Time Electronics 7007 Loop-Mate 2 User manual

User Manual
7007 Loop-Mate 2
Loop Signal Indicator
Version 1.1
August 2021
Time Electronics Ltd
Unit 5, TON Business Park, 2-8 Morley Road,
Tonbridge, Kent, TN9 1RA, United Kingdom.
T: [phone] | F: [phone]
[e-mail] | www.timeelectronics.com

© 2021 Time Electronics Ltd.
All rights reserved.
Nothing from this manual may be multiplied, or made public in any form or manner, either
electronically or hard copy, without prior written consent from Time Electronics Ltd.
This also applies to any schematics, drawings and diagrams contained herein.
This manual provides operating and safety instructions for the Time Electronics product.
To ensure correct operation and safety, please follow the instructions in this manual.
Time Electronics reserves the right to change the contents, specifications and other
information contained in this manual without notice.

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Contents
1Introduction....................................................................................................................................4
1.1 Features ................................................................................................................................................ 4
1.2 Description.............................................................................................................................................5
1.3 Specifications ........................................................................................................................................6
2Front panel controls......................................................................................................................7
3Operation........................................................................................................................................8
3.1 Function Select......................................................................................................................................8
3.2 Display Select........................................................................................................................................8
3.3 Description of typical process loop components....................................................................................8
3.4 Rx Sim function ...................................................................................................................................10
3.5 Tx Test function...................................................................................................................................11
3.6 Meas Volt DC function.........................................................................................................................12
4Power supply ...............................................................................................................................13
4.1 Battery life............................................................................................................................................ 13
4.2 Battery replacement ............................................................................................................................ 13
5Maintenance................................................................................................................................. 14
5.1 Calibration ...........................................................................................................................................14
5.2 Adjustment of Calibration .................................................................................................................... 18
6Warranty and Servicing............................................................................................................... 24

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1Introduction
1.1 Features
•4 - 20 mA, 0 -10 V, 0 - 50 V ranges
•LCD 4 digit display, mA, V, % of range
•Accuracy 0.05 %
•RxSim, TxTest, or 50 mA / 50 V modes
•Internal loop supply, 25 mA max
•Battery powered 9 V PP3
•Supplied with carry case and test leads

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1.2 Description
The 7007 LoopMate 2 is a dedicated loop signal indicator (RxSim) with an in-built 24 V loop
drive supply (TxTest). The operator can select the loop type, and also the type of units,
either direct (mA) or % of span display. The loop signal is shown on an easy-to-read LCD
display to an accuracy of 0.05% either in mA, V, or % of span.
It is a cost-effective process instrument suitable for service and maintenance engineers. It
combines simple operation with the accuracy required for most process applications. Used in
conjunction with the 7006 LoopMate 1 they provide full process loop testing capabilities,
facilitating quick location of faults, testing and re-calibration.
In addition to TxTest (transmitter test) and RxSim (receiver simulation) the 7007 can be used
to measure DC voltage in the process loop up to 50 V.
The unit is powered by a PP3 type battery. Rechargeable batteries can be used if required.
It comes complete with carrying pouch, leads and user manual.

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1.3 Specifications
Functions RxSim, TxTest, Meas Volt DC.
Ranges
RxSim:0 to 50 mA or 0% to 100% (4-20mA).
TxTest (RxSim plus internal 24V DC loop drive): 0 to 25 mA or 0% to 100% (4-20mA).
Meas Volt DC: 0 to 50 V DC or 0% to 100% (0 to 10 V).
Accuracy
0.05% of Span (% of span)
0.05% of Range (mA/V).
Indication 4.5 digit LCD display
Connections Two 4 mm recessed sockets
Power PP3 battery
Case Material ABS plastic
Carrying Pouch Leatherette material. Includes compartment for leads and spare battery.
Leads 4mm gold plated connectors.
Temperature Co-efficient The unit stays in specification over operating temperature range.
Operating Temperature 0 to 50 °C.
Storage Temperature -30 to 70 °C.
Operating Humidity 10 to 90% non-condensing, 25 °C.
Dimensions H 140 x W 65 x D 27 mm (6.0 ×2.5 ×1.0 in).
Weight 200 grams (7 oz).
Options
C145: Traceable calibration certificate (Factory).
C144: Accredited calibration certificate (ISO 17025).
7006: Loop-Mate 1: Loop Simulator (separate product).

