Fisher Scientific Isotemp 700 Series Manual
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Fisher Scientific Isotemp 700 Series Manual

Fisher Scientific Isotemp 700 Series Manual

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Isotemp
Gravity Models
Model 725G (Small)
Catalog # 13-247-725G & -726G
Model 737G (Medium)
Catalog # 13-247-737G & -738G
Model 750G (Large)
Catalog # 13-247-750G & -751G
95584 • 2/2/06
®
Premium Ovens
700 Series
Serial Number________________________
Forced Air Models
Model 725F (Small)
Catalog # 13-247-725F & -726F
Model 737F (Medium)
Catalog # 13-247-737F & -738F
Model 750F (Large)
Catalog # 13-247-750F & -751F

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Summary of Contents for Fisher Scientific Isotemp 700 Series

  • Page 1 Isotemp ® Premium Ovens 700 Series Gravity Models Forced Air Models Model 725G (Small) Model 725F (Small) Catalog # 13-247-725G & -726G Catalog # 13-247-725F & -726F Model 737G (Medium) Model 737F (Medium) Catalog # 13-247-737G & -738G Catalog # 13-247-737F & -738F Model 750G (Large) Model 750F (Large) Catalog # 13-247-750G &...

  • Page 2: Table Of Contents

    Table of Contents Introduction ................................ 3 Specifications ..............................5 Performance Characteristics ........................5 Electrical Requirements..........................6 Power Requirements ............................6 Chamber Volumes ............................6 Chamber Dimensions ..........................6 Installation ................................7 Selecting a Location ............................7 Unpacking ..............................7 Preparing the Oven ............................8 Power Switch ..............................8 Controls ................................9 Display ................................9 Keypad................................10 Operation ................................11 Safety Precautions ............................11...

  • Page 3: Introduction

    Introduction Fisher Isotemp 700 Series premium ovens are available in three sizes: small (Models 725F and 725G), medium (Models 737F and 737G) and large (Models 750F and 750G). All models provide PID Microprocessor control at operating temperatures ranging from 50°C (122°F) to 275°C (527°F).
  • Page 4 NTRODUCTION The silicon rubber gasket supplied with the oven is good for continuous use up to 250°C and intermittent use to 275°C. This gasket provides a better seal than the high temperature gasket and is supplied with is supplied with the unit.

  • Page 5: Specifications

    Specifications Performance Characteristics Operating Range 50 to 275° Average Uniformity @ 200°* Forced Air Models +/-3°C Gravity Models +/-4°C Control Resolution 1°C Control Sensitivity +/-0.5°C Recovery Time @ 200°C** Model 725F 1.0 minutes Model 725G 2.0 minutes Model 737F 2.0 minutes Model 737G 3.0 minutes Model 750F...

  • Page 6: Electrical Requirements

    PECIFICATIONS Electrical Requirements Models 725F & 725G Cat. No. 13-247-725F & -725G 120 V, 50/60 Hz Cat. No. 13-247-726F & -726G 240 V, 50/60 Hz Models 737F & 737G Cat. No. 13-247-737F & -737G 120 V, 50/60 Hz Cat. No. 13-247-738F & -738G 240 V, 50/60 Hz Models 750F &...

  • Page 7: Installation

    Installation Selecting a Location The oven requires an area approximately 2 ft x 2 ft. The bench selected must be capable of supporting at least 120 lbs for the Models 725F and 725G, 130 lbs for the Models 737F and 737G, or 135 lbs for the Models 750F and 750G.

  • Page 8: Preparing The Oven

    NSTALLATION Preparing the Oven Caution To prepare the oven for operation, perform the following See data plate on oven for voltage, procedures: current and line frequency specifica- Install the shelf. tions. Check that the power require- ments of the oven will not overload the Make certain all packing material has been circuit to which it will be connected.

  • Page 9: Controls

    Controls The following sections briefly describe the locations and functions of various display fields and keypad controls. More detailed descriptions are provided, when required, in the operating sections of the manual. Display The 700 Series controller features a bright, one-half inch LED numeric display which reads out the oven tempera- ture.

  • Page 10: Keypad

    ONTROLS Keypad The 700 Series incorporates a four-key, tactile keypad. The function of each key is discussed individually below. Figure 2: The Keypad Power °C Program Alarm Heat Increase Isotemp Oven Decrease Menu Pressing MENU while holding down the SET key decreases the oven set temperature, as indicated on the temperature display.

  • Page 11: Operation

    Operation The 700 Series ovens maintain a set temperature until that set temperature is changed. To set a temperature, perform the following: Place the power switch in the ON position. All 8s will flash as a test of the display. Press and hold the SET.

