Despatch LND User Manual
C-187
PN 143377
REVISION I
2/2009
LND SERIES OVEN
WITH PROTOCOL
PLUS
INSTRUCTION MANUAL
™
Notice
Users of this equipment must comply with operating procedures and training of
operation personnel as required by the Occupational Safety and Health Act (OSHA)
of 1970, Section 6 and relevant safety standards, as well as other safety rules and
regulations of state and local governments. Refer to the relevant safety standards in
OSHA and National Fire Protection Association (NFPA), section 86 of 1990.
Caution
Setup and maintenance of the equipment should be performed by qualified
personnel who are experienced in handling all facets of this type of system.
Improper setup and operation of this equipment could cause an explosion that may
result in equipment damage, personal injury or possible death.
Thank you for choosing Despatch Industries. We appreciate the opportunity
to work with you and to meet your heat processing needs. We believe that
you have selected the finest equipment available in the heat processing
industry.
At Despatch, our service does not end after the purchase and delivery of our
equipment. For this reason we have created the Service Products Division
within Despatch. The Service Products Division features our Response
Center for customer service. The Response Center will direct and track your
service call to ensure satisfaction.
Whenever you need service or replacement parts, contact the Response
Center at 1-800-473-7373: FAX 1-952-469-8193.
Thank you for choosing Despatch.
Sincerely,
Despatch Industries
PREFACE
NOTE:
Read the entire
INTRODUCTION and THEORY
OF OPERATION before
installing the oven.
WARNING:
Failure to heed warnings in this
instruction manual and on the
oven could result in personal
injury, property damage or
death.
This manual is your guide to the Despatch oven. It is organized to give you the
information you need quickly and easily.
The INTRODUCTION section provides an overview
of the Despatch oven.
The THEORY OF OPERATION section details the
function and operation of assemblies and subassemblies on the Despatch oven.
The INSTRUCTIONS section provides directions on unpacking, installing, operating and
maintaining the Despatch oven.
The APPENDIX section contains Special Instructions
for operating the control instrument, a Troubleshooting Table, a list of Accessories and a Warranty.
An efficient way to learn about the oven would be to
read the manual while working with the corresponding
oven control system. This will give you practical
hands-on experience with information in the manual
and the oven.
Before operating the equipment, be sure you understand all of the technical information
contained in this manual. Information skipped, not understood or misunderstood could
create the possibility of operating the equipment in an unsafe manner. This can cause
damage to the oven or personnel or reduce the efficiency of the equipment.
i
Revision B: Corrected Sensor Calibration Page instruction, pages 38-39
Revision C: Modified per Rev C Protocol Plus software
Revision D: Update Despatch Warranty
Revision E: Update to Software Revision 4.0
Revision F: Revised Protocol Plus times. Updated Despatch address
Revision G: Revised warranty
Revision H: Revised Unpacking and Inspection Instructions
Revision I: Updated Control section.
