Laurel Electronics LTA DPM User Manual

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LTA “DPM” SERIES

TRANSMITTERS

ANALOG INPUT

4-20 mA, 0-20 mA or 0-10V ANALOG OUTPUT

OWNERS MANUAL

LAUREL Electronics Inc.

3183-G Airway Ave, Costa Mesa, CA, 92626, USA Tel: (714) 434-6131 Fax: (714) 434-3766 Website: www.laurels.com

1. ORDERING GUIDE, LTA “DPM” SERIES TRANSMITTERS

Configure a model number in this format: LTA202DCV1, CBL04

LTA Laureate analog input trans-

mitter with 4-20 mA, 0-20 mA or 0-10V isolated analog output. Includes serial port for programming and isolated 5, 10 or 24V excitation output. Default jumpered for RS232 and 10V excitation.

Main Board

2................ Standard main board

4................ Extended main board

Note: 4 adds rate of change and

custom curve linearization. Not for temperature.

Power

0............................... 85-264 Vac

1............12-32 Vac or 10-48 Vdc

Setpoint Output

0……………………… ….None

2................Dual solid state relays

Input Type

DC Volts

DCV1....................... ..200.00 mV

DCV2............................ 2.0000 V

DCV3............................ 20.000 V

DCV4............................ 200.00 V

DCV5.............................. 600.0 V

DC Amperes

DCA1......................... 2.0000 mA

DCA2.........................20.000 mA

DCA3.........................200.00 mA

DCA4..............................5.000 A

Process Signals

4-20 mA, 0-10V, etc.

P…...4-20 mA in = 4-20 mA out P1…………….Custom Scaling

Specify min input & min output, max input & max output.

RTD Temperature

Pt100, P385C .....-202 to 850°C

Pt100, P385F.... -331 to 1562°F

Pt100, P392C .....-202 to 850°C

Pt100, P392F.... -331 to 1562°F

Ni120, 672C .........-80 to 260°C

Ni120, 672F........ -112 to 500°F

Cu10, 427C...........-97 to 260°C

Cu10, 427F ......... -143 to 500°F

Thermocouple Temperature

JC........................-210 to 760°C

JF...................... -347 to 1400°F

KC .....................-244 to 1372°C

KF .....................-408 to 2501°F

TC .......................-257 to 400°C

TF........................ -430 to 752°F

EC .....................-240 to 1000°C

EF...................... -400 to 1830°F

NC.....................-245 to 1300°C

NF .................... .-410 to 2370°F

SC .......................-46 to 1768°C

SF .......................-51 to 3214°F

RC.......................-45 to 1768°C

RF ....................... -49 to 3213°F

Resistance

R1………………....0-20 ohms

R2…………….….0-200 ohms R3…………...….….0-2 kohms R4……………...….0-20kohms R5……………….0-200 kohms

Strain Gauge, Potentiometer

4-wire ratio. Full scale inputs from 200 mV to 20V.

SG…..0-200 mV in = 4-20 mA SG1………….Custom Scaling

Specify min input & min output, max input & max output.

Load Cells

6-wire ratio. Full scale inputs from 20 to 500 mV.

WM1….....-99,999 to +99,999

Specify min input & min output, max input & max output.

RMS Volts

RMV1 .................... 200.00 mV

RMV2 ....................... 2.0000 V

RMV3 ....................... 20.000 V

RMV4 ....................... 200.00 V

RMV5 ......................... 600.0 V

RMS Amperes

RMA1 ....................2.0000 mA

RMA2 ....................20.000 mA

RMA3 ....................200.00 mA

RMA4 .........................5.000 A

ACCESSORIES

CBL04 ....RS232 cable, LTM

to computer

CBL02 ...USB to DB9 adapter

cable

- 2 -

2. TABLE OF CONTENTS

1. ORDERING GUIDE, 4-20 MA OUTPUT “DPM” SERIES TRANSMITTERS.......................... 2

2. TABLE OF CONTENTS ....................................................................................................... 3

3. INTRODUCTION, 4-20 MA OUTPUT “DPM” SERIES TRANSMITTERS.............................. 4

4. RECEIVING & UNPACKING YOUR TRANSMITTER ........................................................... 5

5. SAFETY CONSIDERATIONS .............................................................................................. 5

