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Series 475 Intrinsically Safe Handheld Digital Manometer
Ranges from 1" w.c. to 150 psid, ±0.5% Accuracy
The Series 475 Handheld Digital Manometer measures positive, negative, or differential pressures of air and natural gases in ranges from 1 in w.c. (0.249 kPa) to 150 psid (10.34 bar). The dual push pads on the front panel control the on/off, auto zero, and pressure unit selection, allowing for simple operation with no set up needed. When used with a Dwyer® Pitot tube, the Series 475 can also be used as an air velocity gage.
NIST CALIBRATION available in Product Configurator.
Product Applications
- Monitoring natural gas pressures on boilers and other combustion equipment
- Air velocity monitoring, when used with a Dwyer® Pitot tube and AV calculator
- Field calibration of other instruments
- Monitoring or troubleshooting HVAC systems
Models & Ordering
Specifications
- Service:
- Air and compatible combustible gases.
- Wetted Materials:
- Consult factory.
- Accuracy:
- ±0.5% Full Scale, 60 to 78°F (15.6 to 25.6°C); ±1.5% Full Scale 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% of Full Scale.
- Pressure Limits:
- See catalog page.
- Temperature Limits:
- 0 to 140°F (-17.8 to 60°C).
- Compensated Temperature Limits:
- 32 to 104°F (0 to 40°C).
- Storage Temperature Limits:
- -4 to 176°F (-20 to 80°C).
- Display:
- 0.42" (10.6 mm) 4-digit LCD.
- Resolution:
- See Ordering page.
- Power Requirements:
- 9 V alkaline battery, installed non-functional, user replaceable.
- Process Connections:
- Two barbed connections for use with 1/8" (3.18 mm) or 3/16" (4.76 mm) I.D. tubing. Two compression fittings for use with 1/8" (3.18 mm) I.D. x 1/4" (6.35 mm) O.D. tubing for 475-7 & 475-8 only.
- Weight:
- 10.8 oz. (306 g).
- Compliance:
- CE, FM approved to Class I, Div 2, Groups A, B, C, D, T4 Ta = 70°C.
Features
- Rugged aluminum case protects instrument from damage during transport/use
- Large, easy to read LCD and simple operation
- FM approved to be intrinsically safe in hazardous locations, Class 1, Div 2, Groups A, B, C, D, T4 Ta = 70°C
Options
- -AV Kit includes Model 475 Digital Manometer, Pitot Tube, two No. A-303 static pressure tips with magnetic mounting, 3/16" I.D. rubber tubing, No. A-397 step drill for 3/16" - 1/2" holes in 1/16" increments, No. A-532 AV slide chart, 9 volt battery, and fitted polyethylene case.
- -NIST NIST traceable calibration certificate
Accessories
| Model Number | Description | Usually Ships* | Price | Order | |
|---|---|---|---|---|---|
 |
A-472T | Kit, less manometer | Less Than 1 Week | $508.00 | Order |
 |
A-201 | Rubber latex tubing has less tendency to kink in storage and occupies less space, thus is best for portable work. 3/16" ID, 9' length. | Next Day | $9.80 | Order |
 |
A-303 | Portable static pressure tip, for 3/16" ID rubber or plastic tubing with 4" insertion. | Next Day | $13.00 | Order |
| A-375 | Compression fitting connections, 1/8" tube to 1/8" NPT male. | 1-2 Weeks | $5.20 | Order | |
 |
A-397 | Step drill. For fast, convenient installation of pitot tubes in sheet metal ducts. No center punch needed; automatic de-burring. Drills six sizes from 3/16"-1/2" in 1/16" increments. | 1-2 Weeks | $71.50 | Order |
| A-463 | Plastic carrying case with foam liner for 475-1-AV air velocity kit - 13-1/2" x 10" x 2-3/8". | 1-2 Weeks | $95.50 | Order | |
 |
A-532 | Air velocity calculator slide chart. | 1-2 Weeks | $13.50 | Order |
 |
166T | Telescoping pitot tube | Next Day | $319.00 | Order |
 |
166-6-CF | Pocket size Pitot tube, 1/8" dia., 6" insertion length, 3" tip, with 1/8" male NPT compression fitting. | Next Day | $154.75 | Order |
 |
A-402A | Carrying case for most manometers; tough, gray nylon pouch, double zippered with belt loop | Next Day | $54.50 | Order |
 |
A-47X-BOOT | Rubber boot for manometers (manometer not included). | Next Day | $17.00 | Order |
Model Chart
475-X-FM-OPT 475 MANOMETER
1ST SYMBOL (1ST X) RANGE
000 1.00 INWC / .249 KPA
00 4.00 INWC / .995 KPA
0 10.0 INWC / 2.49 KPA
1 19.99 INWC / 4.97 KPA
2 40.0 INWC / 9.95 KPA
3 199.9 INWC / 49.7 KPA
4 10.0 PSI / .689 BAR
5 19.99 PSI / 1.37 BAR
6 30.0 PSI / 2.07 BAR
7 100 PSI / 6.89 BAR NOT VALID W/ AV,T
8 150 PSI / 10.34 BAR NOT VALID W/ AV,T
OPTIONS (OPT) KITS
-NIST NIST TRACEABLE CALIBRATION CERTIFICATE
-AV AV KIT OPTION
-T TELESCOPING PITOT TUBE
SlideShare
Approvals
Drawings
Questions
- Question
- What's the sample rate of the 475 digital manometer series? Is there an average function of the the past samples?
- Answer
- The sample rate is 1 reading per second. There is no average function of past samples.
- Question
- Is there a manometer that is compatible with chlorine gas and sodium hydroxide (bleach)?
- Answer
- Unfortunately, we do not have any manometers available that can handle chlorine gas or sodium hydroxide (bleach).
- Question
- I have four Series 475 Mark III Handheld Digital Manometers that we have had for one year. I would like to have them calibrated, but I do not know where to send them. Do you offer a calibration service for the products you sell?
- Answer
- Yes, we provide NIST calibration for the 475 series both at the time of purchase and afterwards. Please contact one of our customer service representatives at 1-800-872-9141 and provide them with your model number(s).
- Question
- Does the 475 model work with propane?
- Answer
- The 475 is compatible with combustible gases and is FM approved.
- Question
- We use series 475-6-FM Mk III digital manometer. What is the recommended calibration interval?
- Answer
- We do not have an official recommended calibration interval. However, we would suggest checking the calibration at least once or twice a year depending on the applciation and how often the unit is used.
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