STRAIN GAUGE DIGITAL PANEL METER
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- 0-30 mV, 0-200 mV, ±15 mV,
±100 mV inputs
- 5, 10, or 24 VDC field selectable
excitation
- NEMA 4X, IP65 front panel
- 0.56" (14.2 mm) red LED display
- 4½ digits + extra zero
- Max display or peak hold feature
- Capture or programmable tare function
- 115 VAC power
- 2 or 4 relays + 4-20 mA output options
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GENERAL
FEATURES
The PD691 is a high performance, industrial-grade 4½
digit Strain Gauge Meter. It accepts all the standard
strain gauge and load cell signals: 0-30 mV, 0-200 mV,
± 15 mV and ± 100 mV and displays these
signals in engineering units on a 4½ digit display.
The display also includes an extra zero which may be used
to handle numbers up to ±199,99(0).
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Single
Button Scaling
Single Button Scaling means the PD691 can be completely
programmed using only one button. There are no complicated
menu trees to navigate or button-pushing sequences to
memorize. Simply press the ENTER button to initiate
the automatic menu scan. When the desired routine appears
press ENTER again. Once in a routine, press the
ENTER button when the display reads the desired
value. It’s that simple!
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To Set Tare:
Press ENTER when meter reads
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To Calibrate:
Press ENTER when meter reads
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To Program Alarms:
Press ENTER when meter reads
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NEMA 4X & IP65
Front Panel
Wet, dirty and dusty environments don’t
bother the PD691 NEMA 4X & IP65 front panel so it can
be installed in almost any panel in the plant. That means
plant operators can have the important information right where
they need it most, on the shop floor.
Bright Steady Display
for Big Numbers
The PD691 4½ digit + extra zero display is great for
displaying big numbers. Even when displaying large numbers,
the PD691 display is steady and quick responding. The extra
zero may be switched on to display ±19,999(0).
Field Selectable Excitation
Power Supply
The internal power supply can provide either 5, 10, or 24 VDC
power, (field select). Typical use for the 5 or 10 VDC supply
is to power a strain gauge. The 24 VDC supply may be used to
power the 4-20 mA output option. This standard feature saves
time and money by simplifying wiring and eliminating the cost
of an external power supply.
Peak Hold
The peak-hold feature captures the highest displayed value and
stores it in memory for later viewing. By entering the
 routine the operator can display
the peak value. a green LED labeled P
will illuminate indicating the display is showing the peak value.
Pressing the enter button again and entering the 
routine will cause the last stored peak value to be erased from
memory and a new peak value to be captured.
PD691 Indicating a Peak Hold Value
Tare
The PD691 can be set for either Capture or Programmable Tare.
Capture Tare sets a currently displayed reading to zero via
the front panel Tare button. The operator may reset Capture
Tare at any time in the field. Programmable Tare will automatically
subtract a set tare value from the actual reading. A green LED
labeled T will illuminate indicating
the display is showing a tared value.
PD691 Indicating a Tared Value
Ratiometric Operation
Ratiometric operation allows the meter
to compensate for small fluctuations in the excitation power
supply. A voltage drift of ±10% will not affect the display
value of the PD691 when in Ratiometric mode. Selecting normal
operation results in the unit not compensating for voltage fluctuations.
The display value will shift as the voltage changes.
4 Visual Alarms Standard
Every PD691 comes standard with 4 independent alarms. Each alarm
is easily programmed for high or low set point and 0-100% deadband.
Front panel alarm status LEDs assist in set/reset point programming
and are perfect for visual-indication-only applications. Options
are available for 2 and 4 relays.
Alarm/Relay Programming
Pressing the ENTER button when the display reads 
initiates a scan of the alarm set and reset points. First, the
display flashes Alarm #1 Set Point and indicates this by illuminating
the #1 LED and the “S” LED. This Set Point may be
changed using the ENTER button. Next the display flashes
Alarm #1 Reset Point and indicates this by illuminating
the #1 LED and the “R” LED. This Reset Point may
also be changed using the ENTER button. The remaining
Set and Reset Points are programmed in a similar fashion.
PD691 Alarm #2
Set Point is adjusted to 80000
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PD691 Alarm #2
Reset Point is adjusted to 20000
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Alarm Status Indication
When an alarm occurs, an LED will illuminate to indicate which
alarm has tripped. This LED will stay illuminated until the
meter returns to the non-alarm state.
PD691 indicating that Alarm #2
is in alarm condition.
Displaying non-linear signals is a snap with the linearization
feature. The user can input up to 11 calibration points and
corresponding displays to handle a wide variety of non-linear
signal applications.
OPTIONS
The PD691 Strain Gauge Meter can be equipped with options for
2 or 4 relay contacts and isolated 4-20 mA transmitter output.