ii
TABLE OF CONTENTS
INTRODUCTION .......................................................................................................................... 1
Special Features ............................................................................................................... 1
Specifications .................................................................................................................... 2
Dimensions ............................................................................................................ 2
Capacities .............................................................................................................. 2
Temperature .......................................................................................................... 3
Power .................................................................................................................... 4
THEORY OF OPERATION ........................................................................................................... 5
Inert Atmosphere Theory .................................................................................................. 6
OVEN INSTRUCTIONS ................................................................................................................ 7
Unpacking and Inspection ................................................................................................. 7
Set-up ................................................................................................................................ 8
Operating ........................................................................................................................ 11
Loading the Oven ................................................................................................ 11
Pre-Startup Checklist .......................................................................................... 12
Startup ................................................................................................................. 12
Automatic Nitrogen and Water Cooling ............................................................... 15
CONTROL .................................................................................................................................. 16
Theory of Control Operation ............................................................................................ 16
Operating Modes ................................................................................................. 18
Setup Mode ......................................................................................................... 18
Fast Start Mode ................................................................................................... 18
High Limit ............................................................................................................ 19
Indicators ............................................................................................................. 19
Displays ............................................................................................................... 20
Key Functions ...................................................................................................... 20
Outputs ................................................................................................................ 21
Relay (Continued) ............................................................................................... 22
Communication ................................................................................................... 22
Optional Software ................................................................................................ 22
INSTRUCTIONS ......................................................................................................................... 23
Start-Up ........................................................................................................................... 23
Operation ........................................................................................................................ 24
Manual Mode ....................................................................................................... 24
Timer Mode ......................................................................................................... 25
Profile Mode ........................................................................................................ 26
Auto Start Mode .................................................................................................. 26
Setup Mode ......................................................................................................... 27
Instructions for Setup Mode Pages ................................................................................. 28
Program Page ..................................................................................................... 28
Profile # ................................................................................................... 30
Sample Profile ..................................................................................................... 31
Auto Start Page ................................................................................................... 32
PID Page ............................................................................................................. 34
Control Page ....................................................................................................... 35
Communication Page (optional) .......................................................................... 36
Real Time Clock Page ......................................................................................... 36
Relay Outputs Page (optional) ............................................................................ 37
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Test Page ............................................................................................................ 38
Zone Calibration Page ......................................................................................... 39
Sensor Calibration Page ..................................................................................... 41
Enable Page ........................................................................................................ 43
Digital Inputs (optional) ........................................................................................ 44
Error Messages and Alarms ............................................................................................ 45
Quick Reference and Default Values .............................................................................. 46
Technical Specifications .................................................................................................. 53
MAINTENANCE .......................................................................................................................... 54
Checklist .......................................................................................................................... 54
Tests ............................................................................................................................... 55
Nitrogen Supply ............................................................................................................... 55
Replacement ................................................................................................................... 56
Parts .................................................................................................................... 56
Protocol Plus™ Instrument ............................................................................................. 57
Heater Unit ...................................................................................................................... 57
Fan Motor ........................................................................................................................ 58
TROUBLESHOOTING ................................................................................................................ 60
APPENDIX .................................................................................................................................. 62
Temperature Scale Conversion (C/F) ............................................................................. 62
Optional MRC5000 Recorder Setup ............................................................................... 63
iv
1
INTRODUCTION
This section provides an overview of the Despatch LND Series forced air oven. The
LND Series Ovens have the most effective heat distribution and the fastest processing
time of any lab oven their size. Air is discharged from the left side wall of the oven and
circulates through the chamber.
Special Features
• The sturdy construction and three inch insulation of the Despatch LND Series
ovens contribute to excellent temperature uniformity.
• Other special features include the following:
• Unique Despatch design to combine higher fan volume of forced recirculated air
with a system of perforated stainless steel walls for the ultimate in temperature
uniformity.
• Welded double wall construction and fiberglass insulation to reduce heat loss.
Silicone rubber gaskets further minimize heat leakage.
• Rapid response heater.
• Scratch-resistant baked enamel exterior and stainless steel interior for easy
cleaning.
• Purge and maintain valves and flowmeters for creating an inert gas atmosphere
in the oven chamber
• Water cooling coil for dissipating heat from the oven chamber
2
Specifications
Model
Chamber Size
in (cm)
Capacity
feet3
(liters)
Overall Size
in (cm)
Maximum
Number of
Shelf
Positions
W D H W D
H
LND 1-42
LND 2-11
LND 2-24
20
(50)
38
(96)
48
(122)
18
(46)
20
(50)
24
(61)
20
(51)
26
(66)
36
(91)
4.2
(120)
11.0
(310)
24.0
(680)
33
(84)
54
(137)
66
(166)
41
(104)
40.5
(103)
44.5
(113)
45
(114)
63
(160)
74
(188)
9
6
9
Model
LND 1-42
LND 2-11
LND 2-24
Maximum Load Lbs
Maximum Shelf Load Lbs
Recirculating Fan CFM
HP
Approximate Weight Net Lbs.
KG
Approximate Shipping Weight Lbs.
