Laurel Electronics LT SERIES User Manual

Download

LT SERIES

TRANSMITTERS

ANALOG INPUT

4-20 MA OUTPUT & RS232 / RS485 I/O

USER 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

Configure a model number in this format: LT20DCV1, CBL04

Transmitter Type

LT......4-20 mA, 0-20 mA or 0-

10V isolated analog output, isolated RS232 or RS485 serial data output, two 120 mA solid state relays, and isolated transducer excitation output.

LTE.... 4-20 mA, 0-20 mA or

0-10V isolated analog output, isolated Ethernet output, two 120 mA solid state relays, and isolated transducer excitation output.

Main Board

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

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

Note: Extended main board

adds rate of change and custom curve linearization. Not applicable to temperature.

Power

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

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

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

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

Process Signals

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

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

Specify min input and output, max input and output.

Strain Gauge, Potentiometer

4-wire ratio. Full scale ranges 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

4- or 6-wire ratio. Full scale ranges from 20 to 500 mV.

WM1........... -99,999 to +99,999

Specify min input and output, max input & 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.......................... 0-20 kohms

R5........................ 0-200 kohms

ACCESSORIES

CBL04.......RS232 cable, trans-

mitter to computer

CBL02.......USB to DB9 adapter

cable

- 2 -

2. TABLE OF CONTENTS

1. ORDERING GUIDE ............................................................................................................ 2

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

3. PRODUCT OVERVIEW....................................................................................................... 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 ............................................................................. 15

9. DC SIGNAL CONDITIONER BOARD JUMPER SETTINGS .................................................. 16

10. AC SIGNAL CONDITIONER BOARD JUMPER SETTINGS ................................................. 17

11. LOAD CELL SIGNAL CONDITIONER BOARD JUMPER SETTINGS .................................... 18

12. THERMOCOUPLE SIGNAL CONDITIONER BOARD JUMPER SETTINGS .......................... 19

13. RTD & OHMS SIGNAL CONDITIONER BOARD JUMPER SETTINGS................................. 20

14. MAIN BOARD JUMPER SETTINGS ................................................................................... 21

15. DUAL RELAY OPERATION ............................................................................................... 22

16. INPUT SIGNAL FILTERING................................................................................................ 23

17. TRANSMITTER CALIBRATION .......................................................................................... 23

18. CUSTOM CURVE LINEARIZATION .................................................................................... 24

19. MODBUS PROTOCOL TRANSMITTER COMMUNICATIONS .............................................. 25

20. CUSTOM ASCII PROTOCOL TRANSMITTER COMMUNICATIONS .................................... 30

21. SPECIFICATIONS, LT SERIES ANALOG INPUT TRANSMITTER ........................................ 35

22. WARRANTY ...................................................................................................................... 40

- 3 -

3. PRODUCT OVERVIEW

This manual covers LT Series DIN rail transmitters

outputs, dual relays, and and an analog input signal conditioner. DIN rail transmitters

with isolated 4-20 mA and Ethernet outputs, dual relays, and an analog input

with isolated 4-20 mA and RS232/RS485

A separate manual covers LTE Series

signal conditioner.

LT Series transmitters duplicate the signal conditioning and signal processing features of their 1/8 DIN panel-mounted digital panel meter counterparts for exceptional accuracy at high read rate.

A wide range of analog signal sources are accommodated by five analog 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, or 20Ω-200 kΩ resistance.

An isolated 4-20 mA, 0-20 mA or 0-10V output is standard.

This output is generated by an

ultra-

linear 16-bit digital to analog converter which tracks an internal linearized digital reading.

An isolated serial communications output is standard. The transmitter serial port is default jumpered for RS232 or full-duplex RS485 (same jumper settings). Half-duplex RS485 is also selectable either via internal or external jumpers. Three serial protocols are software selectable: Modbus RTU, Modbus ASCII and Custom ASCII. Modbus allows devices by different manufacturers to be addressed on the same data line. The simpler Custom ASCII protocol is recommended when there are no devices by other manufacturers on the same data line.

