The Miljoco-Weiss TL40-600-4L is a Weiss utility pressure gauge with a 4″ dial, a 0-600 psi pressure range and a 1/4″ NPT lower connection.
The Weiss Series TL gauges are intended for general service conditions, for pressure or vacuum on air, oil, water, gas or other mediums that do not attack brass.
The TL40 is the 4″ dial size in the TL line.
Specifications on this page are taken from the Weiss General Service Gauges catalog (GSG-4/19). Verified 2026-09-11.
Warranty
Miljoco-Weiss warrants its products to be free from material defects in material and workmanship for 12 months from the date of shipment, or such other period as provided in the product documentation, per the published Miljoco-Weiss terms and conditions of sale (Section 15, Limited Warranty).
Key Features
Dual scale psi and kPa
White coated metal dial with black and red graduation lines and numerals.
Movement mounted on socket
All brass precision gear and pinion movement, mounted on the socket independent of the case.
Grade B accuracy
Rated to ANSI-ASME B40.1 Grade B over the middle third of the range.
Black drawn steel case
Drawn steel case in black finish with push-in polycarbonate window.
Technical Specifications
| Model | TL40-600-4L |
| Type | Utility pressure gauge |
| Ordering Code | Series TL40, range code 600, connection code 4L |
| Range | 0-600 psi |
| Graduations | Figure interval 50 psi, minor graduation 10 psi |
| Dial Size | 4″ |
| Case and Window | Drawn steel case, finished in black, with push-in polycarbonate window |
| Dial | White coated metal lithographed with black and red graduation lines and numerals, dual scale psi and kPa |
| Tube and Socket | Bronze tube, soft soldered to socket and tip; brass socket |
| Movement | All brass construction, precision gear and pinion, mounted on socket independent of case |
| Pointer | Balanced design, aluminum in black finish |
| Accuracy | 2% of the middle third of the entire range, ANSI-ASME B40.1 Grade B |
| Connection | 1/4″ NPT lower |
| Dimensions (in.) | A 3.90, B 1.26, C 2.80, D 0.40 |
Service note. Steam service gauges should be protected from excessive temperature by the installation of a coil type syphon (Cat. No. SY14-S iron or SY14-B brass).
Source Notes
Source note: Part number decode. The range and connection segments of this part number are decoded with the Weiss code convention published in the Weiss Stainless Steel Case Gauges catalog To Specify table (numeric code = 0 to that psi, VAC = 0-30 inHg vacuum, V code = 30 inHg vacuum to that psi, 4L = 1/4 in lower, 4B = 1/4 in back); this family's own documents do not print a code table.
Documentation
Related Products
Frequently Asked Questions
What range does the TL40-600-4L read?
0-600 psi. Figure interval 50 psi, minor graduation 10 psi.
What is the process connection?
1/4″ NPT lower.
How accurate is it?
The published accuracy for this series is 2% of the middle third of the entire range, ANSI-ASME B40.1 Grade B.
What are the wetted materials?
Tube and Socket: Bronze tube, soft soldered to socket and tip; brass socket.
Is there a service warning for this gauge?
Yes. For steam service the manufacturer specifies a coil type syphon (SY14-S iron or SY14-B brass) ahead of the gauge to guard against excessive temperature.
Manufacturer Warranty
Miljoco-Weiss warrants this product to be free from material defects in material and workmanship for 12 months from date of shipment, per the published Miljoco-Weiss terms and conditions of sale.
Warranty service requires written notice of the defect within seven days of discovery. Remedy is repair, replacement or credit at the manufacturer's discretion. Normal wear, corrosion, misuse and unauthorized modification are excluded.
- Type:
- Pressure Gauge
- Series:
- TL40
- Dial Size:
- 4 in
- Pressure Range:
- 0-600 psi
- Range Type:
- Pressure
- Connection Size:
- 1/4 in
- Connection Location:
- Lower
- Case Material:
- Steel
- Wetted Material:
- Bronze
- Fill:
- Dry
- Accuracy:
- Plus or Minus 2 Percent Middle Third