6. TRANSMITTER FIELD WIRING ......................................................................................... 6

7. PROGRAMMING YOUR TRANSMITTER............................................................................ 8

8. OPENING YOUR TRANSMITTER CASE ............................................................................. 16

9. DC SIGNAL CONDITIONER BOARD JUMPER SETTINGS .................................................. 17

10. AC SIGNAL CONDITIONER BOARD JUMPER SETTINGS ................................................. 18

11. LOAD CELL SIGNAL CONDITIONER BOARD JUMPER SETTINGS .................................... 19

12. THERMOCOUPLE SIGNAL CONDITIONER BOARD JUMPER SETTINGS .......................... 20

13. RTD & OHMS SIGNAL CONDITIONER BOARD JUMPER SETTINGS................................. 21

14. MAIN BOARD JUMPER SETTINGS ................................................................................... 22

15. DUAL RELAY OPERATION ............................................................................................... 23

16. INPUT SIGNAL FILTERING................................................................................................ 25

17. TRANSMITTER CALIBRATION .......................................................................................... 26

18. CUSTOM CURVE LINEARIZATION .................................................................................... 27

19. 4-20 MA OUTPUT “DPM” SERIES TRANSMITTER SPECIFICATIONS ............................... 28

20. WARRANTY ...................................................................................................................... 32

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3. INTRODUCTION, 4-20 MA “DPM” SERIES TRANSMITTERS

This manual covers DIN rail

input.

The transmitters duplicate the signal conditioning and signal processing features of 1/8 DIN

transmitters with a 4-20 mA, 0-20 mA or 0-10V output and an analog

size, digital panel meter (DPM) counterparts for exceptional accuracy at high read rate.

The current and voltage transmitter outputs are jumper selectable and are transformer isolated to avoid ground loops. The ultra-linear digital to analog converter (DAC) provides 16-bit resolution. The output is scaled in software and tracks an internal linearized digital reading. Output accuracy is ±0.015% of span for all DC analog input signals and ±0.15% of span for AC rms.

A wide range of analog signal sources are accommodated by five signal conditioners:

• DC input for volts, amps, process signals (e.g., 4-20 mA), and strain gauges. Most sensitive full scale input range of 200 mV. Built-in 5A current shunt.

• AC rms input for volts and amps. Can be AC or DC coupled. Built-in 5A current shunt.

• Load cell or microvolt input with selectable full scale input ranges from 20 mV to 500 mV.

• Thermocouple temperature input for seven thermocouple types.

• RTD temperature or Ohms input for Pt100, Ni120 or Cu10 RTDs, 20Ω to 200 kΩ resistance.

An isolated transducer excitation output is standard. Three output levels are jumper selectable: 5V at 100 mA, 10V at 120 mA, or 24V at 50 mA. The factory default setting is 10V and can power up to four 350 ohm load cells in parallel.

Dual solid state relays are standard. These are rated 130 mA at 140 Vac or 180 Vdc.

Serial communications are standard. RS232 or RS485 (half or full duplex) are user selectable via

jumpers and at the connector. The same factory default jumper setting is for RS232 and full duplex RS485.

Isolation to 250V rms is provided for power, signal input, analog output, relay outputs, and communications. Isolation adds safety and avoids possible ground loops. The transducer excitation output is isolated to 50V from signal ground.

Internal jumpers are used to select the signal range, communication type, and excitation level. The transmitter configuration is specified by the model number on the transmitter label. A user can reconfigure the transmitter by opening the case and moving jumpers, as explained in this manual.

Transmitter scaling is via serial connection to a PC using MS Windows based Instrument Setup Software, which can be downloaded at no charge. The required transmitter-to-PC interface cable is available for purchase.

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4. RECEIVING & UNPACKING YOUR TRANSMITTER

Your transmitter was carefully tested and inspected prior to shipment. Should the transmitter be damaged in shipment, notify the freight carrier immediately. In the event the transmitter is not configured as ordered or is inoperable, return it to the place of purchase for repair or replacement. Please include a detailed description of the problem.

5. SAFETY CONSIDERATIONS

Warning: Use of this transmitter in a manner other than specified may impair the protection

of the device and subject the user to a hazard. Do not attempt to operate if the unit shows visible damage.

Cautions:

• This unit may be powered from 95-240 Vac ±10% or with the worldwide voltage power supply option, or from 12-30 Vac or 10-48 Vdc with the low voltage power supply option. Verify that the proper power option is installed for the power to be used.

• The 95-240 Vac ±10% power connector (P1 Pins 1-3) is colored Green to differentiate it from other input and output connectors. The 12-30 Vac or 10-48 Vdc power connector is colored Black. This transmitter has no power switch. It will be in operation as soon as power is applied.

• Do not short out the 0-10V analog output, or apply it to a load of less than 1 kohm, to avoid permanent damage to the main board.

• To avoid dangers of electrocution and/or short circuit, do not attempt to open the case while the unit is under power.

• To prevent an electrical or fire hazard, do not expose the transmitter to excessive moisture. Do not operate the transmitter in the presence of flammable gases or fumes, as such an environment constitutes an explosion hazard.