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2Front panel controls
Connection Terminals
Display Switch
LCD Display
Function Switch

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3Operation
3.1 Function Select
The Loop-Mate 2 has 3 functions:
1. Function 1 ..................Rx SIM
2. Function 2 ..................Tx TEST
3. Function 3 ..................Meas Volt DC
These are selected using the function select switch.
3.2 Display Select
For RxSim and TxTest the signal can be displayed either direct (mA) or % of span.
These are selected using the display select switch, which also turns off the Loop-Mate 2.
3.3 Description of typical process loop components
4 - 20 mA process loop
0 - 10 V process loop
4-20 mA Process loop
and
4 - 20 mA Control loop.
This can be used for
closed loop control.

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Tx (transmitter):
This component converts physical signals such as pressure, temperature, flow, and level
etc, into the loop signals (4 - 20 mA or 0 - 10 V).
Rx (receiver):
This component measures the loop signal and either displays it (indicator) or converts it to
another form e.g. digital output for control purposes, (controller).
Process Controllers:
This device usually contains both Rx (signal loop) and Tx (control loop) components, which
operate in separate loops. The Rx and Tx can be either 4 - 20 mA or 0 - 10 V.
Loop excitation supply:
A DC power supply (nominally 24 V) that drives the loop.

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3.4 Rx Sim function
The unit displays the loop current in either mA (0-50 mA) or percentage of span (4-20 mA),
depending on the position of the display select switch.
3.4.1 Operation
1. Connect the unit to the process loop observing the correct polarity.
2. Set the function switch to RxSim.
3. Turn the unit on, selecting the desired display units, using the display switch.
Note: If the loop current is less than 4 mA, negative % of span will be displayed.
See table below.
3.4.2 Connection
excitation
supply
Loop
RxSim
+ve
-ve
Loop-Mate2
Tx
(Transmitter)
4-20mA
Loop Current (mA)
Display Reading
Open Circuit -25.00
1 -18.75
2
-12.50
3
- 06.25
4
00.00

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3.5 Tx Test function
With TxTest selected, a loop excitation drive supply (24v) is internally generated.
The display will show the loop current as either mA (0-50 mA) or percentage of span
(4-20 mA), depending on the position of the display select switch.
3.5.1 Operation
1. Connect the unit to the process loop observing the correct polarity.
2. Set the function switch to TxTest.
3. Turn the unit on, selecting the desired display units, using the display switch.
Note: If the loop current is less than 4 mA, negative % of span will be displayed.
See table below.
3.5.2 Connection
TxTest
+ve
-ve
Loop-Mate2
Tx
(Transmitter)
4-20mA
Loop Current (mA) Display Reading
Open Circuit -25.00
1 -18.75
2 -12.50
3 - 06.25
4
00.00

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3.6 Meas Volt DC function
When the unit is set to Meas Volt DC it displays the voltage either as Volts (0 - 50 V) or
percentage of span (0 – 10V), depending on the position of the display select switch.
3.6.1 Operation
1. Connect the unit to the process loop observing the correct polarity.
2. Set the function switch to Meas Volt DC.
3. Turn the unit on, selecting the desired display units, using the display switch.
3.6.2 Connection
Meas Volts DC
Loop-Mate2
+ve
-ve
Tx
(Transmitter)
0-10v
Note: The unit can be used to measure DC voltages up to a maximum of 50V DC.

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4Power supply
4.1 Battery life
A single PP3 battery powers the unit. Types that can be used are Zinc Carbon (250mAh),
Alkaline (450mAh), Lithium (1200mAh) and rechargeable (150mAh). For best performance
Lithium batteries are recommended. Under typical usage an Alkaline (450mA) battery will
last for approximately 14 - 16 hours of continuous operation. Assuming the Loop-Mate2 is
used for approximately 3 hours per day the batteries will last for a week or more. Continuous
operation on the TxTest function will shorten the battery life. The unit will display ‘low battery’
when the battery voltage is too low. At this point replacement of the battery is necessary. It is
recommended that a spare battery be always carried in the compartment provided in the
carrying pouch.
4.2 Battery replacement
Slide off the back cover of the case and remove the battery from its compartment. Unclip the
battery and replace it with a new PP3 as shown below. Then slide the battery cover back
into place.

