Table of Contents
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D I G I T A L P A N E L M E T E R S
Universal Temperature Meters
Model PD750, PD751, PD752
Instruction Manual
• J, K, T, E, R, and S Thermocouples
• 100
Platinum RTD
• 10
Copper RTD
• 120
Nickel RTD
• Displays °F or °C
• Factory Calibrated for All Inputs
• Type T T/C and RTDs Displayed to 0.1°
• NEMA 4X, IP65 Front Panel
• 115 VAC, 230 VAC, or 24 VDC Power Options
• 2 or 4 Relays + 4-20 mA Output Option
UL Listed
(PD750 AC Powered Units Only)
¨
PRECISION DIGITAL CORPORATION
19 Strathmore Road • Natick MA 01760 USA
www.predig.com
Tel (800) 610-5239 • Fax (508) 655-8990
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Table of Contents
Related Manuals for Precision Digital Corporation PD750
Summary of Contents for Precision Digital Corporation PD750
- Page 1 • NEMA 4X, IP65 Front Panel • 115 VAC, 230 VAC, or 24 VDC Power Options • 2 or 4 Relays + 4-20 mA Output Option UL Listed (PD750 AC Powered Units Only) ¨ PRECISION DIGITAL CORPORATION 19 Strathmore Road • Natick MA 01760 USA www.predig.com...
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Page 2: Table Of Contents
Model PD750, PD751, PD752 Universal Temperature Meters Instruction Manual TABLE OF CONTENTS SPECIFICATIONS ...........4 OPTIONS . - Page 3 Model PD750, PD751, PD752 Universal Temperature Meters Instruction Manual ORDERING INFORMATION Type J, K, T, E, R, S, and 100 Platinum RTD : 115 VAC 230 VAC 24 VDC Options Installed Option Model Model Model Card* PD750-3-N PD750-4-N PD750-2-N No Options...
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Page 4: Specifications
Model PD750, PD751, PD752 Universal Temperature Meters Instruction Manual SPECIFICATIONS Basic Meter INPUTS: PD750: Field selectable: type J, K, T, E, R, or S Thermocouples with 1° resolution; type T to 0.1° 100 platinum RTD (.00385 or .00392 curve) to 1° or 0.1° resolution. -
Page 5: Options
Model PD750, PD751, PD752 Universal Temperature Meters Instruction Manual OPTIONS Relays RATING: 2 or 4 SPDT (form C); rated 2 Amp @ 30 VDC or 2 Amp @ 250 VAC resistive load; 1/14 HP @ 125 / 250 VAC for inductive loads. -
Page 6: Setup
Model PD750, PD751, PD752 Universal Temperature Meters Instruction Manual SETUP Programming and installing the meter involves six basic steps. Step 1 Remove jumper JP2 if installed, to disable the lockout feature. Step 2 Configure the input signal jumper JP1 according to the input type, thermocouple or RTD, see charts below. - Page 7 Model PD750, PD751, PD752 Universal Temperature Meters Instruction Manual POWER and SIGNAL CONNECTIONS for DC POWERED UNITS No Connection 22-28 VDC 22-28 VDC N H O N H O E + Ð E + Ð Four-Wire RTD Connections Three-Wire RTD Connections...
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Page 8: Programming
Model PD750, PD751, PD752 Universal Temperature Meters Instruction Manual PROGRAMMING The meter’s Single Button Scaling feature allows it to be programmed using only the ENTER button. The general procedure is to press the ENTER button to accept a flashing display or to wait for the display to scroll and press ENTER when the desired display appears. -
Page 9: Calibration Flow Chart
Model PD750, PD751, PD752 Universal Temperature Meters Instruction Manual CALIBRATION FLOW CHART The following flow chart illustrates a 2 point calibration using Single Button Scaling. The same general procedure is used for alarm set and reset point programming and 4-20 mA output programming. - Page 10 Model PD750, PD751, PD752 Universal Temperature Meters Instruction Manual CALIBRATION ((ALIb) The PD750 is pre-calibrated for 6 types of thermocouples and 2 types of 100 sensors. The PD751 is pre-calibrated for 10 copper RTD sensors and the PD752 is pre-calibrated for 120 nickel RTD sensors.