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.

Two isolated solid state relays are standard. These are rated 120 mA at 140 Vac or 180 Vdc.

Isolation to 250V rms is provided for power, signal input, analog output, relay outputs, and com-

munications. 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.

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.

- 4 -

4. RECEIVING & UNPACKING YOUR TRANSMITTER

4006497

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 85-264 Vac or with the worldwide voltage power supply option, or from 12-32 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 85-264 Vac power connector (P1 Pins 1-3) is colored Green to differentiate it from other input and output connectors. The 12-32 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.

• 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 applicable to this product:

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.

ETL Mark. Indicates that product conforms to UL Std. 61010-1 and is

CE Mark. Indicates that product meets

certified to CAN/USA Std. C22.2 No.

EU safety, health and environmental

61010-1

requirements.

Operating environment:

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

- 5 -

See manuals

for different

signal types

Control input 2

Control input 1

GND

Analog out - 1

Analog out + 2

AL2 1

AL2 2 AL1 3 AL1 4

6. TRANSMITTER FIELD WIRING

1 2 3 4 5 6

1 2 3

P6 Signal

input & excitation output

P5 Control inputs 1 & 2

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

DB9 connector

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

ATX ARX GND BTX BRX

to PC

Transmitter

RS232 wiring

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

Transmitter Master

RS485 wiring, half duplex

with internal jumpers.

(rear view)

ATX / ARX

GND BTX / BRX

- 6 -

Transmitter

RS485 wiring, full duplex-

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

Transmitter

RS485 wiring, half duplex

with external jumpers.

Master

ATX / ARX

GND BTX / BRX

Master

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.

- 7 -

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

RS232 cable with rear view of DB9 connector to PC

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.

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

(USB)

button. This will take you to the

Transmitter LTA

Establish Communications

- 8 -

Custom ASCII

as the Device Type. Then click on the

as the protocol, as this is the

screen.

RS-232

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

View

File

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

- 9 -

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

- 10 -

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.

- 11 -

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

- 12 -

. 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

- 13 -

Graph

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

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

- 14 -

8. OPENING YOUR TRANSMITTER CASE

WHEN TO CHANGE JUMPERS

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

shipped fully jumpered and ready for scaling. The signal conditioner type, range and temperature sensor are specified by the model number on the transmitter label.

To select a different signal conditioner range, you may open the transmitter case and change jumper settings. Your selected range should encompass your maximum expected signal levels. All ranges of each signal conditioner board are factory calibrated, with calibration factors stored in EPROM on the board.

The selection serial signal (RS232 or RS485) and excitation (5V, 10V or 15V) is achieved by jumpers on the main board. The factory default setting for the serial signal level is RS232. The default excitation setting for pulse input transmitters is 10V.

After changing jumper settings, you will need to enter the new information into Instrument Setup software. While this software can sense the instrument type (transmitter, panel meter or counter) and signal conditioner type, it cannot sense jumper settings which modify the electrical circuit. You should also update the information on the transmitter label.

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 grates are properly aligned.

- 15 -

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 Revisions Q and R

Voltage Ranges Jumpers

FS Input E1 E2 E3

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

Current Ranges Jumpers

A A B B B B

h h g g

f f

b a b a a a

FS Input E1 E2 E3

±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

b b b b

Use 5 mm (0.2") jumpers for locations E1 designated by a capital letter.

Use 2.5 mm (0.1") jumpers for locations E2 and E3 designated by a lower case letter

Store spare jumpers on an unused jumper post not associated with a capital letter.

e d

- 16 -

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.

Board Revision S

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

1. Use 2.5 mm (0.1") jumpers

l, k b, m a, m

c, d, e, m

Jumpers

none

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

2. Store spare jumpers on an unused jumper post.

f e d

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

- 17 -

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

1. Use 2.5 mm (0.1") jumpers

e a b c d

2. Store spare jumpers on an unused jumper post.

- 18 -

12. THERMOCOUPLE SIGNAL CONDITIONER BOARD JUMPER SETTINGS

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

Board Revision A

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.

