Product Overview
Benchtop Digital Vacuum and Pressure Indicator, -30 to 30 Inches of Mercury, Three Selectable Units
Condition
Used, in fair condition from visual inspection; the carry handle is missing. Powered and given very basic testing with no problems to note. Markings legible: HEISE Digital Pressure Indicator, -30/30 IN HG, IN HG, IN H2O, PSI, On/Off, Zero and Unit Sel on the front; J10 and 100-220 VAC on the rear; nameplate HEISE INSTRUMENT DIVISION, 153 SOUTH MAIN ST. NEWTOWN CT. 06470, TEL. - (203) 426-3115, MODEL 901A, S/N S9-20557, INPUT 110 VAC 50/60 Hz 5VA MAX, RANGE -30/30 IN HG, OUTPUT OPTIONS ANALOG 0-5 VDC, 0-10 VDC, 4/20 mA, DIGITAL BCD, RS-232; red label DO NOT USE ON OXYGEN SERVICE; WARNING: A failure resulting in injury or damage may be caused by pressure beyond top of scale, excessive vibration or pressure pulsation, excessive instrument temperature, corrosion of the pressure containing parts, or other misuse. Refer to ANSI B40 or consult Dresser, Newtown, Ct. 06470.
Ships same or next business day from our Idaho warehouse. Selling online since 1999.
Product Overview
A Heise model 901A digital pressure indicator with a compound range of -30 to 30 inches of mercury, covering vacuum and positive pressure on one scale. A red LED readout shows the reading, and the Unit Sel button switches it between inches of mercury, inches of water and psi, each with its own lit legend. It runs on 110 VAC at 50/60 Hz and draws 5 VA at most.
Key Features
- Range: -30/30 inches of mercury, compound vacuum and pressure
- Display units: IN HG, IN H2O and PSI, chosen with the Unit Sel button
- Red LED numeric readout with a lit legend for the active unit
- Front-panel On/Off button and Zero adjustment
- Input: 110 VAC, 50/60 Hz, 5 VA max
- Rated full-span accuracy: plus or minus 0.07 percent
- Benchtop case with a capped fitting on the rear panel
Applications
- Reading vacuum on a bench line in inches of mercury, then switching to psi for the pressure side
- Reading low pressures in inches of water on a bench setup
- Keeping a spare readout on hand for a lab that already runs Heise indicators
Frequently Asked Questions
What range does it read?
From -30 to 30 inches of mercury, so it covers vacuum and positive pressure on one scale.
Can it display psi?
Yes. The Unit Sel button switches the readout between inches of mercury, inches of water and psi.
What power does it need?
110 VAC at 50/60 Hz, 5 VA max.
Does it come with its carry handle?
No. The carry handle is missing, and the unit is in fair condition from visual inspection. It was powered and given very basic testing with no problems to note. Flat-rate shipping in the lower 48, and orders over the free-shipping line ship free.
It lost its carry handle somewhere along the way, which leaves it a bench instrument by default. One press of Unit Sel and the same reading comes back in inches of mercury, inches of water or psi.
