MREL HANDITRAP II User manual

Operations Manual
Edition 4.0
MREL GROUP OF COMPANIES LIMITED
5-779 Sir John A MacDonald Blvd. Kingston, Ontario K7L 1H3 Canada
T: [phone] E: [email protected] www.mrel.com

HandiTrap II™ Operations Manual - Edition 4.0
II
Copyright Information
MREL Group of Companies Limited (MREL) warrants that the product is free from Manufacturer’s defects for a period of one (1) year from
the date of shipment to the Customer. This Warranty covers all parts and labour.
MREL does not warrant that the product will meet the Customer’s requirements, or that it will operate in the combinations which may be
selected by the Customer.
MREL does not and cannot warrant the performance or results that may be obtained by using the product. Accordingly, the product and its
documentation are sold “as is” without warranty as to their performance, merchantability or fitness for any particular purpose. The Customer
assumes the entire risk as to the results and performance of the product.
MREL is committed to product innovation; accordingly product may undergo specification improvements without notice. Copyright © 2022
MREL Group of Companies Limited. HandiTrap II™ VOD Recorder, HandiTrap II™ VOD Recorder Logo, and MREL Logo are trademarks
or registered trademarks of MREL Group of Companies Limited. Windows®is a registered trademark of Microsoft Corporation.
© Copyright 2022, MREL Group of Companies Limited. This Operations Manual supersedes any earlier editions. All Rights Reserved.
Reproduction or adaptation of any part of this documentation or Software without written permission of the Copyright owner is unlawful.
Publication History
Edition 4.0, March 2014
This version of the Manual
Edition 3.0, May 2012
Edition 2.2, March 2009
Edition 2.1, January 2009

III
Table of Contents
Chapter 1: Getting Started 1
1.1 Ensuring That All Hardware Has Been Received 2
1.2 Installing the DAS™ Data Acquisition Suite Software 2
Chapter 2: Introduction 3
2.1 Background 4
2.2 Safety Considerations 4
2.3 Applications for the HandiTrap II™ VOD Recorder 5
2.3.1 The main applications when testing explosive samples 5
2.3.2 The main applications when testing explosives in a blasthole 5
Chapter 3: Handitrap II™ VOD Recorder Hardware 7
3.1 Hardware Components 8
3.1.1 HandiTrap II™ VOD Recorder 8
3.1.2 Battery Charger 10
3.1.3 HandiTrap II™ VOD Recorder USB Cable 11
3.1.4 BNC Adapter 11
3.1.5 External Trigger Adapter 11
3.2 HandiTrap II™ VOD Recorder Internal Rechargeable Battery 11
3.3 Recharing the HandiTrap II™ VOD Recorder 12
3.4 Long Term Storage Considerations 12
3.5 VOD Resistance Probes Used by the HandiTrap II™ VOD Recorder 12
3.5.1 VOD PROBEROD 12
3.5.2 VOD PROBECABLE-HT 13
3.6 RG-58/U Coaxial Cable and Portable Cable Reel 13
3.6.1 Light-Duty Cable Reel 13
3.6.2 Heavy-Duty Cable Reel 13
3.7 HandiTrap II™ VOD Recorder Techincal Specifications 14
Chapter 4: Recording VODs and Deck Delays 15
4.1 Safety Considerations for Selecting an Explosive Testing Site 16
4.2 The Resistance Wire Technique for Measuring VOD 17
4.3 Installing the VOD PROBEROD for testing a Sample of Explosives 17
4.4 Installing VOD PROBECABLE-HT for Testing Explosives in a Blasthole 19
4.4.1 Preparation of VOD PROBECABLE-HT for a single Blasthole 21
4.5 Coaxial Cable Protection 22
4.6 HandiTrap II™ VOD Recorder Setup Procedure for VOD Measurement 22
4.7 VOD PROBEROD or VOD PROBECABLE-HT Circuit Resistance 23
4.8 Utilizing the External Trigger 24
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Chapter 5: The DAS™ Data Acquisition Suite Software for Windows® 25
5.1 Retrieving Data From The HandiTrap II™ VOD Recorder 26
5.2 Selecting Data Files for Analysis 26
5.3 Introduction To Analysis 26
Chapter 6: Battery Maintenance 27
7.1 Monitoring the Battery 28
7.2 Discharge/Recharge Cycle 28
7.3 When to Replace the Battery 29
7.3.1 Maintenance Schedule for Battery 29
7.3.2 Alternate Maintenance Schedule for Battery 29
7.3.3 Estimating Battery Run Time 30
7.3.4 Charging Time 30
7.3.5 Charing for a Precise Amount of Time 30
7.3.6 Using Timed Charging with the HandiTrap II™ VOD Recorder 30
Chapter 8: Contacting MREL for Technical Support 31
8.1 Contacting MREL 32

1
Chapter 1
Getting Started
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1.1 Ensuring That All HandiTrap II™ VOD Recorder Hardware
Has Been Received
1.2 Installing the DAS™ Data Acquisition Suite Software
All of the steps detailed in this Chapter should be completed before the Operator goes into the field to conduct a VOD test:
