Dwyer Instruments 490A Catalog Page

SERIES 490A

HYDRONIC DIFFERENTIAL PRESSURE MANOMETER

Liquid and Gas Pressure Measurement, ±0.5% FS Accuracy

TEST & DATA

1-1/4

[31.75]

2-53/64 [71.73]

1/8 NPT

6-15/64 [158.27]

29/32

[22.86]

The Series 490A Hydronic Differential Pressure Manometer is versatile, hand-held, battery operated manometers available in several basic ranges for positive or positive differential pressure measurement and can tolerate most liquid media compatible with 316L SS.

A new feature added to the Series 490A is a eld adjustable damping, which allows the user to choose the level of display averaging rate corresponding to the uctuation

level common in many applications.

FEATURES/BENEFITS

• Seven user-selectable English and metric units

• Stores up to 40 readings for later recall

• Backlight for use in dim areas

• Digital dampening for low pressure - high resolution logging stability

• Automatic resolution adjustment for ner control

APPLICATIONS

• Chiller to coils for freeze protection

• Hydronic valve balancing

SPECIFICATIONS Service: Compatible gases and liquids. Wetted Materials: Without valve: 316L SS, -3V option: 316L SS, Buna-N, silicone,

grease, PTFE, brass 360, copper, reinforced acetal copolymer. Accuracy: ±0.5% FS, 60 to 78°F (15.6 to 25.6°C); ±1.5% FS from 32 to 60°F and 78 to 104°F (0 to 15.6°C and 25.6 to 40°C).

Pressure Hysteresis: ±0.1% FS. Pressure Limits: See chart. Electronic Temperature Limits: 32 to 140°F (0 to 60°C). Storage Temperature Limits: -4 to 176°F (-20 to 80°C). Display: 0.42˝ (10.6 mm) 4 digit LCD. Resolution: See chart. Power Requirements: 9 V alkaline battery, installed non-functional, user

replaceable.

Weight: 14.1 oz (400 g). Process Connections: Two 1/8˝ (3.18 mm) female NPT. Agency Approvals: CE.

• Measure pressure drop across pumps

• Refrigerant pressure testing

MODEL CHART

Portable

Model

Manometers,

490A-1 490A-2 490A-3 490A-4 490A-5 490A-6

Range psi

0 to 15.00 0 to 30.00 0 to 50.00 0 to 100.0 0 to 500.0 0 to 200.0

Available Pressure Units & Resolution**

1.034

15.00

30.54

103.4

415.2

2.069

3.447

6.895

34.47

13.79

30.00

50.00

100.0

500.0

200.0

61.08

101.8

203.6 1018

407.2

206.9

344.7

689.5 3447 1379

830.4 1384 2768 9999* 5536

775.7 1551 2585 5171 9999* 9999*

1034 2069 3447 6895 9999* 9999*

34.60

69.20

115.3

230.7 1153

461.3

Maximum Pressurebar psi in Hg kPa in w.c. mm Hg mbar ft w.c.

30 psig 60 psig 100 psig 200 psig 1000 psig

400 psig *Digits will display smaller units until all 4 digits are exceeded. **Readings less than 10% of range will provide one additional decimal place than shown for higher resolution.

OPTIONS

To order add sufx:

Description

-NIST Includes NIST Calibration traceable

certicate

Example: 490A-1-NIST

-3V 3-way vent valve with bleed screw rated

up to 100 psi

Example: 490A-1-3V

-3V option

3-way vent valve

ACCESSORIES Model Description A-47X-BOOT A-402A

Rubber boot for manometers (manometer no included) Carrying case, tough gray nylon pouch protects any Series 490A manometer, double zippered for quick and easy access, belt loop that snaps closed

A-HKIT-HOSES

One pair red & blue 60˝ SAE replacement hoses for the

490A-HKIT, each with integral ball valve

A-HKIT-500

Piercing gage adapter for the 490A-HKIT, 1/8˝ dia x 1-1/2˝ length

(2 per kit)

A-HKIT-500XL

Piercing gage adapter for the 490A-HKIT, 1/8˝ dia x 3˝ length

(2 per kit)

A-HKIT-510

Piercing gage adapter for the 490A-HKIT, 1/16˝ dia x 1-1/2˝

length (2 per kit)

NIST Calibration

Please contact your regional Dwyer distributor or Dwyer

International Sales Ofce for scheduling your NIST recertication

USA: California Proposition 65 WARNING: Cancer and Reproductive Harm - www.P65Warnings.ca.gov

A-47X-BOOT

(manometer not

included)

A-402A