrial locations (Table A.1 in the IEC specification document). Immunity performance is shown in table 1.

Supply Requirements (See figure 8)

12 to 30 volts DC; instrument has reverse polarity protection.
A minimum compliance voltage of 17.75 is required to guarantee HART communication.

Compensation

Transducer compensation: for ambient temperature.

Digital Monitors

Linked to jumper-selected Hi (factory default) or Lo analog alarm signal:
Torque tube position transducer: Drive monitor and signal reasonableness monitor
User-configurable alarms: Hi-Hi and Lo-Lo Limit process alarms
HART-readable only:
Processor free-time monitor.
Writes-remaining in Non Volatile Memory monitor.
User-configurable alarms: Hi and Lo limit process alarms, and Hi and Lo limit electronics temperature alarms

Diagnostics

Output loop current diagnostic.
LCD meter diagnostic.
Spot specific gravity measurement in level mode: used to update specific gravity parameter to improve process measurement
Digital signal-tracing capability: by review of "troubleshooting variables", and
Basic trending capability for PV, TV and SV.

LCD Meter Indications

LCD meter indicates analog output on a percent scale bar graph. The meter also can be configured to display:
Process variable in engineering units only.
Percent range only.
Percent range alternating with process variable or
Process variable, (and degrees of pilot shaft rotation).

Electrical Classification

Hazardous Area:

Intrinsic Safety, Explosion proof,
Dust-Ignition proof

Intrinsic Safety, Explosion proof,
Non-incendive, Dust-Ignition proof

Intrinsic Safety, Flameproof, Type n

Intrinsic Safety, Type n

Flameproof

Intrinsic Safety, Flameproof,
Dust-Ignition proof
Refer to tables 3, 4, 5, 6, 7, and 8 for additional approvals information.
Electrical Housing: Designed to meet NEMA 4X, IEC 60529 IP66

Construction Materials

Case and Cover: Low-copper aluminum alloy
Internal: Plated steel, aluminum, and stainless steel; encapsulated printed wiring boards; Neodymium Iron Boron Magnets

Sensor: See table 2

Mounting Positions

Mounts on top of vessel or on customer supplied cage (see figure 5), can be field-mounted right- or left-of-displacer.

Electrical Connections

Two 1/2-14 NPT internal conduit connections; one on bottom and one on back of terminal box.

Operating Limits

Allowable Process Temperatures(2) .
Maximum: 232°C (450°F). See figure 9.
Ambient Temperature and Humidity

Conditions	Normal Limits(3,4)	Transport and Storage Limits	Nominal Reference
Ambient Temperature	-40 to 80° (-40 to 176°F)	-40 to 85°C (-40 to 185°F)	25°C (77°F)
Ambient Relative Humidity	0 to 95%, (non-condensing)	0 to 95%, (non-condensing)	40%

NOTE: Specialized instrument terms are defined in ANSI/ISA Standard 51.1 - Process Instrument Terminology.
1. Not NAMUR NE 43 compliant If the low alarm level is selected.
2. The pressure/temperature limits in this document and any applicable standard or code limitation should not be exceeded.
3. LCD meter may not be readable below -20°C (-4°F).
4. Contact your Emerson Process Management sales office or application engineer if temperatures exceeding these limits are required.

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Table

Table 1. EMC Immunity Performance Criteria

PORT	PHENOMENON	BASIC STANDARD	TEST LEVEL	PERFORMANCE CRITERIA(1)
Enclosure	Electrostatic discharge (ESD)	IEC 61000-4-2	4 kV contact 8 kV air	B
	EM field	IEC 61000-4-3	80 to 1000 MHz @ 10V/m with 1 kHz AM at 80%	A
	Rated power frequency magnetic field	IEC 61000-4-8	60 A/m at 50 Hz	A
I/O signal/control	Burst	IEC 61000-4-4	1 kV	B
	Surge	IEC 61000-4-5	1 kV (line to ground only, each)	B
	Conducted RF	IEC 61000-4-6	150 kHz to 80 MHz at 3 Vrms	A
1. A = No degradation during testing. B = Temporary degradation during testing, but is self-recovering. Specification Limit = +/- 1% of span.

