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MODEL PD660 NEMA 4X 

LOW COST 3½ DIGIT LOOP-POWERED METERS

 MODEL PD661 EXPLOSION-PROOF 

• 

4-20 mA Input

• 

3½ Digit Display

• 

Loop-Powered Backlight Option

• 

Operates from -40 to 80°C

www.predig.com

PRECISION DIGITAL CORPORATION

SPECIFICATIONS

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

General

Input:

 4-20 mA @ 24 VDC maximum

Display:

 0.5" (12.7 mm) LCD, 3½ digits; 1999

Accuracy:

 ±0.1% FS ±1 count

Decimal Point:

 User selectable decimal point

Calibration:

 2 step; non-interacting zero and span

Calibration Range:

 4 mA input: -500 to +500; 

20 mA input: between 20 and 2000 above 4 mA display

Maximum Voltage Drop:

 1.5 VDC @ 20 mA; 

3.5 VDC @ 20 mA with backlight option

Display Update Rate:

 2.5/second

Loop-Powered Backlight Option:

 Factory installed only. Powered 

directly from the 4-20 mA loop, no batteries required. The display 
brightness will increase as the input signal current increases.

Connections:

 Removable screw terminals accept 12 to 22 AWG 

Operating Temperature:

 -40 to 80°C

Storage Temperature:

 -40 to 80°C

Relative Humidity:

 0 to 90% non-condensing

Approvals:

 The PD661-N-EX and PD661-B-EX are FM Approved 

& CSA Certified as explosion-proof for Class I, Division 1, 
Groups B, C, & D; dust-ignition proof for Class II, Division 1, 
Groups E, F, & G; and Class III hazardous (classified) locations.

PD660 Enclosure: 

Impact-resistant ABS plastic body, color: gray, clear 

polycarbonate cover with blue faceplate; NEMA 4X, IP67; ½" conduit 
hole provided at base. 

PD660 Weight: 

9.3 oz (264 g)

PD661 Enclosure:

 Explosion-proof, cast aluminum with glass window, 

0.3% max copper content, corrosion resistant polyester powder 
coating, color: safety blue. NEMA 4X, 7, & 9, IP66; FM Approved 
& CSA Certified: Class I, Division 1, Groups B, C, & D, Class II, 
Groups E, F, & G, Class III hazardous outdoor (Type 4X) locations. 
Two ½" NPT holes provided; mounts directly to conduit.

PD661 Weight:

 3.1 lb (1.4 kg)

Warranty: 

2 years parts & labor 

Extended Warranty: 

1 or 2 years, refer to Price List for details.

DISCLAIMER: The information contained in this document is subject to change 
without notice. Precision Digital makes no representations or warranties with 
respect to the contents hereof, and specifically disclaims any implied warranties 
of merchantability or fitness for a particular purpose.

ORDERING INFORMATION

Model

Description

PD660-N*

NEMA 4X Loop-Powered Meter

PD660-B

NEMA 4X Loop-Powered Meter with Loop-Powered Backlight

PD661-N*

Explosion-Proof Loop-Powered Meter

PD661-B

Exp-Proof Loop-Powered Meter with Loop-Powered Backlight

PD661-N-EX

FM Approved & CSA Certified Explosion-Proof Meter

PD661-B-EX

FM & CSA Exp-Proof Meter with Loop-Powered Backlight

*Quick Shipment Program product, shipped within 2 working days. 

Accessories

PDA6604

Panel Mounting Kit for PD660 (No NEMA 4X Seal to Panel)

PDA6845

2" Pipe Mounting Kit for PD660

PDA6845-SS

2" Pipe Mounting Kit Stainless Steel for PD660 

PDA-SSTAG

Stainless Steel Tag

®

YOUR LOCAL DISTRIBUTOR IS:

Services

PDN-CSETUP Custom 

Setup 

PDN-CAL

2-Point Calibration 

PDN-CERTCAL 

Certificate of Calibration 

PDN-CERTCAL2

Certificate of Calibration with Data

PDN-LTCAL

Lifetime Calibration with Annual Recert. - See Price List for Details

PDN-EXTWRNTY Extended Warranty Services - See Price List for Details

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