  • Page 12: Limit Alarms

    PERATION Limit Alarms The 700 Series controllers feature a deviation alarm which alerts the operator and and interrupts heater power whenever the actual oven temperature differs from the set temperature by more than 5°C. The set limit is built in to the controller and cannot be changed.

  • Page 13: Display Offsets

    PERATION Display Offsets The 700 Series controllers permit the operator to select a display offset Offsets temperature. With a display offset entered, the temperature displayed will be the actual oven temperature (measured at the control thermocouple) plus or minus the display offset selected. Functionally, the off- set feature permits the operator to measure and calibrate such that the display will indicate the temperature at a specific point or zone within the oven.

  • Page 14: Service

    Service Dept. at 1-800-395-5442. For technical assistance call 1-800-926-0505. Replacing the Door Gasket The Isotemp 700 Series ovens incorporate a durable, sili- cone door gasket to minimize heat loss. Should the gas- Caution ket become defective or be damaged, it may be replaced Allow oven to cool to ambient temper- by following the procedures below.

  • Page 15: Replacing The Door Hinges

    ERVICE replacement gasket around the corners of the liner to avoid bunching up of the gasket materi- Install a Phillips head screw as the gasket rounds each corner to keep the gasket properly stretched. (The screw goes through the liner, pierces the gasket and threads into the door wrap.) After all four corners are secured, install the...

  • Page 16: Adjusting The Door Cam

    ERVICE Adjust bottom nut (13/16) from end of shaft. Secure latch cover in place with two screws. Adjusting the Door Cam Caution Due to handling in shipment or to heat distortion with use, Allow oven to cool to ambient tempera- the door cam may require adjustment.

  • Page 17: Replacing The Heater

    ERVICE Prop up the oven front by placing a shim under each front foot. Use shims between one and one-half and two inches in thickness. Remove the screws securing bezel from bottom of oven. Slide the oven back on the table plus a few inches (to set the bezel on the bench) and rotate the bottom of the bezel out from the oven.

  • Page 18: Replacing The Cooling Fan

    ERVICE Remove the two nuts and shake proof washers securing the heater leads, then pull the lead ter- minals off the heater studs. Remove the two screws securing heater to cabi- net. Slide heater forward to disengage back heater clips, lift back of heater up, then slide heater back and lift out.

  • Page 19: Replacing The Controller

    ERVICE Locate the two electrical leads from the fan motor. Remove the leads from the push-on ter- Caution minal strip located in the front of the oven bezel. Sheet metal in this area is sharp. Work carefully. Lay the oven on its back with the oven bottom facing forward.

  • Page 20: Replacing The Solid State Relay

    ERVICE Check wiring connections against schematic, making sure that the line power wire is attached to the proper terminal, i.e., 120V or 240V. Check switch DS1 setting: If forced air, set switch A to ON, otherwise; set to OFF for gravi- ty.

  • Page 21: Replacing The Control Thermocouple

    ERVICE Remove two Phillips screws which mount the safe- ty relay to the bezel. Lift out the safety relay. Generally reverse the steps above to install the replacement safety relay and re-assemble oven. Replacing the Control Caution Thermocouple Allow oven to cool to ambient tempera- To replace a defective control thermocouple, proceed as fol- ture before attempting repair.

  • Page 22: Troubleshooting

    Troubleshooting This table is intended to assist in resolving oven problems by relating symptoms to their likely causes. The service discussed below is beyond the scope of most users and should be performed by qualified and trained personnel. In the event service is required beyond that available by the customer, contact Fisher Service Dept.

  • Page 23: Replacement Parts

    Replacement Parts Replacements for oven parts may be ordered, by part number, from Fisher Customer Service at 1-800-766-7000. Item Part Number (ref) Line Cord and Plug Model 725F & 725G (120 V) SPN 56636 (LINE) Models 737F, 737G, 750F, 750G (120 V) SPN 83903 Models 725F, 725G, 737F, 737G, 750F, 750G (240 V Int’l)

  • Page 24: Schematic

    Schematic...

  • Page 28: Warranty

    Warranty Laboratory instruments and equipment manufactured by Fisher Scientific Company L.L.C. – Laboratory Equipment Division (hereinafter called “the Company”) are warranted only as stated below. Subject to the exceptions and upon the conditions specified below, the Company agrees, at its election, to...

This manual is also suitable for:

Isotemp 725fIsotemp 725gIsotemp 737fIsotemp 737gIsotemp 750fIsotemp 750g

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