KG
150
30
300
1/4
380
173
510
232
180
60
1,000
1
745
339
1,045
475
300
100
1,500
2
1,065
484
1,465
666
Dimensions
Capacities
3
Temperature
Model
LND 1-42
LND 2-11
LND 2-24
Time to Temperature 25°C - 100°C
(approximate minutes with 25°C - 200°C
no load) 25°C - 343°C
6
25
56
5
14
32
3
12
30
Recovery Time Door Open 1 Min. 100°C
(approximate minutes with 200°C
no load) 343°C
<1
3
10
<1
2
7
<1
2
4
Temperature Uniformity at 100°C*
200°C*
343°C*
±1°C
±2°C
±3°C
±1°C
±2°C
±3°C
±1°C
±2°C
±3°C
Minimum Operating Temperature** with water cooling
(Approximate w/20 C ambient) without water cooling
55°C
97°C
55°C
100°C
60°C
110°C
Control Stability
±0.3°C
±0.3°C
±0.3°C
Repeatability
±0.5°C
±0.5°C
±0.5°C
Cooldown Time** 343 - 60°C
(approximate minutes with no load)
30
35
45
* Figures are based on actual tests in an empty oven. Uniformity can vary slightly depending on unit
and operating conditions.
** 60°F Supply water temperature at 120 GPH for LND1-42, 210 GPH for LND2-11 and LND2-24.
Minimum operating temperature is also affected by inert gas flow rate and temperature.
4
Power
Model
Volts
Amps
Hertz
Phase
Heater KW
LND 1-42
LND 2-11
LND 2-24
240*
208
240
480
208
240
480
15.6
29.8
26.1
13.1
52.4
46.0
23.0
50/60
60
60
60
60
60
60
1
3
3
3
3
3
3
3
9
9
9
16
16
16
Line voltages may vary in some geographical locations. If your line voltage is much
lower than the oven voltage rating, warm up time will be longer and motors may
overload or run hot. If your line voltage is higher than name plate rating, the motor may
run hot and draw excessive amps.
If the line voltage varies more than 10% from the oven voltage rating, some electrical
components such as relays, temperature controls, etc. may operate erratically.
Power Requirements
* Oven designed for 240 volts (see name plate on oven) will operate satisfactorily on a
minimum of 208 volts, but with a 25% reduction in heater power. If your power
characteristics are lower, contact Despatch Industries. An option is available to regain
the full heater power when operating on 208V.
5
THEORY OF OPERATION
Inert Gas
This section details the function and operation of assemblies and subassemblies on the
Despatch LND Series Ovens. These ovens have the most effective heat distribution
system and the fastest processing time of any lab ovens their size. They are especially
useful for testing, preheating, sterilizing, drying, aging and curing as well as other
production applications. Horizontal airflow with precision digital control delivers uniform,
fast processing. The overall result is efficient productivity under strenuous conditions.
Figure 1. Horizontal Airflow
The unique Despatch computerized design, moves forced convected heat through
perforated stainless steel walls. The air is recirculated with a high volume fan.
Despatch LND Series Ovens employ higher volume fans than any competitive model.
The chamber can be densely loaded without interfering with the process. The LND
series air delivery temperature is within 1/2° C of the number appearing on the digital
display. Nitrogen intake is regulated by separate purge and maintain panel-mounted
flowmeters. The cooling water flow is controlled by an adjustable valve and monitored
by a flowmeter located on the rear of the oven.
6
Inert Atmosphere Theory
WARNING:
This oven is not designed for use with
flammable material. If your process
involves flammable material see the LFD
series.
The goal of the inert atmosphere oven is to reduce oxygen concentration levels to an
acceptable level. This is accomplished by injecting an inert gas into the sealed
chamber. As the flow rate of inert gas into the chamber is increased, the chamber
becomes pressurized and gas is exhausted out the pressure relief valve located on the
back of the oven. Since oxygen is repelled by inert gas flow, the overall oxygen
concentration in the chamber is reduced.
However, there is a limit to the desired inert gas flow rate into the chamber. To
minimize the oxygen concentration level, you must minimize the number of exhaust
outlets. The only desired outlet is through the pressure relief valve. If the inert gas flow
rate is too high, other exhaust outlets will be formed (usually the door seal). In this
situation oxygen can penetrate back through the leak or outlet even though the chamber
is pressurized. This process is called diffusion. As diffusion is minimized, oven
performance is maximized.