PNP transistor

J5-X

1 2

J5-Y

3 4

c + b

- Sig + Sig

- 19 -

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.

Board Revision A

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. The sense wires only carry a few picoamperes and hence can measure the voltage across the RTD without error.

- 20 -

14. MAIN BOARD JUMPER SETTINGS

a b

cab

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

Jumper settings are for main board Rev J.

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.

- 21 -

15. DUAL RELAY OPERATION

Dual solid state relays are standard and can operate in a basic alarm mode, in a hysteresis band mode, or in a deviation band mode. Setpoint operation is referenced to the digital reading in engineering units that is internal to the transmitter.

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

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

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

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

In deviation band alarm, 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 on both sides of the setpoint. Passbands are often used for component testing.

- 22 -

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 settings are selectable with t equivalent RC time constants from 0.08 sec to 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.

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 without 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.

- 23 -

18. CUSTOM CURVE LINEARIZATION

Curve.exe is a DOS-based, executable PC program used to set up an Extended transmitter so that the 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. Calculated linearizing parameters are downloaded from a PC into non-volatile memory of the transmitter. The curve-fitting 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.

To get started, download curve.exe from our website into the directory that will also 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 computer prompts and extensive help information. Pressing R (Enter) returns to the main menu. You will be given the choice of four data entry modes, which are explained in detail.

- 24 -

19. MODBUS PROTOCOL TRANSMITTER COMMUNICATIONS

1.0 GENERAL

The Modbus capability conforms to the Modbus over Serial Line Specification & Implementation guide, V1.0. Both the Modbus RTU and Modbus ASCII protocols are implemented. This 5-page manual section presents key programmable Modbus features. Our detailed Modbus manual can be downloaded from http://www.laurels.com/downloadfiles/modbus.pdf

Modbus RTU

Baud Rate........... 300, 600, 1200, 2400, 4800, 9600 or 19200

Data Format ....... 1 start bit, 8 data bits, 1 parity bit, 1 stop bit (11 bits total)

Parity.................. None, Odd, Even (if None, then 2 Stop bits for 11 total)

Address.............. 0 for broadcast, 1-247 for individual meters

Modbus ASCII

Baud Rate........... 300, 600, 1200, 2400, 4800, 9600 or 19200

Data Format ....... 1 Start bit, 7 Data bits, 1 Parity bit, 1 Stop bit (10 bits total)

Parity.................. None, Odd, Even (if None, then 2 Stop bits for 10 total)

Address.............. 0 for broadcast, 1-247 for individual meters

2.0 FRAMING

Modbus RTU: Message frames are separated by a silent interval of at least 3.5 character times.

If a silent interval of more than 1.5 character times occurs between two characters of the message frame, the message frame is considered incomplete and is discarded. Frame Check = 16 bit CRC of the complete message excluding CRC characters.

Modbus ASCII: The message begins immediately following a colon (:) and ends just before a Carriage Return/ Line Feed (CRLF). All message characters are hexadecimal 0-9, A-F (ASCII coded). The system allowable time interval between characters may be set to 1, 3, 5 or 10 seconds. Frame Check = 1 byte (2 hexadecimal characters) LRC of the message excluding the initial colon (:) and trailing LRC and CRLF characters.

3.0 ELECTRICAL INTERFACE

RS232, two-wire half-duplex RS485, or four-wire full-duplex RS485 signal levels are selectable via jumpers on the transmitter main board and a the connector. Please see Section 13. The RS485 selection provides a jumper selection for insertion of a line termination resistor. In case of a long line (greater then 500 ft) to the first device, a termination resistor should be selected for the first device. In case of a long line between the first and last devices, a termination resistor should be selected for the first and last devices. Never add termination resistors to more than two devices on the same line.