1. Ensure that all HandiTrap II™ VOD Recorder components have been received and are available.
2. Install the HandiTrap II™ VOD Recorder Software on the Operator’s computer.
3. Ensure that the Operator’s computer and HandiTrap II™ VOD Recorder are able to communicate with each other (Section 1.3).
Details of these hardware components are contained in Chapter 3.
1. HandiTrap II™ VOD Recorder.
2. HandiTrap II™ VOD Recorder Battery Charger that is labeled 120 VAC or 230 VAC depending on your Country’s mains power.
3. Communications Cable – USB cable.
4. BNC Adapter.
5. External Trigger Adapter.
6. DAS™ Data Acquisition Suite Software on USB.
7. HandiTrap II™ VOD Recorder Operations Manual.
8. (Optional) VOD resistance probes: VOD PROBERODs or VOD PROBECABLE-HT.
9. (Optional) Coaxial Cable on cable reel.
Refer to the DAS™ Data Acquisition Suite Software manual for installation procedures.
This Chapter provides a quick start guide to the HandiTrap II™ VOD Recorder.
Overview

3
Chapter 2
Introduction
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The HandiTrap II™ VOD Recorder is a portable, 1 channel, high resolution, explosives continuous VOD recorder that has proven its
reliability under the extreme temperature, weather, dust and rugged conditions that characterize blasting environments around the world.
The HandiTrap II™ VOD Recorder is also the simplest and most affordable high-resolution recorder available for testing either samples of
explosives, or explosives in a blasthole.
The DAS™ Data Acquisition Suite Software allows the User to analyze VOD traces recorded by the HandiTrap II™ VOD Recorder . This
software is used to retrieve, display, analyze, print and export VOD data.
The HandiTrap II™ VOD Recorder is an easy and safe instrument to operate. However, one should be aware of the inherent risk
associated with explosive’s handling and familiar with working in blasting environments. For this reason, it is always recommended that
knowledgeable personnel, experienced in handling explosives and familiar with blasting procedures operate the
HandiTrap II™ VOD Recorder when testing explosives. The standard rules of safety used with explosives should apply when monitoring
VODs or other explosive parameters.
When recording VODs, the HandiTrap II™ VOD Recorder outputs a low voltage (less than 5 VDC) and an extremely low current (less than
50 mA) to the VOD PROBEROD or VOD PROBECABLE-HT within the explosives from the VOD PROBEROD/VOD PROBECABLE-HT
connector on the HandiTrap II™ VOD Recorder. This low excitation signal ensures that the HandiTrap II™ VOD Recorder will not and can
not prematurely initiate explosives and/or detonators.
Standard (and common sense) rules apply when it comes to the presence of electrical storms near the testing area. Due to the inherent
hazards associated with blasting during these storms, in addition to the possibility of electrical interference causing false trigger signals to
the HandiTrap II™ VOD Recorder, it is recommended to immediately suspend all blasting activities and evacuate the area. This is standard
policy at most blasting operations.
2.1 Background
2.2 Safety Considerations
STOP
Persons not trained and/or authorized to handle explosives should not attempt to utilise the
HandiTrap II™ VOD Recorder for monitoring explosive properties.
This Chapter provides an introduction to the HandiTrap II™ VOD Recorder.
Overview

5
2.3.1 The main applications of the HandiTrap II™ VOD Recorder when testing explosive
samples include:
•Test the performance of explosives against the quality control standards set by the manufacturers.
