Emerson 1700, 2700 2Safety parameters, Hazardous area voltage, Hazardous area current

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Output Wiring – Model 1700/2700 Intrinsically Safe Transmitters

WARNING

A transmitter that has been improperly wired or installed in a hazardous area could cause an explosion.

To reduce the risk of an explosion:

•Make sure the transmitter is wired to meet or exceed local code requirements.

•Install the transmitter in an environment that complies with the classification tag on the transmitter. See Appendix A.

Table 5-2Safety parameters

		Value

Parameter	4–20 mA output	Frequency/discrete output

Voltage (Ui)	30 V	30 V

Current (Ii)	300 mA	100 mA

Power (Pi)	1.0 W	0.75 W

Capacitance (Ci)	0.0005 μF	0.0005 μF

Inductance (Li)	0.0 mH	0.0 mH

Hazardous area voltage

The Model 1700 or 2700 transmitter’s safety parameters require the selected barrier’s open-circuit voltage to be limited to less than 30 VDC (Vmax = 30 VDC). This voltage is the combination of the maximum safety barrier voltage (typically 28 VDC) plus an additional 2 VDC for HART communications when communicating in the hazardous area.

Hazardous area current

The Model 1700 or 2700 transmitter’s safety parameters require the selected barrier’s short-circuit currents to sum to less than 300 mA (Imax = 300 mA) for the milliamp outputs and 100 mA (Imax = 100 mA) for the frequency/discrete output.

Hazardous area capacitance

The capacitance (Ci) of the Model 1700 or 2700 transmitter is 0.0005 μF. This value added to the wire capacitance (Ccable) must be lower than the maximum allowable capacitance (Ca) specified by the I.S. barrier. Use the following equation to calculate the maximum length of the cable between the transmitter and the barrier:

Ci + Ccable ≤ Ca

Hazardous area inductance

The inductance (Li) of the Model 1700 or 2700 transmitter is 0.0 mH. This value plus the field wiring inductance (Lcable), must be lower than the maximum allowable inductance (La) specified by the I.S. barrier. The following equation can then be used to calculate the maximum cable length between the transmitter and the barrier:

Li + Lcable ≤ La

38	Micro Motion® Model 1700 and 2700 Transmitters

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Contents Micro Motion Model 1700 Model 2700 Transmitters Page Contents Index Safety Before You BeginOverview Flowmeter components Transmitter installation procedures Flowmeter documentation 1Flowmeter documentation resourcesMicro Motion customer service Installing the Transmitter Installation architecture1Installation types AC power requirements Temperature limitsPower source Determining an appropriate locationDC power requirements 1Typical power cable resistances at 68 F 20 C2Maximum cable lengths Accessibility for maintenanceMaximum cable lengths Mounting the transmitterIntegral installations 2Rotating the transmitter34-wire remote Wall mount or pipe mount 3 9-wire remote installations 59-wire remote Wall mount or pipe mount6Transmitter/core processor assembly Exploded view Mounting the remote core processor7Remote core processor Wall mount or pipe mount Grounding the flowmeter components 3Grounding methods for flowmeter componentsSupplying power Rotating the displayInstalling the Transmitter 10Display components Wiring the Transmitter to the Sensor Cable types1 4-wire cable 2 9-wire cableWiring for 4-wire remote installations 3Wiring to the mating connector Wiring for 9-wire remote installations Core processor on transmitterSubtask 1 Wire the remote core processor to the transmitter 5Cable glands 7Wrapping the shield drain wires 10Gland body and core processor housing Subtask 2 Wiring the sensor to the remote core processor 129-wire cable between sensor and core processorWiring the Transmitter to the Sensor Output terminals and output types Output Wiring Model 1700/2700 Analog TransmittersOutput wiring 1Terminals and output types1Basic analog wiring 2HART/analog single-loop wiring Smart Family Output Wiring Intrinsically Safe Safe area output wiring Safe area mA output wiring2Safe area mA output load resistance values Safe area frequency/discrete output wiring 5Safe area frequency/discrete output wiringHazardous area output wiring Hazardous area safety parametersHazardous area current 2Safety parametersHazardous area voltage Hazardous area capacitanceHazardous area mA output wiring Hazardous area frequency/discrete output wiringHazardous area Output Wiring Model 2700 Configurable I/O Transmitters Channel configuration1Channel configuration MA output wiring2Basic mA wiring Frequency output wiring 5Frequency output Terminals 3 & 4 Channel B Internal power 7Frequency output Terminals 5 & 6 Channel C Internal power Discrete output wiring 9Discrete output 1 Terminals 3 & 4 Channel B Internal power11Discrete output 2 Terminals 5 & 6 Channel C Internal power Volts Voltage Output Level High Discrete input wiring 2Input voltage ranges for external power16Discrete input Terminals 5 & 6 Channel C Internal power Micro Motion Model 1700 and 2700 Transmitters Foundation fieldbus wiring 1Connecting the fieldbus communication wiresPROFIBUS-PA wiring 2Connecting the PROFIBUS-PA communication wiresPower connection SpecificationsFunctional specifications Service port connectionInput/output signals Input signal from sensor Core processor connectionFisco and Fnico approval Specifications Operating Absolute minimum = 100 Ohms for V supply 25.6 volts Specifications HART/Bell202 Service portDigital communication Foundation fieldbus or PROFIBUS-PA transmittersAmbient temperature effect Power supplyEnvironmental requirements Ambient temperature limits EMC complianceOutputs UL and CSATransmitter Atex and IECExHousing Performance specificationsPhysical specifications MountingWeight DimensionsInterface/display Dimensions in inchesmm Inches Dimensions in mm Or M20 × 11/16 160 13/16 139 ″-14 NPT 158 182 × Ø3/8 13/16 148 15/16 × 1/2″-14 NPT Figure A-5Dimensions Remote core processor Index AtexRemote core processor with remote Index Micro Motion Model 1700 and 2700 Transmitters Page 20001700