Shand & Jurs 92021 Cover Position Indicator

For wastewater plant operators and biogas facility managers responsible for floating-cover monitoring on vertically or spirally guided digester covers, gas holders, and low-pressure biogas storage, the Shand & Jurs 92021 provides direct mechanical indication of cover position.

Unlike gaugeboards, counterweight systems, or powered-only indication, the 92021 uses proven tape-and-cable gaugehead mechanics to translate cover travel into a continuous, eye-level local readout that operators can monitor at the point of operation without external power.

Inside the gauge, the Acutrak 90™ Cartridge Kit with a spring motor drum, power hub, and stainless-steel constant-power spring simplifies field maintenance. Delrin sheave pulleys route a 316 stainless-steel tape/cable assembly to the cover.

For vertically guided covers, two 90° pulleys route the cable; for spirally guided covers, a 45° pulley handles the rotation. An MCG 2000MAX 4-20 mA transmitter mounts on the gauge head for SCADA integration with two dry contact alarm relays.

Features

Converts actual floating-cover travel into a mechanical readout, confirming movement that pressure or level instruments may only imply.

Local position indication operates without external power, maintaining visibility during outages or whenever electronic instrumentation is offline.

Gaugehead-mounted mechanical counter displays cover position in feet and inches at eye level for routine checks and operator confirmation.

Spring motor drum, power hub, and stainless-steel constant-power spring inside the gauge head simplify field maintenance over long service life.

9399-13440 90° pulleys handle vertically guided covers; the 9399-13470 45° pulley routes the cable on spirally guided digester and gas-holder covers.

Optional 4-20 mA level transmitter with absolute magnetic technology mounts on the gauge head with up to two dry contact alarm relays for control-room visibility.

Applications

Digester Cover Position: Provides a direct mechanical reference for floating digester cover travel in wastewater treatment plants and biogas production facilities.
Gas Holder Monitoring: Confirms gas holder cover elevation and movement without requiring vessel entry or powered electronic instrumentation in the field.
Biogas Storage Systems: Supports operator visibility into cover position for low-pressure gas containment, leak troubleshooting, and routine operational checks.
Vertically & Spirally Guided Covers: Pulley accessory set adapts the 92021 to both vertical lift and spiral rotation cover geometries common in digesters and gas holders.
Remote SCADA Integration: MCG 2000MAX transmitter sends cover position to control rooms or plant monitoring systems with alarm relay outputs.
Backup Position Reference: Provides independent local indication when electronic level, pressure, or remote monitoring systems are unavailable or offline.

Specifications

Parameter

Specification

Product Type

Mechanical gaugehead-type cover position indicator

Primary Application

Floating cover position indication for S&J Biogas, digester, and gas-holder applications

Cover Configuration Support

Vertically guided covers (with two 9399-13440 90° pulleys) and spirally guided covers (with one 9399-13470 45° pulley)

Measurement Principle

Tape / cable mechanical motion tracking driven by floating cover movement

Indication Method

External mechanical numeric counter, feet and inches at eye level

Local Readout

Eye-level gaugehead-mounted mechanical counter

Typical Cover Service

Vertically and spirally moving floating covers; digester covers, gas holders, and biogas storage systems

Operation

Mechanical; no external power required for local indication

Standard Gauging Range

Up to 90 ft / 27.4 m (consult factory for extended ranges)

Internal Cartridge

Acutrak 90™ Cartridge Kit — spring motor drum, power hub, and stainless-steel constant-power spring

Materials of Construction

Cast-aluminum gauge head and sprocket wheels; Delrin sheave pulleys; 316 stainless-steel tape/cable assembly and constant-power spring; Delrin tape reels and storage hubs; ball bearings with Teflon seals

Standard Biogas Accessory Set

92021 gauge head + two 9399-13440 (90° pulleys, vertically guided covers) + one 9399-13470 (45° pulley, spirally guided covers) + cable clip

Optional Transmitter

MCG 2000MAX transmitter with infrared calibrator; two dry contact alarm relays; mounts on the gauge head via a 2-inch coupling in place of the counter housing cover

Gauge Head Shipping Weight

~46 lb

2026 COST ESTIMATE

Contact Support

If you have questions not covered here, please contact the Cognesense support team for assistance.

What is the 92021 Cover Position Indicator?

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The Shand & Jurs 92021 is a mechanical, gaugehead-type cover position indicator built for vertically or spirally guided floating digester covers, gas holders, and low-pressure biogas storage. It uses tape-and-cable mechanics to translate cover movement into an eye-level external counter that operators read at the point of operation without external power.

How does the 92021 help in biogas and digester applications?

It provides direct visual indication of floating cover movement, letting operators verify normal travel and identify binding, restricted movement, or abnormal behavior. This complements pressure and level instruments, which can only infer cover position from related process variables — and gives operators a power-independent reference for routine checks and troubleshooting.

Does the 92021 require external power?

No. Local indication is fully mechanical. The Acutrak 90™ Cartridge Kit — spring motor drum, power hub, and stainless-steel constant-power spring — drives the counter without electrical input, so the 92021 stays visible during outages, in remote installations without reliable power, and as an independent reference alongside powered electronic instrumentation.

How does the 92021 fit with S&J Biogas cover equipment?

The 92021’s mechanical platform and accessory ecosystem are naturally aligned with Shand & Jurs Biogas cover equipment for wastewater and renewable-gas facilities. Operators standardizing on S&J Biogas can specify the 92021 alongside cover gaskets, seals, and biogas-handling accessories as a coherent equipment set from one vendor.

How does the 92021 send cover position to a control room or SCADA?

The MCG 2000MAX 4-20 mA Magnetic Absolute Transmitter mounts on the gauge head in place of the counter housing cover via a 2-inch coupling. It outputs a 4-20 mA signal for SCADA integration, includes two dry contact alarm relays for high/low cover-position alarms, and features an infrared calibrator for field configuration.

What's the difference between vertically and spirally guided covers, and which accessories does each need?

Vertically guided covers move straight up and down; spirally guided covers rotate as they translate. The 92021 supports both with the right pulley set: two 9399-13440 90° pulleys for vertical lift, or a 9399-13470 45° pulley for spiral routing. Specify the cover configuration when ordering so the correct pulley set is included.

How does the 92021 fit alongside Varec gauges in the Cognesense portfolio?

The Cognesense portfolio uses brand-aligned lanes: the Shand & Jurs 92021 is the biogas / digester / gas-holder cover-position lead, while the Varec 2500 ATG family is the conventional oil & gas tank-gauging lead. The 92021 name carries naturally alongside S&J Biogas equipment; the Varec 2500 carries the long-established ‘Varec Gauge’ association in oil & gas.

What is the standard accessory set for a biogas installation?

For S&J Biogas service the standard kit is: one 92021 gauge head, two 9399-13440 90° pulleys (vertically guided) OR one 9399-13470 45° pulley (spirally guided), a cable clip, and the MCG 2000MAX 4-20 mA transmitter for SCADA. Optional add-ons include the Model JB3555-2 ventilator for corrosive-vapor service and the Model 9399-19000 flexible entry where roof movement is present.

92021 Cover Position Indicator