Symbols used:

Caution (refer to accompanying documents)

Caution, risk of electric shock.

Earth (ground) terminal.

Both direct and alternating current.

Equipment protected throughout by double insulation or reinforced insulation.

Operating environment:

Transmitter Class II (double insulated) equipment designed for use in Pollution degree 2.

- 5 -

See manuals

for different

signal types

Analog out - 1

Analog out + 2

AL2 1

AL2 2 AL1 3 AL1 4

6. TRANSMITTER FIELD WIRING

1 2 3 4 5 6

P6 Signal

input & excitation output

P4 Analog output

P3 Solid state relays

Signal

conditioner

board

P2 Serial

data I/O

P1 Power

input

RS485

6 N/C 5 ARX 4 ATX 3 GND 2 BRX 1 BTX

RS232

TX RX NC GND GND N/C

3 Power GND 2 AC neutral or -DC 1 AC high or +DC

6 TX 5 RX 4 NC 3 GND 2 BRX 1 N/C

Transmitter

RS232 wiring

6 N/C 5 ARX / ATX 4 N/C 3 GND 2 BRX / BTX 1 N/C

Transmitter

RS485 wiring, half duplex

with internal jumpers.

DB9 connector

to PC

(rear view)

ATX / ARX

GND BTX / BRX

Master

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6 N/C 5 ARX 4 ATX 3 GND 2 BRX 1 BTX

ATX ARX GND BTX BRX

Transmitter Master

RS485 wiring, full duplex-

6 N/C 5 ARX

ATX / ARX

4 ATX 3 GND 2 BRX

GND BTX / BRX

1 BTX

Transmitter

Master

RS485 wiring, half duplex

with external jumpers.

P6 - SIGNAL INPUT DETAIL

DC & Externally Powered Process

Excitation return 1

+ Excitation 2

- Signal input 3

+ Signal input 4

2-Wire Process Transmitter

Excitation return 1

+ Excitation 2

- Signal input 3

+ Signal input 4

Strain Gauge

Excitation return 1

+ Excitation 2

- Signal input 3

+ Signal input 4

-DC +DC

Load Cell

Excitation return 1

- Sense 2

- Signal 3

+ Signal 4

+ Excitation 5

+ Sense 6

For 4-wire load cell connection, jumper Pin1 to Pin 2, and Pin 5 to Pin 6.

RTD or Resistance - 2 Wire

Excitation return 1

+ Excitation 2

- Signal input 3

+ Signal input 4

RTD or Resistance - 3 Wire

AC & AC+DC True RMS

Signal High 1

NC 2

Signal Low 3

Signal High 4

2, 20, 200, 600V

AC neutral

0.2V, current

Thermocouple

NC 1 NC 2

- Signal input 3

+ Signal input 4

P4 - ANALOG OUTPUT DETAIL

Driving a Load with 4-20 mA

Analog return 1

4-20 mA output 2

500 Ohms max

Driving a Load with 0-10V

Excitation return 1

+ Excitation 2

- Signal input 3

+ Signal input 4

RTD or Resistance - 4 Wire

Excitation return 1

+ Excitation 2

- Signal input 3

+ Signal input 4

MOUNTING FOR COOLING

AL 1

AL 2

RESET

POWER

AL 1

AL 2

RESET

POWER

AL 1

AL 2

RESET

POWER

AL 1

AL 2

RESET

POWER

AL 1

AL 2

RESET

POWER

AL 1

AL 2

RESET

POWER

AL 1

AL 2

RESET

POWER

Analog GND 1

0-10V output 2

5 kOhms min

Mount transmitters with ventilation holes at top and bottom. Leave minimum of 6 mm (1/4") between transmitters, or force air with a fan.

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7. PROGRAMMING YOUR TRANSMITTER

OVERVIEW

Our transmitters are easily programmed using a PC with an RS232 port and Instrument Setup (IS) software, which provides a graphical user interface. The software allows uploading, editing,

downloading and saving of setup data, execution of commands under computer control, listing, plotting and graphing of data, and computer prompted calibration.

USING IS SOFTWARE

Use a 3-wire RS232 cable (P/N CBL04) to connect your transmitter to the COM port of your PC. Download the file

Install Instrument Setup Software Start => Programs => IS2 => Instrument Setup

created. Following a brief splash screen, the

ISx_x_x.exe

from our website and double-click on the file name. Click on

and follow the prompts. To launch IS software, press on

or on the desktop icon that you may have

Communications Setup

screen will appear.

RS232 cable with rear view of DB9 connector to PC

- 8 -

In the Communications Setup screen, select the factory default setting. Select

RS-232 (USB)

button. This will take you to the

Transmitter LTA, LTM, LTS

Establish Communications

Custom ASCII

as the Device Type. Then click on the

as the protocol, as this is the

screen.