These options may be combined in any configuration to satisfy
a wide variety of applications. In fact, a fully loaded model
PD691-3-18 includes linearization, 4 relays and isolated 4-20
mA transmitter output.
Relay Options
The PD691 is available with 2 or 4 SPDT relays. The relays are
rated 2 A @ 250 VAC, can be programmed for automatic reset or
automatic + manual reset, and for 0-100% deadband.
Isolated 4-20 mA Output
Option
The PD691 can be equipped with an isolated 4-20 mA output signal
option that can be programmed to produce a 4-20 mA output signal
for virtually any input. The 4-20 mA output signal can be powered
either by the internal or an external power supply. If the internal
power supply is used for the 4-20 mA output, it is not available
to power a strain gauge.
The 4-20 mA output provides 500 VDC or peak AC, input-to-output
or input/output-to-power isolation.
Notes:
1. Alarm acknowledgement terminals (ACK and COM) located on
the main board.
2. In alarm condition, NC contact is connected to common in
the fail-safe mode.
Mounting Dimensions
Notes:
1. Panel cutout required: 1.772″ x 3.622″ (45
mm x 92 mm) 1/8 DIN
2. Panel thickness: 0.125″ - 0.250″ (3.17 mm -
6.34 mm)
3. clearance: allow 6 inches (152 mm) behind the panel
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Power Supply Wiring Diagrams
The internal power supply can provide either 5, 10, or 24 VDC.
Relays
Rating: 2
or 4 Form C (SPDT); rated 2 A @ 30 VDC or 2 A @ 250 VAC resistive
load; 1/14 HP @ 125/250 VAC inductive loads
Reset: User selectable
1. Automatic when the input passes the reset point.
2. Automatic plus manual (via user supplied switch).
Manual reset resets all manually resettable relays.
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Fail-Safe Operation: Relay coils are energized in non-alarm condition. In case of power failure, relays will go to alarm state. Failsafe may be disabled with internal jumper.
Auto Initialization: When power is applied to the meter, the relays will always reflect the state of the input to the meter.
Deadband: 0-100%, user selectable
Isolated 4-20 mA Transmitter Output
Scaling Range: Anywhere in range of meter, 501 count minimum span; reverse scaling allowed.
Accuracy: ±0.1% FS ±0.004 mA
Output Loop Resistance:
| | Loop Resistance |
| Power supply | Minimum | Maximum |
| 24 VDC | 10 Ω | 600 Ω |
| 35 VDC (external) | 600 Ω | 1000 Ω |
Isolation: 500 V input-to-output or input/output-to-24 VDC supply
External Loop Power Supply: 35 VDC maximum
SPECIFICATIONS
Except where noted all specifications apply to operation at +25°C.
General
Inputs: Field selectable: 0-30 mV,
0-200 mV, ±15 mV ±100 mV
Display: 0.56" (14.2 mm) red LED, 4½ digits +
extra zero may be switched on to display ±19,999(0)
Accuracy: 0.05% FS ±1 count
Ratiometric Operation: Deviation less than 0.1% FS ±1
count, with±10% variation in excitation voltage
Zero Stability: 0.5 μV/°C
Span Stability: 0.005% FS/°C
Front Panel: NEMA 4X, IP65; panel gasket provided
Calibration Range: User programmable over entire range of
meter
Input Impedance: 20 kΩ
Sensor Power Supply: Isolated, selectable: 5 VDC or 10 VDC±5%
@ 50 mA; or 24 VDC ±5% @ 20 mA. Available for either strain
gauge input or 4-20 mA output option, but not both.
Max Display (Peak): Stored until reset by user or meter is
turned off
Max Display Indication: Front panel LED
Tare:
Capture Tare - Sets current display to Zero via front
panel TARE button.
Programmable Tare - Automatically sets TARE to a programmable
preset value.
Tare Indication:Front panel LED
Non-Volatile Memory: Settings stored for a minimum of 10
years.
Lockout: Switch 8 restricts modification of programmed settings.
Power Options: 115 VAC ±10%, 50/60 Hz,
10 VA
Isolation: 1500 VAC
Normal Mode Rejection: 64 dB at 50/60 Hz
Operating Temperature: 0 to 60°C
Storage Temperature: -40 to 85°C
Relative Humidity: 0 to 90% non-condensing
Enclosure: 1/8 DIN, high impact plastic, UL 94V-0, color:
black
Weight: 19.7 oz (559 g) (including options)
Connections: Removable screw terminals accept 12 to 22 AWG
Alarm Points: 4, any combination of high or low alarms
Alarm Status Indication: Front panel LED
Alarm Deadband: 0-100% FS, user selectable
UL File Number: E160849; 508 Industrial Control Equipment
Warranty: 2 years parts & labor
Extended Warranty: 1 or 2 years, refer to Price List for
details.