- 25 -

4.0 COMMUNICATIONS SETUP

Parameters selectable via Instrument Setup software, distributed on CD ROM:

Serial Protocol ...............................Custom ASCII, Modbus RTU, Modbus ASCII

Modbus ASCII Gap Timeout...........1 sec, 3 sec, 5 sec, 10 sec

Baud Rate.......................................300, 600, 1200, 2400, 4800, 9600, 19200

Parity .............................................No parity, odd parity, even parity

Device Address .............................0 to 247

5.0 SUPPORTED FUNCTION CODES

FC03: Read Holding Registers

Reads internal registers containing setup parameters (Scale, Offset, Setpoints, etc.)

FC10: Write Multiple Registers (FC10 = 16 dec) Writes internal registers containing setup parameters (Scale, Offset, Setpoints, etc.)

FC04: Read Input Registers

Reads measurement values and alarm status. Returns values in 2's Complement Binary Hex format without a decimal point. The displayed system decimal point can be read with FC03 at address 0057. Use only odd Register Addresses and an even number of Registers.

------- ----------------------------------------------00 01 Returns Hi word of Alarm status 00 02 Returns Lo word of Alarm status 00 03 Returns Hi word of Measurement value 00 04 Returns Lo word of Measurement value 00 05 Returns Hi word of Peak value 00 06 Returns Lo word of Peak value 00 07 Returns Hi word of Valley value 00 08 Returns Lo word of Valley value

FC05: Write Single Coil

Action command to meter

Output Output Address Value Action Command

------- -------- ---------------------------------------00 01 FF 00 Transmitter Reset (No Response) 00 02 FF 00 Function Reset (Peak, Valley) 00 03 FF 00 Latched Alarm Reset 00 04 FF 00 Peak Reset 00 05 FF 00 Valley Reset 00 0C FF 00 Tare Command (Weight Transmitter) (00 00 resets Tare)

- 26 -

FC08: Diagnostics

Returns total number of Exception Code 6 (Slave Busy)

Checks communications between the Master and Slave, and returns the count in the Modbus Slave counters (which are reset when the meter is reset).

Hex Sub

Function

Data

Send

Response

Description

Data

Code

00 00 Any Same

Returns Query Data (N x 2 bytes). Echo Request.

as sent

00 01

Restarts Communications. If in the Listen-Only mode, no response occurs. Takes Slave out of the Listen-Only mode and one of the following:

FF 00

00 00

FF 00

00 00

Clears communications event counters. Does not clear communications event counters.

00 04 00 00 None Forces Listen-Only. All addressed and broadcast

Messages are monitored and counters are incremented, but no action is taken or response sent. Only SubFunction 00 01 causes removal of this Listen-Only state.

00 0A 00 00 00 00 Clears all Modbus slave counters.

00 0B 00 00 Total

Message

Count

Returns total number of messages detected on the bus, including those not addressed to this Slave. Excludes bad LRC/CRC, parity error or length < 3.

00 0C 00 00 Checksum

Error

Count

00 0D 00 00 Exception

Error

Count

00 0E 00 00 Slave

Message

Count

00 0F 00 00 No

Response

Count

00 11 00 00 Slave

Busy

Returns total number of messages with bad LRC/ CRC, parity or length < 3 errors detected on the bus including those not addressed to the Slave.

Returns total number of Exception responses returned by the Addressed Slave or that would have been returned if not a broadcast message or if the Slave was not in a Listen-Only mode.

Returns total number of messages, either broadcast or addressed to the Slave. Excludes bad LRC/CRC, parity or length < 3 errors.

Returns total number of messages, either broadcast or addressed to the Slave, for which Slave has returned No Response, neither a normal response nor an exception response. Excludes bad LRC/CRC, parity or length < 3 errors.

responses.

- 27 -

6.0 SUPPORTED EXCEPTION RESPONSE CODES

Code Name Error Description

---- -------------------- -----------------------------------------------------01 Illegal Function Illegal Function Code for this Slave. Only hex Function Codes 03, 04, 05, 08, 10 (dec 16) are allowed. 02 Illegal Data Address Illegal Register Address for this Slave. 03 Illegal Data Value Illegal data value or data length for the Modbus protocol. 04 Slave Device Failure Slave device failure (eg. Transmitter set for external gate).