- 9 -

In the

You will be able to change your protocol and baud rate later under the tab. Click on on the

From the

from your DPM transmitter. Click on easily edit the setup file using pull-down menus and other selection tools. You can download (or put) your edited file into the transmitter by clicking on your setup file to disk by clicking on disk by click on

The best way to learn IS software is to experiment with it.

For detailed help on any data entry field under any tab, select that field and press on the F1

key.

Establish Communications

Establish

Main Menu

File

, and the two fields at the bottom of the screen should turn green. Click

button.

, click on

Open

DPM

screen, select your Com Port and

File

View

Get Setup

Save Setup

to retrieve (or get) the existing setup data

Setup

to bring up screens which allow you to

DPM

and retrieve a previously saved file from

9600

as the Baud Rate.

Communication

Put Setup

. You can save

setup

- 10 -

Click on

mitter, then on set up but not the range, which is set by jumpers.

DPM

Get Setup

View

Setup

Signal Input, Display

to retrieve the current setup information from your DPM trans-

, which will take you to the

, and

Control Inputs

Input+Display

. The software reads the signal conditioner type,

50/60 Hz Line Freq

is used for noise rejection.

tab. Use this screen to

Click on the

methods: 1) Scale and Offset method, 2) Coordinates of 2 points method where (Low In, Low Read) and (High In, High Read) data points are entered numerically, and 3) Reading Coordinates of 2 points method, which captures actual readings.

Scaling

tab to scale your transmitter. You will be given the choice of three scaling

- 11 -

Click on the

Filter

tab to set to set up filtering for your readings. The filter time constant can be

automatic, be specified in seconds, or be turned off. The adaptive threshold modifies the time constant in response to noise. A low adaptive threshold is recommended for normal low noise. A high adaptive threshold is recommended for high noise environments.

Click on the

Relay Alarms

tab to set up your transmitter’s two solid state relays, which are

standard. For detailed help on any data entry field under, select that field and press on the F1 key.

- 12 -

Click on the

establish default communications with your transmitter. You can reselect

Address

values to establish initial communications with your PC.

Communication

Serial Protocol

tab to view the communication parameters that you used to

, and

Full/Half Duplex

, even though you may have selected different

Baud Rate, Device

Click on the select

0-20 mA Current, 0-10V Voltage

Range reading

help on any data entry field, select that field and press on the F1 key.

Analog Out

. These will create the two endpoints of your analog output range. For detailed

tab to scale your analog output, which is standard. Under

, or

4-20 mA

- 13 -

. Type in your

Lo Range Reading

Range

and

ADDITIONAL FEATURES

• The Commands pull-down menu allows you to execute certain functions by using your

computer mouse. This menu will be grayed out unless a

• The Readings pull-down menu provides three formats to display input data on your PC

monitor. Use the press

for a hardcopy on your PC printer.

Pause

and

Continue

buttons to control the timing of data collection, then

Get Setup

has been executed.

- List presents the latest internal readings in a 20-row by 10-column table. Press

time to freeze the display. Press

- Plot generates a plot of internal readings vs. time in seconds. It effectively turns the

transmitter-PC combination into a printing digital oscilloscope.

- Graph generates a histogram, where the horizontal axis is the internal reading, and the

vertical axis is the number of occurrences of readings. The display continually resizes itself as the number of readings increases.

for a hardcopy.

Pause

at any

Plot

- 14 -

Graph

• The Jumpers pull-down menu shows jumper positions for the selected signal conditioner

boards and the main board, duplicating information in this manual.

- 15 -

8. OPENING YOUR TRANSMITTER CASE

WHEN TO CHANGE JUMPERS

Most users will never have to open the transmitter case. The transmitters are shipped fully

jumpered and ready for scaling via Instrument Setup software. The factory configuration is specified by the model number on the transmitter label.

Jumpers on the signal board set the signal range. To move jumpers, you will need to open the transmitter. Your selected range should encompass your maximum expected signal levels. All ranges are factory calibrated, with calibration factors stored in EPROM on the signal board.

Jumpers on the main board are used to select the data signal type (RS232, half duplex RS485, or full duplex RS485), excitation level (5, 10 or 24V), and a possible RS485 line termination resistor. Default factory jumpers are RS232 or RS485 (same jumpers), 10V excitation, and no RS485 line termination resistor.

After changing jumper settings, you will need to update your data in Instrument Setup software and on the transmitter label. While this software can sense the transmitter and signal conditioner type, it cannot sense jumper settings which modify the electrical circuit.