•Measure the continuous VOD in any charge under confined or unconfined conditions.
•Determine the critical diameter and critical density of an explosive charge.
•Determine the gap sensitivity of explosives.
•Measure the timing accuracy of detonators.
•Measure the continuous VOD of primers/boosters.
•Determine the minimum booster size for any explosive by measuring run-up velocities.
2.3.2 The main applications of the HandiTrap II™ when testing explosives in a blasthole
include:
•Measure the continuous VOD hole diameter that is wet or dry and in any type of rock.
•Determine whether full detonation, low order detonation or failure occurred and where in the explosive column it happened.
•Check VODs against manufacturers’ specifications in full scale blasting environments.
•Determine the minimum booster size for any explosive by measuring run-up velocities in full scale blasting environments.
•Measure the timing accuracy of detonators in a decked hole in full scale blasting environments.
•Measure the effects of water, drill cuttings, rocks, etc. trapped within the explosive mass.
•Determine the length of explosive column to use in decking operations to evaluate the effect of stemming and drill cutting dilution,
water pick-up, etc. on the explosive run-up requirements.
•Determine the correct length and type of stemming material to be used between decks of explosives to prevent sympathetic
detonation or explosive desensitization from occurring.
•Using multiple HandiTrap II™ VOD Recorder’s, determine the delay time between blastholes.
Contact MREL for information on other MREL VOD recorders that are able to test the VOD of explosives in multiple blastholes and
determine the delay time between holes.
2.3 Applications for the HandiTrap II™ VOD Recorder
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7
Chapter 3
HandiTrap II™ VOD
Recorder Hardware
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The hardware components of the HandiTrap II™ VOD Recorder System include the HandiTrap II™ VOD Recorder, a Battery Charger, a
Communications Cable, BNC Adapter and an External Trigger Adapter. Also included with the HandiTrap II™ VOD Recorder System are
the Operations Manual and the DAS™ Data Acquisition Suite Software. A brief description of each of the hardware components is in the
following Sections.
3.1.1 HandiTrap II™ VOD Recorder
The HandiTrap II™ VOD Recorder contains electronic circuitry and an internal rechargeable battery within a protective steel case
measuring approximately 12 x 6.5 x 4 cm (4.75 x 2.5 x 1.5 in.) and weighing 0.3 kg (0.7 lbs.). The protective steel case prevents
damage from water, sand, snow, dust and similar harsh weather conditions. As well, the case offers resistance to high temperatures,
shocks and vibrations. The front of the HandiTrap II™ VOD Recorder is shown to the right.
3.1 Hardware Components
IMPORTANT
When the External Trigger Adapter is connected to the port, the HandiTrap II™ VOD Recoder will
only trigger with the trigger wire breaks.
This Chapter describes all of the hardware components provided with the HandiTrap II™ VOD
Recorder.
Overview
Probe Connection
BNC Adapter
LOW BAT. Battery Level
Indicator Light
TEST Button
Start Indicator Light
START Button
EXT. TRIG and COM/CHARGE
Connector

9
Function Description Visual Representation
Power The TEST and START buttons pressed simultaneously
for one second are used to turn the
HandiTrap II™ VOD Recorder ON and OFF.
When the HandiTrap II™ VOD Recorder
is ON, the START indicator light flashes
indicating that the HandiTrap II™ VOD
Recorder is in Active mode.
Battery Level The LOW BAT. indicator light flashes when the HandiTrap II™ VOD
Recorder internal batteries need recharging.
Probe Connection
and Testing
Probes
PROBEROD/PROBECABLE-HT: BNC connector for
connecting RG-58/U Coaxial Cable between the
VOD PROBEROD resistance probe or
VOD PROBECABLE-HT resistance wire and
the HandiTrap II™ VOD Recorder.
If the TEST button is pressed when a VOD
PROBEROD or VOD PROBECABLE-HT is connected to
the HandiTrap II™ VOD Recorder, a steady TEST
indicator light indicates that the electrical circuit of
the PROBEROD or PROBECABLE-HT is OK.
VOD PROBEROD
or VOD
PROBECABLE-HT
resistance too
low
With the TEST button pressed and if the light flashes slowly, the resistance
in the VOD PROBEROD or VOD PROBECABLE-HT is too low (such as a
short circuit).
