Usage:
3608 (6MC1-Up),
3612 (9RC1-Up),
3616 (1PD1-Up)
Introduction
This instruction provides the necessary installation, set-up, and operating instructions required for the 9Y1784 (readout °C) or 7E0870 (readout °F) Digital Pyrometer.
The pyrometer is capable of monitoring nine separate temperatures using Type-K industry standard thermocouples. Typically, up to eight engine exhaust temperatures and the turbocharger inlet can be monitored.
For added engine protection, channel zero thermocouple input is continuously compared against a high limit setpoint selected by the operator. When the setpoint is exceeded, a switch is actuated to close a set of contacts, which is used as one of the inputs to the annunciator panel.
If more than eight cylinder exhaust temperatures are to be monitored, two digital pyrometers may be used.
| NOTICE |
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To avoid damage to the digital pyrometer, make sure you read and understand the instructions. |
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Deviation from these installation instructions may result in improper engine operation which could cause personal injury. |
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Reference: Parts Book, Service Manual, Electrical Schematic provided with your engine.
Material Required
9Y1784 Digital Pyrometer(s) for °C, or ...
... 7E0870 Digital Pyrometer(s) for °F.
- Mounting PanelType-K extension wireType-K ungrounded thermocouplesPlastic (non metallic) conduitRelay
Installation
Mounting
Mount the pyrometer(s) inside a control panel or to a suitable flat surface with the display at a convenient viewing height. The pyrometer fits an industry standard cutout for a round 114.3 mm (4.5 in) diameter gauge.
If the enclosure has a door, make sure that the face of the pyrometer(s) is set back far enough to ensure the door does not hit the push buttons.
NOTE: Avoid mounting the LCD (Liquid Crystal Display) in direct sunlight. The display temperature range is -40°C to 79°C (-40°F to 175°F). The setpoint switch function will operate over a range of -40°C to 85°C (-40°F to 185°F).
Wiring
Power
The pyrometer is designed to be powered by a 12 to 125 volt DC power source. Connect the power source to the pyrometer observing the correct polarity as indicated on the back of the pyrometer. Terminal 1, (-) minus connection, to be connected to power supply ground and terminal 2, (+) positive connection, to the power supply (+) positive.
NOTE: Make sure that the power source is adequately fused to minimize the possibility of damage should a failure occur. The power source should also be automatically switched so that power is available only when the engine is started and running.
Thermocouple
Channel "0" is used to monitor turbocharger inlet temperature. This thermocouple input temperature is continuously compared to the set point temperature setting selected by the operator.
Connect type K thermocouple extension wire from the turbocharger inlet thermocouple to channel "0" of the pyrometer. Connect the Red wire to the upper terminal and the Yellow wire to the lower terminal.
If channel "0" is not going to be used, connect a jumper wire across the input terminals at the rear of the pyrometer.
For six or eight cylinder (In-line) engines: Connect type K thermocouple extension wire from each thermocouple sensing source to the back of the pyrometer (cylinder 1 thermocouple to channel 1, cylinder 2 to channel 2, etc.). Connect the Red wire to the upper terminal and the Yellow wire to the lower terminal.
For twelve and sixteen cylinder (Vee-block) engines two pyrometers will be used. Connect all odd numbered cylinders (1-3-5-7-9-etc.) to one pyrometer, connect all even numbered cylinders (2-4-6-8-10-etc.) to the second pyrometer.
To insure an accurate signal to the pyrometer from the thermocouples, avoid any unnecessary junctions, splices, and contact with other metals. Take care not to damage the insulation of the thermocouple extension wire when installing, and protect from vibration, abrasion, or liquids in conduit.
Protect all thermocouple extension wiring by running the wires in conduit. Never run thermocouple wires in the same conduit that is used for ignition wiring or other high energy wiring such as AC power.
Keep secondary wires to high voltage wiring away from thermocouples and extension wiring.
Set Point Switch
Terminals 3 (- IN) and 4 (- OUT) directly below the "Switch" label, are the input and output of the solid state switching device. An over temperature condition on channel "0" actuates an internal normally open, solid state switch which has an open circuit breakdown voltage rating of 400 volts DC. The switch will also be activated if the thermocouple for channel "0" is not connected or becomes an open circuit. Do not leave the thermocouple input to channel "0" open. Connect either to a thermocouple or connect a jumper across the inputs.
To use the solid state switch contact as an input or alarm, etc., with a mechanical annunciator panel, we recommend that this contact be used to energize the 9Y2921 isolation relay.
Connect switch terminal 3 (- IN) to - VDC (negative).
Connect switch terminal 4 (- OUT) to relay terminal (86).
Connect +VDC to relay terminals (30) and (85).
Connect relay terminal (87) to annunciator panel input.
If the solid state switch contacts are not going to be used, leave terminal 3 (- IN) and terminal 4 (- OUT) connections open, but make sure that the thermocouple input to channel "0" is jumpered or connected to a thermocouple.
Operation
The pyrometer upon being powered up, will start reading the temperature of channel "0". To read the temperature readings of the other eight channels (1 through 8), push the "Push To Advance" switch located on the front panel. Each time the switch is actuated, the pyrometer readout will be incremented to the next channel.
Readout Selector Switch
The readout selector switch is located on the lower left side on the back side of the pyrometer. Set the toggle switch in the In-line position for 6 to 8 cylinder In-line engines.
For 12 to 16 cylinder Vee-block engines using two pyrometers, set the selector switch for one pyrometer to the Vee-even position, and the other pyrometer to the Vee-odd position to correspond to the thermocouple inputs to each pyrometer.
Set Point Adjustment
The high temperature limit setpoint for channel "0" is read by depressing the "Push To Read" button.
To adjust the set point, press the "Push To Read" button and adjust the Set Point potentiometer, using a small screwdriver, until the display readout matches the desired temperature. Turn the potentiometer clockwise to increase the desired temperature, or counterclockwise to decrease the desired temperature.
The output switch will be activated when channel "0" temperature readout exceeds the desired temperature setting as set above.
NOTE: The setting is retained until the potentiometer setting is changed.
Testing Thermocouple leads
Whenever it is necessary to check the thermocouple to terminal strip wiring using an ohmmeter or other test equipment, disconnect the wiring for the thermocouple to be tested at the back of the pyrometer. This will prevent damage to the pyrometer's sensitive low voltage detection circuitry.