7
OVEN INSTRUCTIONS
The INSTRUCTIONS section provides directions for unpacking, installation, operation
and maintenance of the LND Series oven.
Unpacking and Inspection
Remove all packing materials and thoroughly inspect the oven for damage of any kind
that could have occurred during shipment.
• See whether the carton and plastic cover sheet inside carton are still in good
condition.
• Look at all outside surfaces and corners of the oven for scratches and dents.
• Check the oven controls and indicators for normal movement, bent shafts,
cracks, chips or missing parts such as knobs and lenses.
• Check the door and latch for smooth operation.
If there is damage that may have occurred during shipment, follow these instructions.
1. Contact the shipper immediately and file a written damage claim.
2. Contact Despatch Industries to report your findings and to order replacement
parts for those that were damaged or missing.
3. Send a copy of your filed damage claims to Despatch.
4. Next, check to make sure you have received all the required materials. Your
shipment should include:
One (1) Despatch oven,
One (1) Instruction manual,
One (1) Warranty card,
Two (2) Shelves
5. If any of these items are missing from the packaged contents, contact Despatch
Industries to have the appropriate materials forwarded to you.
6. Finally, to protect the warranty on your new LND Series Oven, complete the
warranty card and mail it to Despatch within 15 days after receipt of the
equipment.
8
Set-up
WARNING:
Do not use the oven in wet,
corrosive or explosive
atmospheres unless this oven is
specifically designed for a
special atmosphere.
WARNING:
Use only inert gases.
WARNING:
All grounding and safety
equipment must be in compliance with applicable codes,
ordinances and accepted safe
practices.
1. Select the location for installing your oven.
The oven must have a minimum 2 inch
clearance in the rear to provide proper
ventilation. The oven may be placed next to
another cabinet, or next to another oven, with
a 3 inch clearance to insure proper ventilation.
Make sure oven is level and plumb; this will
assure proper heat distribution and operation
of all mechanical components.
2. Connect the nitrogen supply line to the inlet located on the oven rear panel and
marked nitrogen supply. The nitrogen supply to the oven must not exceed 80
PSI. (40 PSI on LND 1-42)
3. Check for leaks in the nitrogen supply line.
a. Turn the three-way nitrogen valve
switch to the OFF position.
b. Turn the PURGE flowmeter knob
clockwise to the OFF position.
c. Turn the MAINTAIN flowmeter knob clockwise to the OFF position.
d. Open tank valve on the nitrogen supply.
e. Set pressure regulator to about 40 PSI.
f. Check the nitrogen plumbing for leaks with a soapy water solution.
As nitrogen gas is odorless, all leaks should be
stopped to prevent the possibility of suffocation
in a small work area. Gas from a nitrogen leak
might leak might displace much of the oxygen
in the atmosphere.
4. If cooling is required, install water connection
for cooling coils.
9
Flowmeter
3-way Valve
Drain
Flow Valve
Cooling Water Supply
Cooling Coil
Vacuum
Breaker
Check
Valve
Drain
WARNING:
NEVER use the water cooling
coil without a gas flow into the
chamber. Not using inlet gas
during cooldown creates a
vacuum pressure which could
cause extensive damage to the
oven.
CAUTION:
Design the drain system to prevent operator injury from high temperature or pressure
buildup. Piping must be able to withstand short periods of up to 650 F (343 C)
temperatures. Drain lines should be insulated or warning labels installed that a hazard
exists.
WARNING:
Never allow drain to be plugged as a hot oven will generate a small amount of steam when
the water is first turned on. Steam burns.
Figure 2. Recommended Water Connection on Despatch LND Series Ovens
a. Make drain connections at the check
valve and 3-way valve.
b. Connect cooling water supply to the
flow valve.
c. Open 3-way valve and adjust flow
control valve for maximum flow.
d. Check for leaks.
10
e. Adjust flowmeter for desired flow rate. Consult the following chart for
300
200
100
0
0 10 20 30 40 50
Time
(minutes)
LND2-24
LND2-11
LND1-42
NOTE:
Cooldown rates are approximate. Load mass, inert gas flow and exhaust rates affect cool
down times.
cooldown rates.
f. Close 3-way valve. Make sure check valve is working properly by
monitoring water flow back through the cooling coil and out the drain port
of the 3-way valve.
