Pico technology Pt-104 User manual

PT-104 Data Logger

User's Guide

usbpt104.en r2

IPT-104 Data Logger User's Guide

Contents

....................................................................................................................................11 Introduction

........................................................................................................................................1

1 Overview

........................................................................................................................................2

2 Safety warnings

........................................................................................................................................3

3 Legal information

....................................................................................................................................42 Product information

........................................................................................................................................4

1 Pack contents

........................................................................................................................................5

2 Specifications

........................................................................................................................................6

3 Installing the driver

........................................................................................................................................6

4 Connection: USB port

........................................................................................................................................7

5 Connection: Ethernet port

........................................................................................................................................9

6 Connection: PRT inputs

........................................................................................................................................10

7 Setting up

........................................................................................................................................12

8 The back panel

....................................................................................................................................133 Background information

........................................................................................................................................13

1 Platinum resistance thermometers (PRTs)

....................................................................................................................................15

Index

PT-104 Data Logger User's Guide 1

1 Introduction

1.1 Overview

The PT-104 Data Logger is a four-channel, high-resolution temperature converter for

use with PT100 and PT1000 type platinum resistance thermometers (PRTs). It can be

used to measure temperature, resistance and voltage.

In PT100, PT1000 and resistance modes, the unit can use a two, three or four-wire

circuit. Four-wire measurement gives the greatest accuracy.

In voltage mode, the input connector can be treated as a differential input with

ground, or as two single-ended inputs.

Programmer's Guide

All the software that you need for everyday use of the PT-104 Data Logger is supplied

with the unit. For more advanced applications, you can write your own software.

Information on programming is published in a separate guide:

PT-104 Data Logger Programmer's Guide (usbpt104pg.en.pdf)

Introduction2

1.2 Safety warnings

We strongly recommend that you read the general safety information

below before using your product for the first time. If the equipment is not

used in the manner specified then the protection provided may be

impaired. This could result in damage to your computer and injury to

yourself and others.

DO NOT exceed the maximum input range. The PT-104 Data Logger is designed to

measure voltages in the range 0 to +2.5 V. Any voltages in excess of ±30 V may

cause permanent damage to the unit.

DO NOT use in contact with mains (line) voltages. This product is not designed

for use on circuits carrying mains voltages. Take great care when measuring

temperatures near mains (line-powered) equipment. If in doubt, use a meter to check

that there is no hazardous AC or DC voltage on the equipment. If a sensor is

accidentally connected to a mains voltage, you risk damage to the converter and your

computer, and your computer chassis may become live resulting in injury to yourself

and others.

DO NOT exceed the maximum input voltage range of the device. Incorrect

configuration or use of the device to measure voltages outside this range can be

hazardous.

DO NOT rely upon the product's ground connection as a protective safety

earth. If there is any possibility of contact with hazardous voltages, the equipment

under test must be safely earthed.

DO NOT attempt to repair the unit. The unit contains no user-serviceable parts.

Repair or calibration of the unit requires specialised test equipment and must be

performed by Pico Technology or its authorised distributors.

PT-104 Data Logger User's Guide 3

1.3 Legal information

The material contained in this release is licensed, not sold. Pico Technology grants a

licence to the person who installs this software, subject to the conditions listed below.

Access. The licensee agrees to allow access to this software only to persons who have

been informed of these conditions and agree to abide by them.

Usage. The software in this release is for use only with Pico products or with data

collected using Pico products.

all material (software, documents etc.) contained in this release. You may copy and

distribute the entire release in its original state, but must not copy individual items

within the release other than for backup purposes.

Liability. Pico Technology and its agents shall not be liable for any loss, damage or

injury, howsoever caused, related to the use of Pico Technology equipment or

software, unless excluded by statute.

Fitness for purpose. No two applications are the same: Pico Technology cannot

guarantee that its equipment or software is suitable for a given application. It is your

responsibility, therefore, to ensure that the product is suitable for your application.

Mission-critical applications. This software is intended for use on a computer that

may be running other software products. For this reason, one of the conditions of the

license is that it excludes usage in mission-critical applications, for example life

support systems.

Viruses. This software was continuously monitored for viruses during production.

However, you are responsible for virus-checking the software once it is installed.

Support. If you are dissatisfied with the performance of this software, please contact

our technical support staff, who will try to fix the problem within a reasonable time. If

you are still dissatisfied, please return the product and software to your supplier

within 14 days of purchase for a full refund.

Upgrades. We provide upgrades, free of charge, from our web site at

www.picotech.com. We reserve the right to charge for updates or replacements sent

out on physical media.