7.0 MESSAGE FORMATTING

MA = Meter Address DD = Data (Hex) CL = CRC Lo Byte FC = Function Code WW = Data (On/Off) CH = CRC Hi Byte RA = Register Address SF = Sub-Function CR = Carriage Return NR = Number of Registers EC = Error Code LF = Line Feed NB = Number of bytes LRC = ASCII Checksum

Modbus RTU Format

FC Action

Request

Response

Request

Response

Request

Response

Request

Response

Request

Response

Exception Response

> 3.5

Char

NoTx NoTx

1 2 3 4 5 6 7 8 9 10 11

MA MA

FC FC

NoTx MA FC

DD*

SF SF

RA RA

SF SF

RA RA

EC CL CH

Byte Number

DD*

WW WW

NR NR

WW WW

NR NR

CL CL

+80

DD* = (DD DD) times NR (Number of Registers)

CH CH

DD*

DD* CL CH

- 28 -

Modbus ASCII Format

FC Action

1 2 3 4 5 6 7 8 9 10 11 12 13

Request

Response : :

Request

Response : :

Request

Response : :

Request

Response : :

Request

Response : :

Exception

: MA FC

Response

DD* = (DD DD) times NR (Number of Registers)

8.0 MESSAGE EXAMPLES

MA MA

FC FC

+80

Byte Number

RA NB

RA RA

SF SF

DD*

RA RA

SF SF

RA RA

DD*

WW WW

NR NR

LRC

WW WW

NR NR

LRC

LRC LRC

LRC

CR CR

DD*

LF LF

DD*

LRC CR LF

EC LRC CR LF

All examples are for Transmitter Address = 01 and No Parity.

Ser_4 ->

Action

Addr ->

Restart Communications

Request Response*

Meter Reset Request

Response

Digital Reading

** *** Write Setpoint 1 = +37.00*** Read Setpoint 1 = +37.00***

Request Response Request Response Request Response

Modbus RTU

010 001

010800010000B1CB 010800010000B1CB

01050001FF00DDFA

None

01040003000281CB

010404000009D67C4A

0110000100020400000E743624

01030400000E74FE74

01030001000295CB

01030400000E74FE74

:0110000100020400000E7466crlf

Modbus ASCII

020 001

:010800010000F6crlf :010800010000F6crlf :01050001FF00FAcrlf

None

:010400030002F6crlf

:010404000009D618crlf

:011000010002ECcrlf

:010300010002F9crlf

:01030400000E7476crlf

* Suggested as first message after power-up. If transmitter is in Listen-Only mode, no response is returned. ** Example while reading +25.18 *** Decimal point is ignored.

9.0 INTERNAL REGISTERS: Please refer to the full Modbus Protocol Communications Manual, which is downloadable from our website.

- 29 -

20. CUSTOM ASCII PROTOCOL TRANSMITTER COMMUNICATIONS

1.0 SERIAL COMMUNICATION FORMAT

Mode ................ Full Duplex (Separate transmit and receive lines) and Half Duplex (RS485 only)

Baud Rate ......... 300, 600, 1200, 2400, 4800, 9600, 19200 selectable with Instrument Setup

software.

Parity ................ None

Word length...... 8 data bits

Stop bit ............ 1

The Custom ASCII protocol is simpler than the Modbus protocol. This 5-page manual section provides some of its key programmable features. Our detailed Serial Communications manual can be downloaded from http://www.laurels.com/downloadfiles/serialcom2.pdf

2.0 MEASUREMENT DATA FORMAT

The basic measurement data format consists of 8 ASCII characters for analog input “DPM” transmitters, such as +999.99<CR>, where <CR> is the carriage return character. The first character is always a plus or minus sign. A decimal point is always furnished, even when it follows the last digit.

Adding a Line Feed Character to the Basic Format: Printers and other devices that receive the data may require a line feed character <LF> following the <CR>. The line feed character <LF> may be selected using Instrument Setup software.