HOW TO OPEN & CLOSE THE CASE

The two clamshell halves of the case are held together with 4 bolts and 4 nuts. When removing these, take care to ensure that they are not lost. Separate the case halves. When closing the case, make sure the ventilation grills are properly aligned.

- 16 -

9. DC SIGNAL CONDITIONER BOARD JUMPER SETTINGS

Five voltage and four current ranges are jumper selectable. These also have to be selected in Instrument Setup software.

Board Revision N

Voltage Ranges

±200.00 mV ±2.0000 V ±20.000 V ±200.00 V ±600.00 V

Current Ranges

±2.0000 mA ±20.000 mA ±200.00 mA ±5.000 A

Board Revision P

E1 E2 E3

A A B B B

f h h g

E1 E2 E3

A A A A

e, h d, h

c, h

a, b, h

b a b a a

b b b b

Voltage Ranges Jumpers

FS Input E1 E2

±200.00 mV ±2.0000 V ±20.000 V ±200.00 V ±300V (UL) ±600V (not UL)

Current Ranges Jumpers

A B B B B B

j h g g

FS Input E1 E2

±2.0000 mA ±20.000 mA ±200.00 mA ±5.000 A

A A A A

e, g d, g c, g

a, b, g

- 17 -

10. AC RMS SIGNAL CONDITIONER BOARD JUMPER SETTINGS

Five voltage and four current ranges are jumper selectable. These also have to be selected in Instrument Setup software.

Voltage Ranges Jumpers

200.00 mV

2.0000 V

20.000 V

200.00 V

600.00 V

c, g, h

c, i

c, k

c, m

Current Ranges Jumpers

2.0000 mA

20.000 mA

200.00 mA

5.000 A

Signal Coupling

AC + DC AC only

l, k b, m a, m

c, d, e, m

Jumpers

none

f e d

The flexible noise shield may be removed for jumper setting, but must then be reinstalled.

b a

To minimize noise pickup, the input signal wiring should utilize a shielded twisted pair, and the shield should be connected to signal low at the RMS board, as illustrated below. If signal low is close to earth ground, such as within 2V, signal low can further be connected to earth ground.

Signal Source

Shield around twisted pair

Shielding for AC noise reduction

- 18 -

Sig High Sig Low

Earth Ground

RMS

Board

11. LOAD CELL SIGNAL CONDITIONER BOARD JUMPER SETTINGS

Five ranges are jumper selectable. These also have to be selected in Instrument Setup software.

Load Cell & Microvolt Ranges

FS Input Jumpers

±20.000 mV ±50.000 mV ±100.00 mV ±250.00 mV ±500.00 mV

e a b c d

- 19 -

12. THERMOCOUPLE SIGNAL CONDITIONER BOARD JUMPER SETTINGS

Seven thermocouple types are jumper selectable. These also have to be selected in Instrument Setup software.

Thermocouple Type E4 Jumper

J, K, E, N T, R, S

none

Open T/C Indication E3 Jumper

Upscale Downscale

1. Use 2.5 mm (0.1") jumpers.

2. Store spare jumpers on an unused jumper post.

- 20 -

13. RTD & OHMS SIGNAL CONDITIONER BOARD JUMPER SETTINGS

The same signal conditioner board is used for 4 RTD types and 5 resistance ranges, as selected by jumpers. Corresponding selections also have to be made in Instrument Setup software. With RTDs, display in °C or °F and resolution of 1°, 0.1° or 0.01° are user programmable. 0.01° resolution should only be used for relative readings, not absolute readings, and with software selectable digital filtering.

RTD Type or Ohms E1 Jumper

Pt100, Ni120 Cu10, 20 

200.00 Ω

2000.0 Ω 20000 Ω

200.00 kΩ

a b c d e

Connection E2 Jumper

2- or 4-wire 3-wire

none

1. Use 2.5 mm (0.1") jumpers.

2. Store spare jumpers on an unused jumper post.

PROVISIONS FOR LEAD WIRE RESISTANCE

RTD and resistance measurement allow 2-, 3- or 4-wire hookup to compensate for lead wire

resistance. Please see Section 6 for hookup diagrams.

• In 2-wire hookup, the transmitter senses the voltage drop across the load and both lead

wires. The effect of the lead wires can be measured and subtracted by shorting out the load during transmitter setup, as prompted by Instrument Setup software. The short should be as close as possible to the load. Ambient temperature changes will still cause some error in the readings -- the higher the lead resistance, the greater the error.

• In 3-wire hookup, the transmitter automatically compensates for lead resistance by mea-

suring the voltage drop in one current-carrying lead and assuming that the voltage drop in the other current-carrying lead is the same.

•

In 4-wire hookup, there is no lead wire resistance error, as different pairs of wires are used for excitation and sensing.