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Table 2. Wafer-Style Sensor Construction Materials

PART	MATERIAL(2)
Wafer body and torque tube arm	NPS 3, WCC or CF8M (316 stainless steel)
Wafer body and torque tube arm	NPS 4, LCC or CF8M
Torque tube	N05500
Displacer	NPS 3, S31600 (316 stainless steel)
Displacer	NPS 4, S30400 (304 stainless steel)
Trim(1)	S31600
Bolting	NCF coated steel grade B7 studs or cap screws and grade 2H nuts
Torque tube arm gasket and torque tube end gasket	Graphite/stainless steel
1. Trim parts include displacer rod, driver bearing, displacer stem parts, and stem connection parts 2. NACE MR0175-2002 compliant. Meets the metallurgical requirements of NACE MR0175-2002. Environmental limits may apply.

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Table 3. Hazardous Area Classifications—CSA (Canada)

CERTIFICATION BODY	CERTIFICATION OBTAINED	ENTITY RATING	TEMPERATURE CODE	ENCLOSURE RATING
CSA	(Intrinsic Safety) Class/Division Class I,II,III Division 1 GP A,B,C,D,E,F,G per drawing 28B5744	Vmax = 30 VDC Imax = 226 mA Ci = 5.5 nF Li = 0.4 mH	T6 (Tamb ≤ 80°C)	4X
	(Explosion Proof) Class/Division Class I, Division 1 GP B,C,D	- - -	T6 (Tamb ≤ 80°C)	4X
	Class I Division 2 GP A,B,C,D Class II Division 1 GP E,F,G Class III	- - -	T6 (Tamb ≤ 80°C)	4X

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Table 4. Hazardous Area Classifications—FM (United States)

CERTIFICATION BODY	CERTIFICATION OBTAINED	ENTITY RATING	TEMPERATURE CODE	ENCLOSURE RATING
FM	(Intrinsic Safety) Class/Division Class I,II,III Division 1 GP A,B,C,D,E,F,G per drawing 28B5745	Vmax = 30 VDC Imax = 226 mA Pi = 1.4 W Ci = 5.5 nF Li = 0.4 mH	T6 (Tamb ≤ 80°C)	4X
	(Explosion Proof) Class/Division Class I, Division 1 GP A,B,C,D	- - -	T6 (Tamb ≤ 80°C)	4X
	Class I Division 2 GP A,B,C,D Class II Division 1 GP E,F,G Class II Division 2 GP F,G	- - -	T6 (Tamb ≤ 80°C)	4X

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Table 5. Hazardous Area Classifications—ATEX

CERTIFICATE	CERTIFICATION OBTAINED	ENTITY RATING	TEMPERATURE CODE	ENCLOSURE RATING
ATEX	II 1 G D Gas EEx ia IIC T6—Intrinsic Safety Dust T85C (Tamb ≤ 80°C)	Ui = 30 VDC Ii = 226 mA Pi = 1.4 W Ci = 5.5 nF Li = 0.4 mH	T6 (Tamb ≤ 80°C)	IP66
	II 2 G D Gas EEx d IIC T6—Flameproof Dust T85C (Tamb ≤ 80°C)	- - -	T6 (Tamb ≤ 80°C)	IP66
	II 3 G D Gas EEx nCL IIC T6—Type n Dust T85C (Tamb ≤ 80°C)	- - -	T6 (Tamb ≤ 80°C)	IP66

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Table 6. Hazardous Area Classifications—IECEx

CERTIFICATE	CERTIFICATION OBTAINED	ENTITY RATING	TEMPERATURE CODE	ENCLOSURE RATING
IECEx	Ex ia IIC T5—Intrinsic Safety	Ui = 30 VDC Ii = 226 mA Pi = 1.4 W Ci = 5.5 nF Li = 0.4 mH	T5 (Tamb ≤ 80°C)	IP66
IECEx	Ex nA IIC T5—Type n	- - -	T5 (Tamb ≤ 80°C)	IP66

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Table 7. Hazardous Area Classifications—SAA

CERTIFICATE	CERTIFICATION OBTAINED	ENTITY RATING	TEMPERATURE CODE	ENCLOSURE RATING
SAA	Gas Ex d IIC T6—Flameproof	- - -	T6 (Tamb ≤ 80°C)	IP66

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Table 8. Hazardous Area Classifications—NEPSI

CERTIFICATE	CERTIFICATION OBTAINED	ENTITY RATING	TEMPERATURE CODE	ENCLOSURE RATING
NEPSI	Gas Ex ia IIC T6—Intrinsic Safety Dust DIP A21 T6	Ui = 30 VDC Ii = 226 mA Pi = 1.4 W Ci = 5.5 nF Li = 0.4 mH	T6 (Tamb ≤ 80°C)	IP66
NEPSI	Gas Ex d IIC T6—Flameproof Dust DIP A21 T6	- - -	T6 (Tamb ≤ 80°C)	IP66

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