Figure 3. Cool Down Rate with Water Cooling Coil (unit without a load).
5. Identify correct power source indicated on the specification plate.
6. On larger units, remove the control panel and the filter panel to expose the
7. Hard wire oven directly to the electric supply. On larger units the line connection
equipment mounting area.
is located on the equipment mounting panel.
11
Operating
WARNING:
Do not use oven in wet,
corrosive or explosive
atmospheres unless this oven is
specifically designed for a
special atmosphere.
WARNING:
Do not use flammable solvent
or other flammable material in
this oven. Do not process
closed containers of any
substance because they may
explode under heat.
Users and operators of this oven must comply with
operating procedures and training of operating
personnel as required by the Occupational Safety and
Health Act (OSHA) of 1970, Section 5 and relevant
safety standards, and other safety rules and
regulations of state and local governments. Refer to
the relevant safety standards in OSHA and National
Fire Protection Association (NFPA), Section 86 of
1990.
Loading the Oven
Despatch Industries cannot be responsible for either the process or process
temperature used, or for the quality of the product being processed. It is the
responsibility of the purchaser and operator to see that the product undergoing
processing in a Despatch oven is adequately protected from damage.
Carefully following the instructions in this manual will help the purchaser and operator in
fulfilling that responsibility.
When loading the oven avoid spills of anything onto the heater elements or onto the
floor of the oven. Do not place the load on the oven floor plate. This may cause the
load to heat unevenly and the weight may cause
shorting out of the heater elements. Use the shelves
provided.
The two shelves are designed to be pulled out about
half way without tipping. The support capacity of the
shelves is listed in the Capacities Table in the
Specifications section in this manual. Do not
overload the shelves.
Distribute the workload evenly so that airflow is not restricted. Do not overfill your oven.
The workload should not take up more than two-thirds of any dimension of the inside
cavity.
12
Pre-Startup Checklist
• Know the system. Read this manual carefully. Make use of its instructions and
explanations. Safe, continuous, satisfactory, trouble-free operation depends
primarily on your understanding of the system and your willingness to keep all
parts in proper operating condition.
• Check line voltage. Voltage must correspond to nameplate requirements of
motors and controls. Refer to the section on power connections in the
INTRODUCTION of this manual.
• Fresh air and exhaust. Do not be careless about restrictions in and around the
fresh air and exhaust openings and stacks. Under no condition permit them to
become so filled with dirt that they appreciably reduce the air quantity. The
proper ventilation clearances should be fulfilled at all times. Refer to the Set-up
instructions in this manual.
• Helpful hints
For drying ovens, open vent to prevent buildup of moisture.
For sample heating, close the vent when no ventilation is required.
Startup
For fastest oven heat-up time, close the fresh-air vent. After the desired temperature is
reached, the vent may be adjusted as needed.
1. Start Fan.
a. Open oven door.
b. Press Power switch to the On position. You will hear the recirculating fan
start.
c. Shut oven door.
d. Check that the control display turns on.
2. Adjust nitrogen flow rate.
a. Determine the desired oxygen level.
b. Use the following chart to determine the time to achieve the desired
oxygen level.
13
c. Turn the nitrogen valve switch to the PURGE position for the time to
20
12
8
4
0
16
0 4 8 12 16 20 24 28 32
achieve oxygen level as determined in step 2b.
Figure 4. Oxygen Level vs. Time at Maximum SCFH Purge Flow
d. When the purge is complete, turn the nitrogen valve switch to the
MAINTAIN position.
e. Use the charts on the next page to determine the MAINTAIN flowmeter
value to maintain the oxygen stabilization level.
f. Adjust the MAINTAIN flowmeter to the value determined in step 2e.
3. Operate the temperature control as desired by following the control operation
instructions that follow.
14
Figure 5. Nitrogen Leakage Rate vs. Oven Pressure
Figure 6. Oxygen Stabilization Level vs. Flow of Nitrogen
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