PD656
EXPLOSION-PROOF
DC INPUT INDICATOR

The PD656 is a Large Display Process Meter with flow rate, totalizer, and batch control capabilities. It accepts the common process signals such as 4-20 mA, 0-5 VDC, 1-5 VDC, and 0-10 VDC. It displays these signals in engineering units on a large, high efficienty, 4½ digit red LED display. The meter also provides two isolated 24 VDC power supplies to drive both the input and output loops. Options include up to 4 relays for alarms or batch controlling as well as an isolated 4-20 mA transmitter output.

MOUNTING

Enclosure contains four 7/16" holes for wall-mounting. 2" Pipe Mounting Kit available.

SPECIFICATIONS

Except where noted all specifications apply to operation at +25°C.

INPUTS  
Field selectable: 4-20 mA, 0-20 mA, 0-5 V, 1-5 V, 0-10 V

DISPLAY
Six digit, 0.8" (20.3 mm) high efficiency red LED, -19999(0) to 29,999(0) with selectable extra zero. Total: 0 to 999,999; automatic lead zero blanking

DECIMAL POINT
Process/rate display: Decimal point may be placed in any of the following positions: 2.9999, 29.999, 299.99, 2999.9, or 299990.

Total decimal point: 9.99999, 99.9999, 999.999, 9999.99, or 99999.9. Rate and total decimal points are independent of each other.

CALIBRATION RANGE
4 mA (1 V) input may be set anywhere in range of the meter. 20 mA (5 V) may be set anywhere in range of the meter above or below 4 mA input. An ERROR message will appear if input 1 signal and input 2 signal are too close together.

INPUT IMPEDANCE
Voltage ranges: greater than 300 kilohms
Current ranges: 100 ohms

LOOP POWER
Two isolated power supplies, 24 VDC ±5% @ 20 mA each, regulated. Maximum loop resistance is 1200 ohms.

LINEAR INPUT ACCURACY
±0.05% of calibrated span. ±1 count

ROOT EXTRACTION ACCURACY
±0.1% F.S. ± 2 counts

PROGRAMMABLE EXPONENT
From 1.0001 to 2.9999

ALARM POINT DEADBAND
0-100% of full scale, user selectable

ALARM STATUS INDICATION
Front panel LED

PEAK HOLD (DISPLAY PEAK)
Captures the peak process/rate and displays it via the front panel ENTER button.

PEAK HOLD INDICATION
Front panel flashing "R" LED

LOCKOUT
Jumper JP1 labeled "LOCK" restricts modification of calibration values.

NON-VOLATILE MEMORY
All programming values are stored in non-volatile memory for a minimum of ten years if power is lost.

NORMAL MODE REJECTION
64 dB at 50/60 Hz

POWER
AC power, 115 or 230 VAC (field select) ±10%, 50/60 Hz, 12 VA
DC Power, 22-28 VDC; 12 watts maximum

ENVIRONMENTAL
Operating temperature range: -20 to +65°C
Storage temperature range: -40 to +85°C
Relative humidity: 0 to 90% non-condensing

CONNECTIONS
Removable screw terminal blocks (provided), accept 22 to 12 AWG wire

RATE DISPLAY INDICATION
LED labeled "R" in lower right illuminates when meter is displaying rate or process input.

LOW-FLOW CUTOFF
Any input below the low-flow cutoff value will result in a display of zero. May be set from 1 count to 100% F.S., user selectable. To disable low-flow cutoff, program cutoff value to zero. Totalizer is based on rate display. So, inputs below the low-flow cutoff value will not affect the totalizer.

ALTERNATING DISPLAY
Display may be programmed to alternate between rate and total every 10 seconds.

TIME BASE
Second, minute, hour, or day

TOTAL DISPLAY
0 to 999,999, automatic lead zero blanking

TOTAL DECIMAL POINT
May be set in any of the following positions: 9.99999, 99.9999, 999.999, 9999.99, 99999.9. Total decimal point is independent of process/rate decimal point.