Adding a Coded Data Character to the Basic Format: A coded character from A to H may be added to the data string according to the table below to indicate the alarm and overload status of the device. If used, this character precedes the <CR>, so that it is the last printable character in the string. With the optional <LF> and coded character selected, the data string will consist of 10 characters for analog input “DPM” transmitters, such as +999.99A<CR><LF>.

Alarm Status No Overload Overload

Neither Alarm set Alarm 1 set only Alarm 2 set only Both Alarms set

A B C

F G H

For example, a coded character “G” indicates that Alarm 2 only is set and that the transmitter is in the overload condition. This information is useful when data is supplied to a computer for listing and analysis, or when data is supplied to a Remote Display in a Master-Slave configuration.

- 30 -

Values are transmitted in a continuous string with no intervening spaces. If the 5th digit in is set to 1 using Instrument Setup software, the termination characters of <CR> and optional <LF> appear after each value. If the 5th digit is et to 0, the termination characters appear only once at the end of the string. In either case, if included, the coded character appears at the end of the last value only.

3.0 NETWORK CONFIGURATIONS

Using the Custom ASCII protocol, TM Series transmitters can operate in a point-to-point mode using RS232 or RS485, or in a multi-point mode using RS485.

The point-to-point mode is a direct connection between a computer (or other digital device) and the transmitter. Any device address can be selected; however, it is suggested that address 1 be selected as a standard for the point-to-point mode.

The multi-point mode is a connection from a host computer to a multiplicity of transmitters bused together with their inputs and outputs connected in parallel. For long cable runs, the last device should have a termination resistor installed. It is necessary to set up each device on the bus with a different address from 1 to 31. To command a particular device, its address is used in conjunction with the command, and only that device responds. The outputs of all of the devices on the bus are set to a high impedance state, except the device being addressed. The device addresses range from 1 to 31, with 0 being a special address to which a meter responds only internally (e.g. Reset), but does not transmit any response on the output lines. All devices may be commanded simultaneously with a 0 address, and there will not be any output response contention. Addressing of transmitters can be set with Instrument Setup software.

4.0 COMMAND MODE OVERVIEW

Using the Custom ASCII protocol, TM Series transmitters operate in the Command Mode only. In this mode, the device does not send data automatically, but responds to commands received from a host computer. These commands can be:

• To transmit the latest or peak measurement

• To reset the meter completely or just the peak value and/or latched alarms

• To display a value sent from the computer

• To transmit present setup parameters

• To receive new setup parameters,

• To monitor or alter data in selected memory locations of the meter.

5.0 COMMAND MODE FORMAT

CHAR 1 - Command Identifier

All commands begin with “*” followed by the meter address, then a command letter followed by a sub-command number or letter. Additional characters may be appended. All commands terminate with <CR> (<LF> ignored).

- 31 -

Char # Character Description

1 2 3 4

* 0-V A-Z 0-U

Command Identifier. Recognition Character. Device Address. 0 addresses all devices, 1-V specific devices. Command Function Sub-command. Number of Bytes of RAM or Words (2 Bytes) of non-volatile memory data being transferred.

CHAR 2 - Address Codes

A Serial Communications Address Code from 1 to V follows the “*” to indicate the device address number from 1 to 31.

Device #

1 2 3 4 5 6 7 8

9 10 11

Address

Code

1 2 3 4 5 6 7 8 9 A B

Device #

13 14 15 16 17 18 19 20 21 22

Address

Code

F G H

I J K L

Device #

24 25 26 27 28 29 30 31

Address

Code

N O P Q R S

T U V

CHARS 3 & 4 - Commands and Subcommands

The examples below use a default address of 1 following the “*“. Substitute the desired address from the above table of Serial Comm Address Codes. All command sequences shown must terminate with <CR>, followed by an optional <LF>.

