Precision Digital

1.0" High Red LED Universal Process Meter (Model PD655)

The PD650, PD655 and PD656 are Large Display Process Meters with flow rate, totalizer and batch control capabilities. Each accepts the common process signals such as 4-20 mA, 0-5 VDC, 1-5 VDC and 0-10 VDC and displays these signals in engineering units on a large, high efficiency, 4-1/2 digit red LED display. All units also provide two isolated 24V 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.

Features
Ordering Information
Specifications
Options

(Model PD655)

Two 24 VDC isolated transmitter power supplies
115 or 230 VAC field selectable power
Rate display in units per day, in addition to second, minute and hour
Programmable set points for latching and non-latching relay operation
Built-in snubbers on each relay contact
Any set point programmable for process/rate or total
Automatic square(1/2), 3/2 & 5/2 root extraction for weirs and flumes

Noise Filter

The field selectable noise filter allows the meter to be programmed so that an unsteady (noisy) input can be displayed with greater stability.

MODEL PD655 NEMA 4X 1.0" HIGH RED LED

115/230 VAC
MODEL

24 VDC
MODEL

Description

PD655-N	PD655-2-N	No Options
PD655-44	PD655-2-44	2 Relays
PD655-45	PD655-2-45	4-20 mA Output
PD655-46	PD655-2-46	2 Relays + 4-20 mA Output
PD655-47	PD655-2-47	4 Relays
PD655-48	PD655-2-48	4 Relays + 4-20 mA Output

OPTION CARDS
*MODEL*	*Description*

PD474	2 Relays
PD475	4-20 mA Output
PD476	2 Relays + 4-20 mA Output
PD477	4 Relays
PD478	4 Relays + 4-20 mA Output

Model: PD655

INPUTS:Field selectable: 4-20 mA, 0-20 mA, 0-5 V, 1-5 V, 0-10 V.
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, 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 Range	Minimum Difference Between Input 1 & Input 2:
0-5 V	0.16 V
0-10 V	0.32 V
4-20 mA	1.60 mA

INPUT IMPEDANCE: Voltage ranges, greater than 300 Kohms; 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.
11 POINT LINEARIZATION:

Input Range	Minimum Span Between Inputs
4-20 mA	(1.6 mA / (Number of points -1))
0-5 V	(0.16 V / (Number of points -1))
0-10 V	(0.32 V / (Number of points -1))

e.g. Minimum span for an 11-point, 4-20 mA calibration is 0.16 mA between inputs.

ALARM POINTS: Four, any combination of high or low alarms.

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. (Dspy p)

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 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: 0 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/Totalizer/Batch Controller Features

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.
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.
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. Relays assigned to total trip when total reaches the preset value and reset when total is reset to zero or when acknowledged manually. can be programmed so when the highest preset value is reached the total automatically resets to zero. In addition, a programmable delay on release of between 1 and 999 seconds can be programmed to reset the total relays after the delay has elapsed.
PRESET OFFSET: Relays that are assigned to total can be programmed to trip at any point below the next relay’s preset value. If preset offset mode is selected the corresponding relay will always trip at a programmed offset value before the next relay trips.
Example: Set Point 1 and 2 are setup for total, with Offset selected (under Set Point 2). If the preset offset is set at 10, (during Set Points programming for Set Point 1), then relay 1 will trip 10 counts before relay 2.
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 between 1 and 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.

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. Built-in suppression.
ASSIGN TO PROCESS/RATE OR TOTAL: Any relay may be assigned to process/rate or total.
BUILT-IN SUPPRESSION: Each relay contact is protected by a built-in suppressor (snubber) to prolong the life of the relays and provide a degree of protection against electrical noise caused by inductive loads. Suppressors value, .01 uF/470 ohms, 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.
Total relays reset:
1. When total is reset to zero, if setup for external total reset.
2. After delay has elapsed, if setup for internal total reset.
3. Manual any time, if setup for external total reset. Manual reset resets all manually resetable relays.
Process/rate relays reset: Relays assigned to process/rate may be programmed to reset in any of the following ways:
1. Automatic reset when the input passes the reset point.
2. Manual reset at any time (via user supplied external contact closure at terminals AK and CM or front panel ACK button.) Manual reset resets all manually resetable relays.
3. Automatic plus manual reset at any time. Relays will automatically reset when input passes the reset point. Relays can also be manually reset at any time (via user supplied external contact closure at terminals AK and CM or front panel ACK button.) Manual reset resets all manually resetable relays.
4. Manual reset only after alarm condition corrected. Relays can be manually reset only after alarm condition has been corrected (via user supplied external contact closure at terminals AK and CM or front panel ACK button.) Manual reset resets all manually resetable relays.

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 is calibrated without the use of a calibrator.
OUTPUT LOOP-POWER: 24 VDC ± 5% @ 20 mA, regulated. Maximum loop resistance is 1200 ohm. 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 max.
OUTPUT LOOP RESISTANCE:

Power supply	Minimum loop resistance	Maximum loop resistance
24 VDC	10 ohms	600 ohms
35 VDC (external)	600 ohms	1000 ohms

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