Trademarks. Pico Technology Limited, PicoScope and PicoLog, are trademarks of Pico

Technology, registered in the United Kingdom and other countries. Windows XP,

Windows Vista and Windows 7 are trademarks of Microsoft Corporation.

Product information4

2 Product information

2.1 Pack contents

Please check that your PT-104 pack (order code PP682) contains the following items:

Quantity

Reorder code

Description

PP682

PT-104 Data Logger

DO112

USB Installation Guide

MI106

USB lead

DI025

Software and Reference CD

TA076

Ethernet patch cable

PT-104 Data Logger User's Guide 5

2.2 Specifications

Temperature

Resistance

Voltage

Sensor

PT100*, PT1000

N/A

Range

-200 to +800 °C

0 to 375 *

0 to 10 kΩ

0 to 115 mV

0 to 2.5 V*

Linearity

20 ppm

Accuracy @25°C

0.01 °C*

20 ppm*

0.2% (0 to 2.5 V)

2% (0 to 115 mV)

Temperature

coefficient

5 ppm/°C

100 ppm/°C

RMS Noise

(using filter)

0.01 °C

10 ppm

Resolution

0.001 °C

1 µ

0.156 µV

Conversion Time

Per Channel

720 ms

Number of inputs

Connectors

4-pin mini-DIN

Input impedance

>> 1 M

Overvoltage

protection

±30 V

Output

USB or Ethernet

Power

USB 1.1: 5 V ±10% @ <100 mA

USB 2.0: 5 V ±10% @ <200 mA

Ethernet: 48 V ±20% @ <40 mA (< 2 W)

Temperature

range

20 °C to 30 °C for stated accuracy

0 °C to 70 °C operating

-20 to +80 °C storage

Humidity range

20% to 90% RH non-condensing, operating

5% to 95% RH non-condensing, storage

Dimensions

W 135 x L 184 x H 36 mm

(5.31 x 7.24 x 1.42 in)

Software

PicoLog data logging software.

Drivers for Windows XP SP3/Windows Vista/Windows 7/

Windows 8.

Examples for C/C++, Excel, LabVIEW.

Ethernet port

Conforms to IEEE 802.3 10Base-T.

Compatible with 10/100/1000Base-T networks.

Conforms to IEEE 802.3af Power-over-Ethernet (PoE).

USB port

Conforms to USB 2.0 Full-Speed (12 Mbps)

*Quoted accuracy is for options marked

Product information6

2.3 Installing the driver

The driver is installed automatically when you install the PicoLog software.

Alternatively, you can download the driver from our website at http://

www.picotech.com.

2.4 Connection: USB port

To use the PT-104 Data Logger, connect its USB port to a USB port on your computer

using the cable provided.

The first time you connect the device, Windows will install the driver and then tell you

that the device is ready for use. You can then run the PicoLog software to start making

measurements.

PT-104 Data Logger User's Guide 7

2.5 Connection: Ethernet port

Setup utility

Before connecting to the PT-104 Data Logger's Ethernet port, you must first configure

the Ethernet settings. Proceed as follows:

1. Connect the unit to your computer using the USB port.

2. Run the Ethernet Settings utility. There is a shortcut to this utility in the Pico

Technology program group under the Windows Start menu.

3. Set the Device Types control to "PT-104 (USB)".

4. The serial number of your device should appear in the device list. Click the device

once to select it.

5. Set the Enable Ethernet Settings check box.

6. Enter the IP address and port that you wish to give the device. You may need to

ask your network manager for an IP address that does not conflict with existing

devices on the network.

7. Click Save.

8. You can now either continue to use the PT-104 Data Logger as a USB device, or

unplug the USB cable and reconnect the device using its Ethernet port.

Product information8

Power-saving tip

If you wish to stop using the PT-104 Data Logger in Ethernet mode, you

can use the Ethernet Settings utility to disable its Ethernet port. This

reduces the power consumption of the device when used in USB mode.

Ethernet and USB

Do not use the PT-104 Data Logger in USB mode when it is being powered

by Power-over-Ethernet (PoE). This could cause the unit to radiate

electromagnetic energy outside the limits permitted by FCC and EU

regulations, and could also cause it to produce spurious measurements. It

will not, however, cause permanent damage to the unit.

LAN connection

To use the PT-104 Data Logger on a local-area network (LAN), connect it to your

network switch or network router using the Ethernet cable provided.

Direct connection

You can also connect the PT-104 Data Logger directly to the network port on your

computer. For this connection, you will need to use an Ethernet crossover cable (not

supplied).