- 21 -

14. MAIN BOARD JUMPER SETTINGS

c ab

b cd

Serial Signal Duplex Jumpers Termination Resistor*

E6 a = Transmit

Full None

RS485

E6 c = Receive

Half E6 b + d** E6 c

RS232 Full None None

* The termination resistor jumper settings should only be selected if the transmitter is the last

device on an RS485 line longer than 200 feet (60 m).

** Or jumper external BTX to BRX and ATX to ARX (same effect as internal jumpers).

To reset communications to 9600 baud, command mode, Custom ASCII protocol, and Address 1, place a jumper at E1 and power up the transmitter.

Analog Output Jumpers

Current E2 a + d

Voltage E2 b + c

Excitation Output* Jumpers

5V, 100 mA E3 a + c; E4 a

10V, 120 mA E3 a + c; E4 b

24V, 50 mA E3 b, E4 none

* Attempting to draw more than the rated current will shut down the output.

- 22 -

15. DUAL RELAY OPERATION

The dual solid state relays can operate in a basic alarm mode, in a hysteresis band mode, or in a deviation band modes, as explained below. Setpoint operation is referenced to the digital reading in engineering units that is internal to the transmitter. For example, temperature alarm or control would be referenced to a setpoint in °C or °F.

1000

g n

i d a e

R l a

i g

i D

Setpoint

OFF OFF

Time

1000

g n

i d a e

R l a

i g

i D

Setpoint

OFF

ONON

Time

Active High Basic Alarm Active Low Basic Alarm

A basic alarm changes state automatically when the reading rises above a specified limit, and changes back automatically when the reading falls below that limit. A red LED indicates the relay is in an alarm condition, which can be active high or active low, as programmed.

Heater

OFF

1050

1000

950

g n

i d a e

Fail

Pass

Fail

Setpoint = 1000 Deviation value = 50

1050

1000

950

g n

i d a e

OFF

Setpoint = 1000 Hysteresis value = 50

OFF

Time

Hysteresis Band Alarm Deviation Band Alarm

A hysteresis band alarm controls relay action symmetrically around a setpoint. The relay closes (or opens) when the reading goes above the setpoint plus one hysteresis value, and opens (or closes) when the reading falls below the setpoint less one hysteresis value. A narrow

- 23 -

hysteresis band is often used to minimize relay chatter. A wide hysteresis band can be used for on-off control applications.

A deviation band alarm controls relay action symmetrically around a setpoint. The relay actuates when the reading falls within the deviation band, and de-actuates when the reading falls outside. A deviation value (such as 50 counts) is set up around both sides of the setpoint to create the deviation band. Passbands around a setpoint are often used for component testing.

- 24 -

16. INPUT SIGNAL FILTERING

A moving average filter is selectable in software to process the internal digital readings, which are taken at 60/sec with 60 Hz power and 50/sec with 50 Hz power. Eight moving average settings are selectable with the following equivalent RC time constants: 0.08 sec, 0.15 sec, 0.3 sec, 0.6 sec, 1.2 sec, 2.4 sec, 4.8 sec, 9.6 sec. The longer time constants provide superior noise filtering at the expense of fast response time.

Adaptive moving average filtering allows the transmitter to respond rapidly to actual changes in signal while filtering out normal noise. An adaptive filter threshold causes the moving average filter to be reset to the latest reading when the accumulated difference between individual readings and the filtered reading exceeds that threshold. The accumulated difference is also reset to zero when the latest reading has a different polarity than the filtered reading. The adaptive filter threshold can be selected as low or high. Low is normally selected. High should be selected if the signal has large transients.

- 25 -

17. TRANSMITTER CALIBRATION

All input ranges are calibrated at the factory using NIST certified calibration equipment, and the calibration constants are stored digitally in EEPROM on the signal conditioner board. This allows signal ranges and signal conditioner boards to be changed in the field without transmitter recalibration. Calibration constants for analog outputs are stored in EEPROM on the main board.

If recalibration is required, a transmitter may be returned to the factory or to an authorized distributor. Easy calibration of DC, AC and load cell signal conditioner ranges is also possible with Instrument Setup software, as described in Section 7. Advanced calibration software is available from the factory.

- 26 -

18. CUSTOM CURVE LINEARIZATION

Curve.exe is a DOS-based, executable PC program used to set up an Extended transmitter so that the analog output and internal digital readings have a user-defined, non-linear relationship with the input signal. For example, it allows a transmitter to correct for transducer nonlinearity or to transmit the volume of an irregularly shaped tank based on liquid level. The calculated linearizing parameters are downloaded into non-volatile memory of the transmitter. The curvefitting algorithm uses quadratic segments of varying length and curvature, and includes diagnostics to estimate curve fitting errors. The program is self-prompting, avoiding the need for detailed printed instructions. This manual section is only intended as an introduction.