Request DPM Values

Get reading** *1B1 Peak reading *1B2 Valley reading *1B3

** The meter transmits the value or values selected with Instrument Setup software.

Reset Functions, DPM Transmitter

Cold reset *1C0 Reads NVMEM into RAM locations after RAM is zeroed. Latched alarms reset *1C2

- 32 -

Peak value reset *1C3 Remote display reset *1C4 Valley reset *1C9 Tare function *1CA Tare reset *1CB

6.0 READING AND WRITING TO RAM AND NONVOLATILE MEMORY

CHAR 1, 2: The Recognition character and Meter Address Code are the same as shown in

previous table.

CHAR 3: Command character:

G Read bytes from RAM Memory F Write bytes to RAM Memory (DPM and Scale meter only) R Read bytes from Upper RAM Memory Q Write bytes to Upper RAM Memory X Read words from Non-Volatile Memory W Write words to Non-Volatile Memory

CHAR 4: Command character. Sub-command. Number of Bytes of RAM or Words (2 Bytes) of non-volatile memory data being transferred.

Code # Number Code # Number Code # Number

1 2 3 4 5 6 7 8 9 A

1 2 3 4 5 6 7 8 9

C D E

F G H

J K

11 12 13 14 15 16 17 18 19 20

M N O

P Q R

T U

21 22 23 24 25 26 27 28 29 30

CHAR 5, 6: See tables for the RAM MEMORY ADDRESSES and NONVOLATILE MEMORY ADDRESSES with their respective data definitions.

- 33 -

General, Reading and Writing Ram Memory Data

RAM memory data is read and written as a continuous string of bytes consisting of 2 hex characters (0-9,A-F) per byte. Included in the command are the total number of bytes to be transferred and the most significant address in RAM of the continuous string of bytes. The format is:

Read lower RAM data *1Gnaa Write lower RAM data *1Fnaa<data> Read upper RAM data *1Rnaa Write upper RAM data *1Qnaa<data> where: n is the number of bytes to be read or written.

aa is the most significant address in RAM of the bytes to be read

or written.

<data> is n bytes of 2 hex characters per byte in order from the most

to the least significant byte. The number of bytes n consists of a single code character representing values from 1 to 30 as shown above under CHARACTER 4. The most significant address aa consists of 2 hex characters as shown below under RAM MEMORY ADDRESSES AND DATA DEFINITIONS.

General, Reading and Writing Nonvolatile Memory Data

Nonvolatile data is read and written as a continuous string of words consisting of 2 bytes or 4 hex characters (0-9,A-F) per word. Included in the command is the total number of words to be transferred and the most significant address in nonvolatile memory of the continuous string of words. The format is:

Read nonvolatile memory data *1Xnaa (followed by Meter reset) Write non-volatile memory data *1Wnaa <data> (followed by Meter reset)

where: n is the number of words to be read or written. aa is the most significant address in nonvolatile memory of the words to be

read or written.

<data> is n words of 2 bytes or 4 hex characters per word in order from the most to

the least significant address.

The coded number of words n consists of a single character representing values from 1 to 30 as shown under CHARACTER 4. The most significant address aa consists of 2 hex characters as shown under NONVOLATILE MEMORY ADDRESSES.

- 34 -

21. LT SERIES ANALOG INPUT 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 ETL certified)

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

Power Isolation....... 250 Vrms between power, signal input, analog output, relays, 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 500Ω load)

Compliance at 10V..............................................................................2 mA (5 kΩ 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 ................................................................................... 120 mA at 140 Vac or 180 Vdc

- 35 -

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 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

±0.000 mA

±200.00 mA

±5.000 A

1 G

Ω

1 GΩ

10 M

Ω

10 M

Ω

10 MΩ

100

Ω

0.01% of FS ± 2 counts

10 Ω

1 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)

- 36 -

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 µdeg / Ω / deg up to 10 Ω

Sensor lead resistance tempco per conductor, 3 & 4-wire ............10 µdeg / 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

- 37 -

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 counts

* 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

- 38 -

- 39 -

22. 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.

- 40 -

Laurel Electronics LT SERIES User Manual

Specifications and Main Features

Frequently Asked Questions

User Manual