7750S-23R-3

Pneumatic Column Indicator

7750S

Stainless Steel Case, 51 in. Scale, 1 Unit

Red

Scale information must be supplied when order is placed. Package includes overflow check valve and Swagelok fitting (1/4" tube × 1/4 NPT) compatible with copper or poly tubing.

Polyflo 1/4 in. Tube

Well-type manometer acts as a frictionless hydrostatic force-balance. A liquid fill is raised in direct proportion to the magnitude of pressure applied. (Varies based on type of indicating liquid employed)

Formed channel indicator housing; brushed Stainless Steel (Type 304). Heavy plate glass window; acrylic plastic window available as special order.

High Strength, Fully Annealed Glass (Pyrex® - Pyrex® is a registered trademark of Corning, Inc.)

Single Display Tube, Available in Wall Mount Housing Only

Multiple display tubes; 2-, 4-, 6-, 8-, 10-tube configurations. Tubes are spaced on 2-5/16" centerlines. Available in either wall mount or flush panel mount housing with front bezel assembly.

Infinite based on type of indicating liquid employed.

59-1/8 in

8838: Overflow Check Valve 1/4 in. National Pipe Thread (NPT) Gauge Connection

7461-2: Overflow Return Reservoir

4530-1-1-1: SafeGard Range 25 to 650 in. Water Pressure, None, 1/4 in. National Pipe Thread (NPT)

4530-1-2-1: SafeGard Range 650 to 1750 in. Water Pressure, None, 1/4 in. National Pipe Thread (NPT)

5181-1: Glass Tube Packing Seal Kit

• Nut, Quantity. 2
• Washer, Quantity. 2
• O-Rings, Quantity. 4

Note: This kit is part of Glass Tube Replacement Kit, P/N 5159-xx.

2992-8: Red Liquid No. 294, 8 fl oz.

2992-16: Red Liquid No. 294, 16 fl oz.

7083-20: Left and Right Side Pair, 20 in. Scale, 1-Unit

7083-35: Left and Right Side Pair, 35 in. Scale, 1-Unit

7083-43: Left and Right Side Pair, 43 in. Scale, 1-Unit

7083-51: Left and Right Side Pair, 51 in. Scale, 1-Unit

7083-66: Left and Right Side Pair, 66 in. Scale, 1-Unit

7084-20: Left and Right Side Pair, 20 in. Scale, 2-Units

7084-35: Left and Right Side Pair, 35 in. Scale, 2-Units

7084-43: Left and Right Side Pair, 43 in. Scale, 2-Units

7084-51: Left and Right Side Pair, 51 in. Scale, 2-Units

7084-66: Left and Right Side Pair, 66 in. Scale, 2-Units

5159-20: Glass Tube Replacement Kit, 20 in.

5159-35: Glass Tube Replacement Kit, 35 in.

5159-43: Glass Tube Replacement Kit, 43 in.

5159-51: Glass Tube Replacement Kit, 51 in.

5159-66: Glass Tube Replacement Kit, 66 in.

5181-1: Tube Packing Seal Kit

7560: Drain Plug

8806: Drain Plug Washer

7761: Reflector (Consult Factory)

1-1/2 in. National Pipe Thread (NPT) Tank Top Fitting (For 3/4 in. Pipe) Single Purge Line Connection with Tube Fitting
7746-13: Carbon Steel, Polyflo 3/8 in. Tube
7746-15: Carbon Steel, Swagelok 3/8 in. Tube
7746-18: 316 Stainless Steel, Swagelok 3/8 in. Tube

1-1/2 in. National Pipe Thread (NPT) Tank Top Fitting (For 3/4 in. Pipe) with single 1/4 in. National Pipe Thread (NPT) Purge Port Connection
2000FA: Carbon Steel
2000PA: Polyvinyl Chloride (PVC)
2000SG: 316 Stainless Steel

1-1/2 in. National Pipe Thread (NPT) Tank Top Fitting (For 3/4 in. Pipe) with Two 1/4 in. National Pipe Thread (NPT) Purge/Equalizer Connection
2000FA-2: Carbon Steel
2000PA-2: Polyvinyl Chloride (PVC)
2000SG-2: 316 Stainless Steel

The critical factor affecting accuracy of the indicator is the readout scale. KING-GAGE® scales are computer calibrated according to tank capacity curves (or from wet calibrations) to provide precise level indication for a specific tank. These scales can be graduated in practically any unit of measurement desired. In fact, 2-unit scales can provide a combination of weight, volume or depth indication. The size of the indicator (column height) is governed by the length of scale required. The combination of scale length and type of indicating liquid determines the actual pressure range of the indicator. Overall scale length can vary based on the range and resolution desired for the gauging application.

Three types of indicating liquid are available. Mercury (silver) is best suited for deep tanks such as silos and provides the maximum pressure range. No. 294 (red) provides excellent visibility and works for most typical tank applications. No. 175 (purple) is the lightest fluid and is generally used for shallow tanks or special applications.

Overall length of the scale can vary depending upon the range and degree of readability necessary for the application. This "readability" refers to the minimum readable change in liquid depth that can be observed at the indicator.

Three factors must be applied to determine scale length:
1 - maximum tank depth
2 - specific gravity (density) of tank product
3 - type of indicating liquid (scale factor)

A simple calculation using these factors will yield the minimum scale length required:
D (depth) x G (sp. gr.) x L (liquid scale factor) = Scale Length

The resulting value represents the scale sizes available for the type of indicator and select one that will accommodate the calculated length for your application.

Included as standard with all indicator packages.

Prevents escape of liquid through the top of the tube should the indicator be overpressured. This float-type check valve is included with either the KING-GAGE® or Multi-Tube Indicators.

This unit is an adjustable pressure-limiting control that prevents overpressuring of the indicator. Available as a separate component or can be ordered as part of a KING-GAGE® pneumatic sensor package.

Designed for use with mercury, this specially formulated liquid silicone imparts a non-stick coating to the inside of the glass tube. Simply place a few drops to the top of the mercury column to prevent unsightly deposits from forming that could obscure the display.

• Analog column easily conveys tank level
• Accurate and reliable hydrostatic balance principle
• Simple pneumatic operation (no electrical input)

KING-GAGE® Indicators are precision manometric instruments designed for continuous display of liquid level in storage or processing tanks. A vertical column of indicating liquid within a glass tube rises in direct proportion to the pressure applied. This analog display is read against a custom-calibrated scale graduated in one or more units of depth, volume, or weight of tank contents.

Working as a frictionless hydrostatic balance, these indicators have none of the mechanical parts common to most gauges. This makes the KING-GAGE® Indicator an inherently accurate and extremely rugged device. Used in conjunction with a pneumatic 1:1 output sensor, the indicator accepts a pressure signal that is directly proportional to tank depth.

Unlike electronic indicators or meters, KING-GAGE® pneumatic indicators are inherently safe. Even in areas designated continuous explosion hazard, there are no intrinsic safety devices required. These indicators are in use worldwide and have proven their dependability over decades of service.

Pneumatic column indicator has tube with liquid fill that rises in proportion to tank level. Graduated scale indicates corresponding weight, volume or depth of tank contents.

KING-GAGE® Indicator uses a pair of scales mounted on either side of the glass tube. 20 in. range scales in two units (pounds, gallons).

Multi-Tube Indicator has a single scale mounted behind the glass tube. 30 in. range marked in one unit (pounds).

All KING-GAGE®, a NOSHOK Company products are guaranteed to be free from defects in material and workmanship for one (1) year from the date of purchase.

Repair Services Warranty: 90 days limited warranty.