HEAT SHIELD
A perforated heat shield is attached to the outside of the furnace back, sides and door. This maintains a low external case temperature below 120F (50C).

HORIZONTAL DOOR
The door is a double pivoted horizontal door with thrust bearings for ease of operation. The double pivoting allows the hot face to be kept from the operator. There are four large manual turndown clamps for tight sealing. There are two overlapping gaskets for gas tightness. This door is typically used only because of overhead space limitations.

VARIOUS ELEMENT ALLOYS
The standard elements used are Nickel Chrome 80-20. These are good for furnaces rated to 2100F (1150C). On 2200F (1200C) furnace Iron-Aluminum-chrome alloy elements are used. On furnaces with a carbon rich atmosphere Chromel AA alloy elements are used.

SERPENTINE HEARTH TRAY
This is formed from bent sections of alloy, alloy flat bars and cross running round bars which hold it together. It is designed to expand and contract and can be turned over if it begins to sag.

ROLLER HEARTH
Alloy roller hearth with roller rails and cast alloy tray. Available on the smaller units only.

HYDRAULIC LOADER
A heavy duty loader will pick up the hearth tray by pivoting slightly in the back by means of a hydraulic cylinder actuated by a hand pump located on the loader. The loader can have two swivel wheels and two fixed wheels. Optionally, the wheel can be mounted on either inverted "V" tracks or railroad tracks embedded in the floor. All distances are engineered for precise and trouble free operation. The loader is typically designed to pick up the maximum rated load of the furnace. The loaders can be fitted with motorized drives.

FAN WATER COOLING SYSTEM
This is used typically when a water cooled fan or fans are employed. A manual ball valve shut off, flowmeter and regulating valve, and low flow switch are included plus hook ups for the inlet and outlet. The adjustable low flow switch alarm turns off element power and sounds an audible alarm.

INERT GAS PANEL
A flow control panel for inert gas operation has a manual shut off, regulator, pressure gauge, solenoid shut off, flowmeter and regulating valve.

ATMOSPHERE PANEL FOR NITROGEN/NATURAL GAS
This is ideal for neutral hardening applications. The MPN flow control panel for inert gas/natural gas (or propane) mixing is included. See the MPN Series Bulletin.

ATMOSPHERE PANEL FOR NITROGEN/HYDROGEN
This creates forming gas which is slightly reactive and is better at preventing oxidation than plain inert gas. The MPH flow control panel for inert gas/hydrogen mixing is included. See the MPH Series Bulletin.

FLAME CURTAIN
Automatically controlled flame curtain to reduce oxygen inrush and help maintain furnace temperature while door is open. Requires 1 PSI natural gas pressure. (Can be specified for propane also). Includes natural gas fed pilot light with its own regulator to prevent pressure feedback from flame curtain. Gas turns off automatically if pilot goes off. Includes electronic ignition which is activated from control panel. The flame curtain is activated when the door opens. The combustion air is powered by compressed air.

WATER OR AIR COOLED PANEL COOLING
A water or venturi-air cooled sealed control panel cooler is available for dusty environments. This replaces the standard filtered fan panel cooler.

SPECIAL ELECTRICAL COMPONENTS
All pilot lights, control relays and panel switches are made by Allen Bradley. General Electric or Cutler Hammer components can also be specified. NEMA rated electricals are available.

HONEYWELL UDC3000 PROGRAMMABLE TEMPERATURE CONTROL
Honeywell UDC 3000 microprocessor based digital program control includes one program with six soaks and six ramps.

MULTI PROGRAM PROGRAM CONTROLS
Various controls from Honeywell, Barber Colman, Eurotherm, Research Inc.Yokagawa and others are available. Contact factory.

PROGRAMMABLE MULTI-LOOP BARBER COLMAN CIMAC2 TEMPERATURE CONTROL SYSTEM
The Barber Colman Cimac 2 multi-loop controller has six loops of control, one for each zone. Each loop has a separate thermocouple input and outputs to a separate power control to control each zone individually. The setpoint programmer controls the setpoint of each loop. This programmer has up to 256 segments (soaks and ramps.) Each loop is a three mode control. There is a memory module which stores all programmed information separate from the control. The memory modules makes for unlimited program storage capacity.

CERTIFIED THERMOCOUPLES
Type K sealed in inconel protection tube. Atmosphere tight. These can be certified at 2 or more points of customer’s choosing. Certificates shall be provided with furnace documentation.

AUDIBLE AND VISUAL ALARM
The overtemperature control and the water flow alarm (if provided), when activated, will sound an audible piezo type alarm buzzer. There is a silence/acknowledge button. A pilot light, which also indicates the alarm condition, stays lit until the condition is cleared. A flashing light alarm indicator can also be ordered.

HONEYWELL DPR 3000 MULTIPOINT RECORDER
Honeywell Model DPR 3000 Digital Process Recorder can be supplied. Up to 32 pens. 250 mm (9.84") chart width. Completely programmable inputs, ranges, zones, messages (20 messages up to 30 characters each.) Accepts most thermocouple and RTD inputs. Six assignable colors. Sample rate of once every 5 seconds. Configuration in English. Alphanumeric display. Prints in tabular and/or trend mode (numbers or lines.) Accuracy up to 0.1%. Chart speeds programmable from .4 inches/hour to 196 inches/hour. Fan fold or roll paper. Optional communications, math pack, extra inputs and logic boards can be added later.

HONEYWELL DR450T ROUND CHART RECORDER
Model DR450T Honeywell Digital Circular Chart Recorder with two digital displays (one of actual temperature reading) and digital keyboard programming. 0.1% of span accuracy (typically better than 1F). The recorder prints its own charts. This allows complete configuration of charts scale and speed. You can focus on a small segment of temperature or look at the whole range and easily change back and forth without changing paper. No need for preprinted paper. 10" round chart. Microprocessor based. Chart Speeds of 8 hours, 24 hours, 7 days or "x" hours from 1 to 744. Programmable in Degrees F or C. Input filter included. Up to four pens.

THERMOCOUPLE JACK PANEL
A jack panel is included wired to recorder for thermocouples. The jack panel is located next to the survey port. This can include flexible thermocouples with plugs for the jack panel.

AMMETER/VOLTMETER
A digital ammeter/voltmeter combination made by Yokagawa shall be provided. This shall have a selector switch to allow operator to switch between each phase of the main power. When control power is set for manual 100% power it is possible to compare readings with a known reading to see if an element has failed.

IN HOUSE RUN OFF TESTING
The furnace will be completely tested in L&L factory up to maximum temperature. A nine point uniformity survey will run at several selected temperatures. Customer will be invited to witness the test. Prior to the final test the furnace will be cured and the controls tuned. Customer may witness test.

ON-SITE UNIFORMITY SURVEY
L&L will do a nine point uniformity survey on the furnace at several levels of temperature stabilization. L&L will provide the recorder, survey thermocouples and survey cage plus all labor. Case temperature can be recorded.

CALIBRATION AND CERTIFICATION
The recorder and all controls of the furnace will be checked against a standard potentiometer that has been recalibrated and recertified to NIST (National Institute of Standards and Technology) standards within the last 6 months.

START UP SERVICE
L&L will check out and leak test the atmosphere system, inspect the customer’s assembly of the furnace, check tightness of elements, start up equipment, tune controller, adjust SCR, instruct customer’s personnel in how to do this, train operator in the use of the control systems, review the furnace manual, test for proper operation of all components and systems and start, watch and run the bakeout cycle. This typically takes 2 to 3 days.