Power over Ethernet (PoE)

The PT-104 Data Logger can obtain its power from the Ethernet port as a Powered

Device (PD) according to the PoE standard. To use this feature, you must connect the

unit to Power Sourcing Equipment (PSE) such as a network switch, router or power

injector that also supports the PoE standard. Any standard Ethernet cable up to 100 m

(about 328 ft) in length can be used.

PT-104 Data Logger User's Guide 9

2.6 Connection: PRT inputs

The PT-104 Data Logger is compatible with PT100 and PT1000 type platinum

resistance thermometers (PRTs). Connect each one of these devices to the unit as

follows.

Pin Connections to the PT-104 Data Logger Mini-DIN socket

PT100, PT1000

or Resistance

4-Wire

PT100, PT1000

or Resistance

3-Wire

PT100, PT1000

or Resistance

2-Wire

Differential voltage

White

Connect to pin 3

Do not connect

Red

V -

White

V +

Red

Connect to pin 2

Gnd

Single-ended voltage connection

Single-ended mode allows you to double the number of channels from 4 to 8. It is

supported by the driver, so you can use it in your own applications. It is not, however,

supported by the PicoLog software.

Connector

Channel

Note on Differential Voltage Mode

The maximum input voltage range of the PT-104 Data Logger is 2.5 V. Any voltage in

excess of ±30 V on any input pin may cause permanent damage to the unit.

In Differential Voltage Mode, the input connector should be treated as a differential

input with reference to ground. Both inputs (V+ and V-) must be zero volts or above

(it does not matter which input has the higher voltage) and must remain within the

input range. A ground reference connection is also required for correct operation. The

ground connection of each mini-DIN socket consists of a 100 resistor to mains

earth/ground through the USB cable outer braiding and the PC chassis.

Product information10

2.7 Setting up

Set up the PT-104 Data Logger as follows:

1. From the File menu in the PicoLog software Recorder, select New settings.

The Recording dialog box appears:

2. Click OK. The Sampling Rate dialog box appears:

3. Click OK. The Converter details dialog box appears.

4. From the Converter type drop-down list, select either PT-104 (USB) or PT-104

(Ethernet).The dialog box will then show the converter list, as in the following

examples:

PT-104 Data Logger User's Guide 11

5. USB connection: Select the device with the correct type and serial number, and

click OK.

Ethernet connection: Any PT-104 Data Logger devices visible to your

computer on your local network will appear in the list. Select the device with the

correct type and IP address, and click OK. If your device does not appear in the

list, type its IP address and port number in the boxes below the list.

When you click OK, the PT-104 Data Logger channels window will appear:

6. In the PT-104 Data Logger channels window, double-click on Ch1 unused.

The Edit PT-104 Data Logger Channel dialog box appears:

7. Type in a name for the channel, if required.

8. Select the data type required i.e temperature, resistance or voltage.

9. Select circuit - for PT100, PT1000 and Resistance data types only.

Product information12

10.Now click OK. Readings from the PT-104 Data Logger should appear in the monitor

window:

2.8 The back panel

A: Ethernet port

B: USB port

C: Ethernet Data indicator - Flashes to indicate Ethernet data transfer.

D: Ethernet Link indicator - On when Ethernet port connected to an active device.

E: Power/Status indicator - On when power is applied. Flashes to indicate conversion

in progress.

PT-104 Data Logger User's Guide 13

3 Background information

3.1 Platinum resistance thermometers (PRTs)

PRTs (Platinum Resistance Thermometers) offer excellent accuracy over a wide

temperature range (from -200 °C to 850 °C). Sensors are interchangeable between

different manufacturers, and are available in various accuracy ratings in packages to

suit most applications. Unlike thermocouples, it is not necessary to use special cables

to connect to the sensor.

The principle of operation is to measure the resistance of a platinum element. The

most common type (PT100) has a resistance of 100 at 0 °C and 138.4 at 100 °C.

The relationship between temperature and resistance is approximately linear over a

small temperature range. For example, if you assume that it is linear over the 0 °C to

100 °C range, the error at 50 °C is 0.4 °C. For precision measurement, it is necessary

to linearise the resistance to give an accurate temperature. The most recent definition

of the relationship between resistance and temperature is International Temperature

Standard 90 (ITS-90). This linearisation is done automatically with software.

The linearisation equation is:

Rt= R0(1 + A·t + B·t2+ C·(t-100)·t3)

A = 3.9083 x 10-3

B = -5.775 x 10-7

C = (below 0°C) -4.183 x 10-12

(above 0°C) 0

For a PT100 sensor, a 1 °C temperature change will cause a 0.384 change in

resistance, so even a small error in measurement of the resistance (for example, the

resistance of the wires leading to the sensor) can cause a large error in the

measurement of the temperature. For precision work, sensors have four wires - two to

carry the sense current, and two to measure the voltage across the sensor element. It

is also possible to obtain three-wire sensors, although these operate on the (not

necessarily valid) assumption that the resistance of each of the three wires is the

same.