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5Maintenance
5.1 Calibration
5.1.1 Calibration equipment required
Precision DC current source (Time Electronics 1024 for example).
Precision DC voltage source (Time Electronics 5025 for example).
Multimeter (DMM) with accuracy of 0.02% or better. Examples of suitable instruments are
Time Electronics 5075 or HP 34401A.
Calibration should be performed at 23 °C ±5 °C.
5.1.2 Calibration of Rx Sim
Direct reading (mA)
1. Connect the precision dc current source to the input terminals of the Loop-Mate 2.
2. Set the Function switch to RxSim.
3. Set the Display switch to mA/V.
4. Set the output of the DC current source to those shown (mA input to Loop-Mate 2) in
the table below and check the display reading is between the Min and Max values.
Allowed error specification:
mA Input Min value (mA) Max value (mA)
10 9.975 10.025
20 19.975 20.025
30 29.975 30.025
40 39.975 40.025
50 49.975 50.025

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Percentage of Span
1. With the Loop-Mate 2 open circuit, set the Function switch to RxSim.
2. Set the Display switch to % of span.
3. The display should read –25.00 ± 0.01.
4. Switch off the unit.
5. Connect the precision dc current source to the input terminals of the Loop-Mate2.
6. Set the Function switch to RxSim.
7. Set the Display switch to % of span.
8. Set the output of the DC current source to those shown (mA input to Loop-Mate2) in
the table below and check the display reading is between the Min and Max values.
Allowed error specification:
% of span mA input Min value (%) Max value (%)
0 4 -0.05 0.05
25 8 24.95 25.05
50 12 49.95 50.05
75 16 74.95 75.05
100 20 99.95 100.05
If the reading on the Loop-Mate 2 display is out of specification then adjustment of the
calibration will be required (see later in this section).

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5.1.3 Calibration of Meas Volt DC
Direct reading (V)
1. Connect the precision dc voltage source to the input terminals of the Loop-Mate 2.
2. Set the Function switch to Meas Volt DC.
3. Set the Display switch to mA/V.
4. Set the output of the dc voltage source to those shown (Volts input to Loop-Mate 2)
in table below, and check the display reading is between the Min and Max values.
Allowed error specification:
Volts input Min value (V) Max value (V)
0 -0.025 0.025
10 9.975 10.025
20 19.975 20.025
30 29.975 30.025
40 39.975 40.025
50 49.975 50.025

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Percentage of Span
1. Connect the precision dc voltage source to the input terminals of the Loop-Mate2.
2. Set the Function switch to Meas Volt DC.
3. Set the Display switch to % of span.
4. Turn on the Loop-Mate 2.
5. Set the output of the dc voltage source to those shown (Volts input to Loop-Mate 2)
in table below, and check the display reading is between the Min and Max values.
Allowed error specification:
% of span Volts input Min value (%) Max value (%)
0 0 -0.05 0.05
25 2.50 24.95 25.05
50 5.00 49.95 50.05
75 7.50 74.95 75.05
100 10.00 99.95 100.05
If the reading on the Loop-Mate 2 display is out of specification then adjustment of the
calibration will be required (see later in this section).

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5.2 Adjustment of Calibration
When Loop-Mate2is found to be out of specification the procedures described in the
following sections can be followed to adjust and calibrate instrument.
5.2.1 Disassembling Loop-Mate 2
1. First remove the battery compartment cover and disconnect the battery, as shown in
section 4.2 of this manual.
2. Remove the 4 screws from the back of the case.
3. Position the Loop-Mate 2 so that the front panel is facing upwards.
4. Carefully lift the case lid.
5. Then reconnect the battery.

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5.2.2 Trimmer Locations (used for adjusting the calibration)

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5.2.3 Reference voltage check and adjustment
1. Set the function switch to RxSIM
2. Set the Display switch to mA/V.
3. Select the voltage scale on the DMM
Connect a test lead from the DMM negative input to the Loop-Mate 2 minus (-)
terminal.
4. Connect a test lead with a pointed probe to the DMM positive input.
5. Place the pointed probe on the pad near to VR3 as shown in the picture, thus making
contact with VR3`s middle pin. The reading should be 1 V.
6. Adjust VR3 until 1 V is displayed on the DMM.