The main features on the front panel of the HandiTrap II™ VOD Recorder are outlined below:
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The COM/CHARGE and EXT. TRIG. port is a multi-purpose port. It is used to connect the Communications Cable to the HandiTrap II™ VOD
Recorder. The other end of the Communications Cable is connected to the computer for retrieval of the recorded data (Chapter 5.1). The
COM/CHARGE port is also used to connect the Battery Charger to the HandiTrap II™ VOD Recorder. The COM/CHARGE port double
as an EXT. TRIG. (External Trigger) port that is used to connect the External Trigger Adapter to a normally closed trigger wire. When the
External Trigger Adapter is connected to the port, the HandiTrap II™ VOD Recorder will only trigger when the trigger wire breaks. If
using the external trigger option, it is important to connect the External Trigger Adapter to the
HandiTrap II™ VOD Recorder before pressing START or immediate triggering will occur when
making the connection.
3.1.2 Battery Charger
Please note that the Battery Charger has a specification printed on it, regarding whether it is
designed for 120 VAC or 230 VAC mains power.
Function Description Visual Representation
VOD PROBEROD
or VOD
PROBECABLE-HT
resistance too
high
With the TEST button pressed and if the light flashes quickly, the resistance
in the VOD PROBEROD or VOD PROBECABLE-HT is too high (such as an
open circuit).
Begin Monitoring If a VOD PROBEROD or VOD PROBECABLE-HT is connected to the
HandiTrap II™ VOD Recorder and the circuit is testing OK, pressing the
START button turns the START indicator light on and puts the
HandiTrap II™ VOD Recorder in Monitoring mode - waiting to record the
blast.
After the blast, the START indicator light will be flashing indicating that
there is VOD data ready to download to a computer.
Light steady
Light blinking slowly
Light blinking fast

11
The HandiTrap II™ VOD Recorder has an internal NiCd rechargeable battery pack. The HandiTrap II™ VOD Recorder is supplied with an
approved 120 VAC or approved 230 VAC Battery Charger, depending on the country of use. When the internal battery is fully charged,
the HandiTrap II™ VOD Recorder can operate for 8 hours (at maximum HandiTrap II™ VOD Recorder power consumption) before battery
recharging is required. The HandiTrap II™ VOD Recorder is shipped from MREL fully charged. Since some time may elapse before the
HandiTrap II™ VOD Recorder is actually put to use, the HandiTrap II™ VOD Recorder may not be charged fully the first time it is used. Full
operating time will be obtained when the HandiTrap II™ VOD Recorder is recharged. Normal charging time for the batteries is 14 to 16
hours. Leaving the HandiTrap II™ VOD Recorder connected to the charger for longer periods than this can reduce the “charge lifetime” of
the batteries (the number of full charges it can take). It is helpful to completely discharge and recharge the batteries every 1 to 3 months..
When doing this, recharge the batteries immediately after they have been discharged.
3.2 HandiTrap II™ VOD Recorder Internal Rechargeable
Battery
3.1.4 BNC Adapter
The BNC Adapter is provided to facilitate easy connection between the
VOD PROBEROD/VOD PROBECABLE-HT connector on the HandiTrap II™ VOD
Recorder to the coaxial cable (preferably RG-58/U) leading to the VOD PROBEROD
or VOD PROBECABLE-HT.
3.1.5 External Trigger Adapter
The External Trigger Adapter is provided to facilitate easy connection
between the EXT. TRIG. connector on the HandiTrap II™ VOD Recorder
to an external normally closed trigger wire. When the External Trigger
Adapter is connected to the port, the HANDITRAP II™ VOD RECORDER
WILL ONLY TRIGGER WHEN THE TRIGGER WIRE BREAKS.
STOP
Contact MREL if the Battery Charger that has been
supplied is incorrect for the mains voltage in your country.
3.1.3 HandiTrap II™ VOD Recorder USB Cable
This USB cable has been designed to download data from the HandiTrap II™ VOD Recorder. The
drivers can be found on the HandiTrap II™ VOD Recorder Installation disk.
IMPORTANT
Do not operate the HandiTrap II™ VOD Recorder when the charger is connected.