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Page 11: Input Type
Model PD750, PD751, PD752 Universal Temperature Meters Instruction Manual INPUT TYPE (TYPE) The meter must be programmed for the input type it is to accept. Selecting the wrong input type will cause an incorrect temperature to be displayed. Selecting Input Type 1. -
Page 12: Type
Model PD750, PD751, PD752 Universal Temperature Meters Instruction Manual RECOMMENDED CALIBRATION POINTS Type Type of Input Input 1 Input 2 Check Number (Low) (High) (Middle) Type J T/C 32°F 1182°F 600°F Type K T/C 32°F 1183°F 960°F Type T T/C 32°F... -
Page 13: Alarm Points
Model PD750, PD751, PD752 Universal Temperature Meters Instruction Manual 4 ALARM POINTS (Alars) The meter is equipped with 4 alarm points as a standard feature. Each alarm may be programmed for either a high or low alarm and for 0-100% deadband. Front panel LEDs indicate alarm status. - Page 14 Model PD750, PD751, PD752 Universal Temperature Meters Instruction Manual 5. If the flashing digit is OK, press ENTER before it scrolls. If not OK, wait for digit to scroll. 6. When digit is OK, press ENTER. Program remaining digits in same fashion.
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Page 15: Fail-Safe Operation
Model PD750, PD751, PD752 Universal Temperature Meters Instruction Manual FAIL-SAFE OPERATION: The relay coils are energized in the non-alarm condition. In the case of a power fail- ure, the relays will go to the alarm state. The fail-safe operation can be disabled by removing jumper J2 located at the front of the relay option card. -
Page 16: Relays (Optional)
Model PD750, PD751, PD752 Universal Temperature Meters Instruction Manual RELAYS (Optional) The meter is available with 2 and 4 relays. The SPDT relays can be programmed for automatic or automatic + manual reset. The relays can also be programmed for 0-100% deadband. -
Page 17: Switching Inductive Loads
Model PD750, PD751, PD752 Universal Temperature Meters Instruction Manual SWITCHING INDUCTIVE LOADS The meter has the ability to suppress electrical noise generated by switching induc- tive loads. However, installing suppressors improves this performance even more and prolongs the life of the meter’s relay contacts. -
Page 18: Isolated 4-20 Ma Output Option ( )
Model PD750, PD751, PD752 Universal Temperature Meters Instruction Manual ISOLATED 4-20 mA OUTPUT OPTION (OvtPvt) The meter can be equipped with an isolated 4-20 mA output signal option that can be programmed to produce a 4-20 mA output for virtually any input. - Page 19 Model PD750, PD751, PD752 Universal Temperature Meters Instruction Manual 4 mA Output Calibration 1. Press ENTER, when appears press ENTER again. OvtPvt 2. All digits flash for 3 seconds, a green LED labeled “4” illuminates indicating the flashing display is the value at which the meter will produce a 4 mA output.
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Page 20: Lockout
Model PD750, PD751, PD752 Universal Temperature Meters Instruction Manual Programming Confirmation The values that have been programmed to produce the 4 and 20 mA outputs can be quickly checked to make sure they are the desired values. To do this, enter the... - Page 21 Model PD750, PD751, PD752 Universal Temperature Meters Instruction Manual OPTIONS CARD REMOVAL & INSTALLATION Meter options are installed at the factory. To disable relays’ fail-safe operation, it is necessary to remove the Boards from the case. Refer to the following instructions and illustrations.
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Page 22: Mounting Dimensions
Model PD750, PD751, PD752 Universal Temperature Meters Instruction Manual To re-install the meter in its case: 1. Fold the Options Board over the Main Board, grasp both boards so the Main Board is on the bottom and the two Boards are separated by about an inch. -
Page 23: Other Precision Digital Products
Model PD750, PD751, PD752 Universal Temperature Meters Instruction Manual Other Precision Digital Products MODEL DESCRIPTION PD118 MINIMUX 8 Point Scanner ® PD141AFO VIGILANTE four Point Annunciator with First-Out ® PD202-253 Digital Pressure Gauges PD602 Dart Low-Cost 1/8 DIN Process Meter... - Page 24 Model PD750, PD751, PD752 Universal Temperature Meters Instruction Manual How to Contact Precision Digital • For Technical Support please call: (800) 610-5239 or (508) 655-7300 fax: (508) 655-8990 e-mail: support@predig.com • For Sales Support or to place an order please...
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