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ORDERING INFORMATION
The prices for the PD691 have been increased by $50 on October 5, 2009. Click here for alternative products
Products |
| Model |
Description |
Price |
| PD691-3-N |
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Strain Gauge/Load Cell Meter; No Options; Powered from 115 VAC |
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$309.00 |
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| PD691-3-14 |
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Strain Gauge/Load Cell Meter; 2 Relays; Powered from 115 VAC |
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$369.00 |
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| PD691-3-15 |
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Strain Gauge/Load Cell Meter; 4-20 mA Output; Powered from 115 VAC |
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$409.00 |
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| PD691-3-16 |
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Strain Gauge/Load Cell Meter; 2 Relays + 4-20 mA Output; Powered from 115 VAC |
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$469.00 |
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| PD691-3-17 |
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Strain Gauge/Load Cell Meter; 4 Relays; Powered from 115 VAC |
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$484.00 |
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| PD691-3-18 |
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Strain Gauge/Load Cell Meter; 4 Relays + 4-20 mA Output; Powered from 115 VAC |
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$539.00 |
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Enclosures |
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| Model |
Description |
Price |
| PDA2407 |
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Plastic NEMA 4X Enclosure for 1 Meter (Any Type) |
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$199.00 |
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| PDA2411 |
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Plastic NEMA 4X Enclosure for 2 Meter (Any Type) |
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$274.00 |
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| PDA2412 |
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Plastic NEMA 4X Enclosure for 3 Type A Meters |
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$304.00 |
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| PDA2414 |
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Plastic NEMA 4X Enclosure for 1 Type D + 1 Type A, B, C or E Meter |
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$274.00 |
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| PDA2415 |
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Plastic NEMA 4X Enclosure for 4 Type A Meters |
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$464.00 |
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| PDA2504 |
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Plastic NEMA 4X Enclosure for 4 Type A, B, C, or E Meters |
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$334.00 |
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| PDA2505 |
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Plastic NEMA 4X Enclosure for 5 Type A, B, C, or E Meters |
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$354.00 |
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| PDA2506 |
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Plastic NEMA 4X Enclosure for 6 Type A, B, C, or E Meters |
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$374.00 |
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| PDA2507 |
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Plastic NEMA 4X Enclosure for 7 Type A, B, C, or E Meters |
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$474.00 |
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| PDA2508 |
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Plastic NEMA 4X Enclosure for 8 Type A, B, C, or E Meters |
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$514.00 |
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| PDA2509 |
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Plastic NEMA 4X Enclosure for 9 Type A, B, C, or E Meters |
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$554.00 |
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| PDA2510 |
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Plastic NEMA 4X Enclosure for 10 Type A, B, C, or E Meters |
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$584.00 |
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| PDA2512 |
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Plastic NEMA 4X Enclosure for 2 Type A, B, C, or E Meters |
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$359.00 |
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| PDA2522 |
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Plastic NEMA 4X Enclosure for 1 Type D + 1 Type C Meter |
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$344.00 |
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| PDA2604 |
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Stainless Steel NEMA 4X Enclosure for 4 Type A,B, C or E Meters |
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$734.00 |
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| PDA2605 |
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Stainless Steel NEMA 4X Enclosure for 5 Type A,B, C or E Meters |
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$784.00 |
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| PDA2606 |
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Stainless Steel NEMA 4X Enclosure for 6 Type A,B, C or E Meters |
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$839.00 |
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| PDA2622 |
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Stainless Steel NEMA 4X Enclosure for 1 Type D + 1 Type C Meter |
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$499.00 |
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| PDA2704 |
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Steel NEMA 4 Enclosure for 4 Type A, B, C, or E Meters |
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$419.00 |
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| PDA2705 |
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Steel NEMA 4 Enclosure for 4 Type A, B, C or E Meters |
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$474.00 |
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| PDA2706 |
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Steel NEMA 4 Enclosure for 5 Type A, B, C or E Meters |
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$524.00 |
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| PDA2722 |
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Steel NEMA 4X Enclosure for 1 Type D + 1 Type C Meter |
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$329.00 |
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| PDA2811 |
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Low-Cost Plastic NEMA 4X Enclosure for 1 Meter (Type A, B, C or E) |
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$114.00 |
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| PDA2812 |
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Low-Cost Plastic NEMA 4X Enclosure for 2 Meters (Any type) |
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$159.00 |
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| PDA2821 |
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Low-Cost Plastic NEMA 4X Enclosure for 1 Type D Meter + 1 Type A, B, C or E Meter |
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$179.00 |
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DOCUMENTATION
The documentation can be downloaded from these links:
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