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3.4 Long Term Storage Considerations
3.5 VOD Resistance Probes Used by the HandiTrap II™ VOD Recorder
No special procedures, other than those pertaining to the internal batteries, should be taken for long term storage of the HandiTrap II™
VOD Recorder. In the eventuality that the HandiTrap II™ VOD Recorder remains idle for long periods, it is recommended to recharge the
HandiTrap II™ VOD Recorder once per month per the procedure in Section 3.3. This will maintain the conditioning of the internal
batteries. If the batteries lose their ability to hold a charge, discharge them completely, then recharge them for 14-16 hours
The following types of VOD resistance probes are available from MREL and are uniquely suitable for use with the HandiTrap II™ VOD
Recorder:
3.5.1 VOD PROBEROD
The VOD PROBEROD, shown below, is a rigid probe consisting of a high resistance insulated wire placed within a small diameter metal
tube, which acts as the return lead of the circuit. VOD PROBERODs are specifically designed to measure VODs of explosive cartridges
and/or of short sample tubes of explosives, under confined or unconfined conditions. They are available from MREL in a standard length
of 1 m(3.3 ft.) and are supplied with two leads, ready to be connected to the inner and outer leads of the RG-58 coaxial cable. The other
end of the RG-58 Coaxial cable is fitted with a BNC connector for attachment to the VOD PROBEROD-VOD PROBECABLE-HT connector
on the HandiTrap II™ VOD Recorder . Contact MREL for additional VOD PROBEROD or VOD PROBECABLE-HT information and ordering
details.
CAUTION
The HandiTrap II™ VOD Recorder internal battery can not be overcharged.
According to the battery Manufacturer’s specifications, full battery pack
recharging will take 14 to 16 hours. Charging for extended periods of
time can lower the lifetime of batteries, but not damage the HandiTrap II™
VOD Recorder in any way.
Connecting the Battery Charger
cable to the HandiTrap II™ VOD
Recorder
The procedure to recharge the HandiTrap II™ VOD Recorder is as follows:
1. With the HandiTrap II™ VOD Recorder switched OFF, connect the Battery
Charger between the COM/CHARGE port on the HandiTrap II™ VOD Recorder
and the wall outlet.
2. Full recharging is obtained after 14 to 16 hours of charging.
3. Unplug the Battery Charger from the wall outlet and then from the
HandiTrap II™ VOD Recorder.
3.3 Recharging the HandiTrap II™
VOD Recorder

13
3.6.1 Light-Duty Cable Reel
MREL Product # 1-06-01
As an optional accessory, MREL offers a portable cable reel with
101 m (333 ft.) of RG-58/U coaxial cable to connect between the
VOD PROBEROD or VOD PROBECABLE-HT and the PROBEROD/
PROBECABLE-HT connector on the HandiTrap II™ VOD Recorder. The
coaxial cable has the correct BNC connector installed for connecting
to the HandiTrap II™ VOD Recorder.
3.6.2 Heavy-Duty Cable Reel
MREL Product # 1-06-02
As an optional accessory, MREL offers a portable cable reel with
305 m (1000 ft.) of RG-58/U coaxial cable to connect between
the VOD PROBEROD or VOD PROBECABLE-HT and the PROBEROD/
PROBECABLE-HT connector on the HandiTrap II™ VOD Recorder.
The coaxial cable has the correct BNC connector installed for
connecting to the HandiTrap II™ VOD Recorder.
3.6 RG-58/U Coaxial Cable and Portable Cable Reel
3.5.2 VOD PROBECABLE-HT
A spool of VOD PROBECABLE-HT is shown. VOD PROBECABLE-HT is a flexible
resistance wire consisting of a high resistance wire as a solid centre conductor
insulated from braided shielding which acts as the return lead of the circuit. VOD
PROBECABLE-HT is specifically designed to measure VODs of explosives loaded
into a blasthole and to determine the delay time between explosives decks in a
blasthole. VOD PROBECABLE-HT is available from MREL in a standard length of
100 ft. (30 m) per spool and is supplied with one end prepared for lowering into
the blasthole and the other end ready to be connected to the RG-58/U coaxial
cable, which in turn connects to the VOD PROBEROD/VOD PROBECABLE-HT
connector on the HandiTrap II™ VOD Recorder. Contact MREL for additional
PROBECABLE-HT information and ordering details.