GETTING STARTED

Download curve.exe from the distribution CD into the same directory that will contain your data files, such as c:\curves. Connect your transmitter to the PC and double-click on curve.exe, which is an executable file. Follow the steps on the computer screens, which will prompt you and provide extensive help information. Pressing R (Enter) returns to the main menu. You will be given the choice of four data entry modes, all of which are explained in detail.

1) Text file entry mode,

2) 2-coordinate keyboard entry mode,

3) 2-coordinate file entry mode, and

4) Equation entry mode.

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19. 4-20 MA “DPM” SERIES TRANSMITTER SPECIFICATIONS

Mechanical

Case dimensions.......................................................................................... 120 x 101 x 22.5 mm

Case mounting................................................................................ 35 mm DIN rail per EN 50022

Electrical connections ..............................................................Detachable screw plug connectors

Environmental

Operating temperature ................................................................................................ 0°C to 55°C

Storage temperature ................................................................................................-40°C to 85°C

Relative humidity ........................................................... 95% from 0°C to 40°C, non-condensing

Power & Electrical

Power to Transmitter ............................85-264 Vac or 90-300 Vdc (DC range is not UL certified)

.................................................................... 12-32 Vac or 10-48 Vdc (low voltage power option)

Power Isolation.................. 250 Vrms between power, analog output, signal input, and serial I/O

Transmitter Setup

Selection of signal ranges & temperature sensors ..............Jumpers on signal conditioner board

Selection of serial format, excitation output, analog output.....................Jumpers on main board

Programming........................................ Via PC using Instrument Setup software and serial cable

Analog to Digital Conversion)

Conversion rate..................................................... 60/sec at 60 Hz power, 50/sec at 50 Hz power

Input resolution ..........................................................................................16 bits (65,536 steps)

Analog Output (standard)

Output Levels.................................................................................... 4-20 mA, 0-20 mA or 0-10V

Compliance at 20 mA..............................................................................10V (0 to 500 ohm load)

Compliance at 10V..........................................................................2 mA (5 kohm load or higher)

Output resolution ........................................................................................16 bits (65,536 steps)

Output accuracy............................. ±0.02% of full span for DC inputs, ±0.1% for AC RMS inputs

Serial I/O (standard)

Serial formats .................................................... RS232 or RS485 (half or full duplex), selectable

Serial protocol ...................... Custom ASCII or Modbus (RTU or ASCII) for programming via PC

Serial connector......................................................................... Detachable screw terminal plugs

Transducer Excitation Output (standard for DC, process, strain, load cell inputs)

Output Isolation ....................................................................................... 50 Vdc to meter ground

Selectable levels ................... 5 Vdc ± 5%, 100 mA; 10 Vdc ± 5%, 120 mA; 24 Vdc ± 5%, 50 mA

Dual Relay Output (standard)

Relay type ...................................................Two solid state relays, SPST, normally open, Form A

Load rating ................................................................................... 130 mA at 140 Vac or 180 Vdc

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Input Signal Noise Rejection

CMV, DC to 60 Hz .........................................................................................................250V RMS

CMR, DC to 60 Hz...............................................................................................................130 dB

NMR at 50/60 Hz ............................................................................. 90 dB with no digital filtering

Input filtering ...................................... Programmable digital time constants from 80 ms to 9.6 s

Signal Conditioner Boards

DC Volts, Amps, Process, Strain Input

Range Input Resistance Input Error

±200.00 mV

±2.0000 V ±20.000 V ±200.00 V

±300.0 V

±2.0000 mA ±20.000 mA ±200.00 mA

±5.000 A

±5.000 A 0.01 Ω

True AC RMS Volts & Amps

Range Input Resistance Input Error

±200.00 mV

±2.0000 V ±20.000 V ±200.00 V

±250.0 V

±2.0000 mA ±20.000 mA ±200.00 mA

±5.000 A

1 G

Ω

1 GΩ

10 M

Ω

10 M

Ω

10 MΩ

0.01% of FS ± 2 counts

100

Ω

10 Ω

Ω

0.01 Ω

0. 1% of FS ± 5 counts

1 MΩ

0.1% of FS from

0% to 100% of FS,

DC or 10 Hz to 10 kHz,

100 Ω

3.0 crest factor.