The current through the sensor will cause some heating. For example, a sense current

of 245 µA through a 100 resistor generates 6 µW of heat. If the sensor element is

unable to dissipate this heat, it reports an artificially high temperature. This effect can

be reduced by either using a large sensor element, or by making sure that it is in good

thermal contact with its environment.

Using a 1 mA sense current gives a signal of only 100 mV. Because the change in

resistance for a degree Celsius is very small, even a small error in the measurement of

the voltage across the sensor produces a large error in the temperature measurement.

For example, a 100 µV voltage measurement error would give a 0.4 °C error in the

temperature reading. Similarly, a 1 µA error in the sense current would give a 0.4 °C

temperature error.

Background information14

Because of the low signal levels, it is important to keep any cables away from electric

cables, motors, switchgear and other devices that may emit electrical noise. Using

screened cable, with the screen grounded at one end, may help to reduce

interference. When using long cables, it is necessary to check that the measuring

equipment is capable of handling the resistance of the cables. Most equipment can

cope with up to 100 per core.

The type of probe and cable should be chosen carefully to suit the application. The

main issues are the temperature range and exposure to fluids (corrosive or

conductive) or metals. Clearly, normal solder junctions on cables should not be used

at temperatures above about 170 °C.

Sensor manufacturers offer a wide range of sensors that comply with BS1904 class B

(DIN 43760). These sensors offer an accuracy of ±0.3 °C at 0 °C. For increased

accuracy, you can use BS1904 class A (±0.15 °C) or tenth-DIN sensors (±0.03 °C).

Companies like Isotech can provide standards with 0.001 °C accuracy. Please note

that these accuracy specifications relate to the SENSOR ONLY. It is necessary to add

on any error in the measuring system as well.

Related standards are IEC751 and JISC1604-1989. IEC751 also defines the colour

coding for PRT sensor cables: the one or two wires attached to one end of the sensor

are red, and the one or two wires at the other end are white.

PT-104 Data Logger User's Guide 15

Index

Access 3

Accuracy 5

Back panel 12

Connection

Ethernet 7

PRTs 9

USB 6

Connectors 5

Conversion time 5

Dimensions 5

Environmental conditions 5

Ethernet

connection 7

indicators 12

port 12

Fitness for purpose 3

Indicators 12

Inputs

impedance 5

number of 5

Installation 6

LAN connection 7

Legal information 3

Liability 3

Linearity 5

Mains voltages 2

Maximum input range 2

Mission-critical applications 3

Noise, RMS 5

Output 5

Overview 1

Overvoltage protection 5

Pack contents 4

Power indicator 12

Power-over-Ethernet (PoE) 7

PRT

background information 13

connection 9

Range 5

Repairs 2

Resolution 5

Safety warnings 2

Sensor 5

Setting up 10

Software 5

Specifications 5

Status indicator 12

Support 3

Temperature coefficient 5

Trademarks 3

Upgrades 3

Usage 3

USB

connection 6

port 12

Index16

Viruses 3

Table of contents

Other pico Technology Data Logger manuals

pico Technology

pico Technology USB DrDAQ User manual

pico Technology

pico Technology ADC-20 User manual

pico Technology

pico Technology PicoLog Reference guide

pico Technology

pico Technology PicoLog CM3 User manual

Popular Data Logger manuals by other brands

Relay

Relay WebLog120 Hardware user manual

Marathon

Marathon microDL quick start guide

berlinger

berlinger Q-tag CLm doc user manual

ABB

ABB VSN700 product manual

greenTEG

greenTEG gSKIN U-Value Kit instruction manual

Comet

Comet U0111 Quick start manual

ImmersionRC

ImmersionRC LapRF Operator's manual

globalwater

globalwater PL200G manual

G-Tek

G-Tek LMPro T051 quick start guide

Tzone

Tzone TT18 quick start guide

Delta OHM

Delta OHM HD2013-DB manual

Delta OHM

Delta OHM HD32.7 manual

Tzone

Tzone TZ-BT06 user manual

Global Sat

Global Sat DG-100 user manual

ETM

ETM DeltaBlue quick start guide

Jäger

Jäger ADwin-Gold II manual

Telemotive AG

Telemotive AG blue PiraT2 user guide

Racelogic

Racelogic VBOX Touch quick start guide

pico Technology PT-104 User manual

Popular Data Logger manuals by other brands