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3.7 HandiTrap II™ VOD Recorder Technical Specifications
Number of Channels 1 channel for VOD.
Vertical Resolution 12 bits, 1 part in 4,096.
Recording Rate 1 MHz
Total Recording Time 131 milliseconds (131,072 data points).
Pre-Trigger Time 32.8 milliseconds (32,768 data points).
Trigger Modes Can be triggered internally, automatically on the VOD signal from the blast. Can be
triggered externally from a break-wire, which also allows multiple HandiTrap II™
VOD Recorders to be time-synchronized for determining delay times between holes.
Power Internal rechargeable NiCd battery pack, which provides 8 hours of active operation
on a full charge. Full battery recharging is obtained overnight.
Components Provided HandiTrap II™ VOD Recorder, 120 or 230 VAC Battery Charger, USB Cable, colour
Operations Manual, HandiTrap II™ VOD Recorder Advanced Analytical Software for
Windows®.
Size and Weight 12 x 6.5 x 4 cm (4.7 x 2.6 x 1.6 in.) 0.3 kg (0.7 lbs.).
Environmental Operates at -40 to +80 C (-40 to +185 F). Snow, rain, dust and sand proof. Drop
proof from at least a 1 m (3 ft) height.
PC Connection At any time after recording, the Operator can connect the HandiTrap II™ VOD
Recorder to a computer’s USB to download and view the VOD data on a computer
within 50-75 seconds.
VOD Excitation/Safety The HandiTrap II™ VOD Recorder’s excitation voltage is pre-set for the maximum 12
bit resolution across the VOD PROBEROD or VOD PROBECABLE-HT in the explosives.
All VOD operating parameters are automatically recorded by the HandiTrap II™
VOD Recorder with no requirement for additional instruments. The HandiTrap II™
VOD Recorder is physically unable to output as much as 50 mA of current to a VOD
PROBEROD or VOD PROBECABLE-HT. The HandiTrap II™ VOD Recorder does not rely
on “current limiting automatic fault checking systems” which may potentially fail.
VOD PROBERODS 1 m (3.3 ft.) long rigid resistance probes for use in explosive samples with the
HandiTrap II™ VOD Recorder.
VOD PROBECABLE-HT 30 m (100 ft.) long spool of ready-to-use resistance wire for use with the HandiTrap
II™ VOD Recorder to determine the VOD of explosives loaded into a blasthole and
the delay time between decks of explosives in a blasthole.

15
Chapter 4
Recording VODs
and Deck Delays
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4.1 Safety Considerations for Selecting an Explosive Testing Site
Care must be taken to select a good site for detonation and recording VOD of explosive samples. If possible, a permanent test site may
be constructed. A pit surrounded by an earth wall is typically sufficient for smaller detonations. Additionally, a protected shelter for the
HandiTrap II™ VOD Recorder and personnel can be constructed at an appropriate distance from the explosive. The distance will depend on
the amount of explosive being detonated at one time, and how the explosives are confined (be aware of steel shrapnel from confined shots).
Ensure that the area is well demarcated with the appropriate signage and that access is restricted.
If samples of explosives are to be detonated at an unprepared site, then the Operator must be careful when deciding upon what type of
ground the charges are to be placed. Avoid placement on ground with stones, rubble or anything that is likely to turn into a projectile. The
best surfaces are fines, sand or tailings.
It is always good practice to have maximum control over the time of firing of the test, therefore safety fuse initiation is not recommended.
Electric or shock tube initiation is best with the detonator either initiating the sample of explosives or the primer/booster in the explosive
sample.
STOP
Test the HandiTrap II™ VOD Recorder communications with your computer BEFORE first use in the field. Ensure that
Chapter 1 has been successfully completed. Most issues can be avoided by consulting the manual and/or contacting
MREL BEFORE recording valuable data with the HandiTrap II™ VOD Recorder.
STOP
Contact MREL for site specific recommendations for testing samples of explosives.
This Chapter provides detailed instructions on selecting a suitable site for testing sample
explosives, loading VOD PROBEROD and VOD PROBECABLE-HT and connecting the
Handitrap II™ VOD Recorder to record VODs and deck delay times.
Overview