10 Ω

Ω

0.01 Ω

Coupling ................................................................................. AC or AC + DC (jumper selectable)

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Load Cell & Microvolt Input

Range Input Resistance Input Error

±20.000 mV ±50.000 mV ±100.00 mV

1 GΩ

0.01% of FS ±2 counts

±250.00 mV ±500.00 mV

Max applied voltage ..............................................................................................................100 V

RTD Input

(1°, 0.1° or 0.01° resolution)

Type Excitation Range Conformity Error

Platinum, Pt100

-202 to 850°C

0.03°C

256 µA

 =.00385 (DIN)

Platinum, Pt100

-331 to 1562°F

-202 to 631°C

0.05°F

0.04°C

256 µA

 =.003925 (ANSI)

Nickel, Ni120

-331 to 1168°F

-80°C to +260°C

0.07°F

±0.05°C

256 µA

 =.00672

Copper, Cu10

-112°F to +500°F

-97°C to +260°C

±0.09°F

±0.05°C

5.0 mA

 =.00427

-143°F to +500°F

±0.09°F

RTD connection: ......................................................................................................2, 3 or 4 wire

Span tempco.............................................................................................. ±0.003% of reading/ºC

Zero tempco ........................................................................................................... ±0.03 deg/deg

Sensor lead resistance tempco per conductor, 2-wire....................10 mdeg / Ω / deg up to 10 Ω

Sensor lead resistance tempco per conductor, 3 & 4-wire ...........10 mdeg / Ω / deg up to 100 Ω

Over-voltage protection .................................................................................................... 125 Vac

Open sensor indication ..............................................0 mA or > 20 mA output, jumper selectable

Thermocouple Input

(1° or 0.1° resolution)

Selection of signal ranges & temperature sensors ................................Via jumpers and software

Selection of serial format, excitation output, analog output................Via jumpers on main board

Programming........................................ Via PC using Instrument Setup software and serial cable

Input resistance .................................................................................................................... 1 GΩ

Input current.......................................................................................................................100 pA

Overall input accuracy .................................................................. ± 0.01% of full span ±2 counts

Max lead resistance ..........................................................................1 kΩ max for rated accuracy

Span tempco.............................................................................................. ±0.003% of reading/ºC

Reference junction tempco ..................................................................................... ±0.02 deg/deg

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Over-voltage protection .................................................................................................... 125 Vac

Open sensor indication ..............................................0 mA or > 20 mA output, jumper selectable

Type Range Conformity Error

-210 to 760°C

-347to 1400°F

-244 to 1372°C

-408to 2501°F

0 to 400°C

-257 to 0°C 32 to 752°F

-430 to 32°F

-240 to 1000°C

-400 to 1830°F

-245 to 1300°C

-410 to 2370°F

-46 to +68°C

-51 to +213°F

-45 to 1768°C

-49 to 3214°F

0.09°C

0.16°F

0.10°C

0.17°F

0.03°C

0.20°C

0.05°F

0.36°F

0.18°C

0.32°F

0.10°C

0.17°F

0.12°C

0.22°F

0.17°C

0.31°F

Resistance Input

Range Resolution Excitation Input Error

0-20.000 Ω

0-200.00 Ω 0-2000.0 Ω

0-20000 Ω

0-200.00 kΩ

0-2.0000 MΩ*

1 mΩ

10 mΩ

100 mΩ

1 Ω

10 Ω

100 Ω

5 mA

500 µA

50 µA

5 µA 500 nA 500 nA

0.01% of range ± 2 cts

* Factory special fixed range

Load connection: .....................................................................................................2, 3 or 4 wire

Span tempco.............................................................................................. ±0.003% of reading/ºC

Over-voltage protection .................................................................................................... 125 Vac

Open sensor indication ..............................................0 mA or > 20 mA output, jumper selectable

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20. WARRANTY

Laurel Electronics Inc. warrants its products against defects in materials or workmanship for a period of one year from the date of purchase.

In the event of a defect during the warranty period, the unit should be returned, freight prepaid (and all duties and taxes) by the Buyer, to the authorized Laurel distributor where the unit was purchased. The distributor, at its option, will repair or replace the defective unit. The unit will be returned to the buyer with freight charges prepaid by the distributor.

LIMITATION OF WARRANTY

The foregoing warranty shall not apply to defects resulting from:

1. Improper or inadequate maintenance by Buyer.

2. Unauthorized modification or misuse.

3. Operation outside the environmental specifications of the product.

4. Mishandling or abuse.

The warranty set forth above is exclusive and no other warranty, whether written or oral, is expressed or implied. Laurel specifically disclaims the implied warranties of merchantability and fitness for a particular purpose.

EXCLUSIVE REMEDIES

The remedies provided herein are Buyer’s sole and exclusive remedies. In no event shall Laurel be liable for direct, indirect, incidental or consequential damages (including loss of profits) whether based on contract, tort, or any other legal theory.

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Laurel Electronics LTA DPM User Manual

Specifications and Main Features

Frequently Asked Questions

User Manual