TOTAL CONVERSION FACTOR
Programmable from 0.00001 to 59999

TOTALIZER
Calculates total based on rate and field programmable multiplier to display total in any engineering unit.

TOTALIZER ROLLOVER
Totalizer "rolls over" when display exceeds 999,999. Relay status reflects display.

TOTALIZER PRESETS
Up to four, user selectable under Setup. Any set point can be assigned to total and may be programmed anywhere in the range of the meter.

PRESET OFFSET
Relays assigned to total can be programmed to trip at any point below the next relay’s preset value.

PROGRAMMABLE DELAY ON RELEASE
If the meter is programmed to reset total to zero automatically when the highest preset is reached, then a delay will occur before the total relays reset. This delay can be programmed anywhere from 1 to 999 seconds.

PRIORITY BATCH PROGRAMMING
This feature allows the user to quickly change preset values without going into the main menu by holding the ENTER button for more than 3 seconds.

TOTAL RESET
Via front panel ENTER button, external contact closure, or automatically via user selectable preset value.

TOTAL RESET LOCKOUT
Meter may be programmed so total can not be reset from front panel.

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. Built-in suppression.

ASSIGN TO PROCESS/RATE OR TOTAL
Any relay may be assigned to process/rate or total.

BUILT-IN SUPPRESSION
A built-in suppressor (snubber) to prolong the life of the relays protects each relay contact. The suppressor provides a degree of protection against electrical noise caused by inductive loads. Suppressor value: .01 µF/470 ohm, 250 VAC.

DEADBAND
0-100% of full scale, user selectable

HIGH OR LOW ALARM
User may program any alarm for a high or low trip point.

RELAY OPERATION
Latching or non-latching

FAIL-SAFE OPERATION
Relay coils are energized in non-alarm condition. In case of power failure, relays will go to alarm state. Fail-safe operation may be disabled, by removing jumper J5 located on the Options PCB.

AUTO INITIALIZATION
When power is applied, relays assigned to total will reflect the state of the accumulated total value in memory. Relays assigned to process/rate will reflect the state of the input to the meter.

PROCESS/RATE RELAYS RESET
Relays assigned to process/rate may be programmed to reset in any of the following ways:

ISOLATED 4-20 Ma TRANSMITTER OUTPUT

CALIBRATION RANGE
The transmitter output can be calibrated so that a 4 mA output is produced for any process/rate measured by the meter. The 20 mA output may correspond to any process/rate that is at least 501 counts greater or smaller than the process/rate corresponding to 4 mA. (Ex. 4 mA = 0, 20 mA = 501) If the span between 4 and 20 mA is less than 501 counts, an Error message will appear.

EQUIPMENT NEEDED
The 4-20 mA output from the meter is calibrated without the use of a calibrator.

OUTPUT LOOP-POWER
24 VDC ±5% @ 20 mA, regulated. Maximum loop resistance is 1200 ohms. Isolated from input loop-power.

ACCURACY
±0.1% F.S., ±0.004 mA

ISOLATION
500 VDC or peak AC, input-to-output or input/output-to-power line

EXTERNAL LOOP-POWER SUPPLY
35 VDC maximum

EXTENDED WARRANTY
Warranty may be extended an additional 12 months by returning the Product Registration Form within 2 months from date of purchase.

ENCLOSURE
Explosion-proof sand-cast aluminum, 0.3% max copper content, NEMA 3, 4, 7, 9. For use in hazardous locations Class I Groups C & D, Class II Groups E, F & G (suitable for Division 1 and Division 2). Two ¾" NPT holes provided at opposite sides. Up to four holes can be provided for an additional charge.

OVERALL DIMENSIONS
8.0" x 8.0" x 5.7" (203 mm x 203 mm x 145 mm)

WEIGHT
14.6 lbs (6.6 kg)

ORDERING INFORMATION

* Part number for Option Cards when purchased separately.

CONTROL STATIONS