Celesco PT8000 Series · Heavy Industrial Cable-Extension Sensor · 4–20 mA / 0–20 mA output · 2–60 in. stroke
The Celesco PT8420 order code is PT8420 – RRRR – A B C – D E F G. Its A digit covers nine enclosure/tension combinations (aluminum, 303 SS or 316 SS × standard/medium/high tension), and G selects the cable guide. Example: PT8420-0020-221-1130 = 20-inch range, aluminum high-tension, Ø.047" bare stainless cable, 0–20 mA 3-wire output, 25 ft instrumentation cable, standard cable guide.
PT8420–0020–221–1130ModelRangeOptionsSignal / Connection
Order Code Table
R · Full Stroke Range
| Code | Meaning |
|---|
| 0002 | 2 in. (accuracy 1.00%) |
| 0005 | 5 in. (1.00%) |
| 0010 | 10 in. (0.18%) |
| 0015 | 15 in. (0.18%) |
| 0020 | 20 in. (0.18%) |
| 0025 | 25 in. (0.18%) |
| 0030 | 30 in. (0.18%) |
| 0040 | 40 in. (0.15%) |
| 0050 | 50 in. (0.15%) |
| 0060 | 60 in. (0.15%) |
A · Enclosure Material & Cable Tension
| Code | Meaning |
|---|
| 1 | Aluminum, standard tension |
| 5 | Aluminum, medium tension |
| 2 | Aluminum, high tension |
| 3 | 303 stainless steel, standard tension |
| 6 | 303 stainless steel, medium tension |
| 4 | 303 stainless steel, high tension |
| 8 | 316 stainless steel, standard tension |
| 7 | 316 stainless steel, medium tension |
| 9 | 316 stainless steel, high tension |
B · Measuring Cable
| Code | Meaning |
|---|
| 1 | Ø.034" nylon-coated stainless rope — all ranges — general indoor use |
| 2 | Ø.047" bare stainless rope — 5/15/20/25/30 in. ranges — outdoor / debris / high temperature |
| 3 | Ø.058" PVC-jacketed vectra fiber rope — up to 30 in. — high voltage or magnetic field areas |
| 4 | Ø.031" bare stainless rope — 40/50/60 in. ranges — outdoor / debris / high temperature |
C · Reserved
| Code | Meaning |
|---|
| 1 | Fixed digit (reserved position) |
D · Reserved
| Code | Meaning |
|---|
| 1 | Fixed digit (reserved position) |
E · Output Signal
| Code | Meaning |
|---|
| 1 | 4…20 mA, 2-wire (8–34 VDC) |
| 2 | 20…4 mA, 2-wire (8–34 VDC) |
| 3 | 0…20 mA, 3-wire (14–29 VDC) |
| 4 | 20…0 mA, 3-wire (14–29 VDC) |
| 5 | 4…20 mA, 2-wire, intrinsically safe (CSA / Cenelec certified) |
| 6 | 20…4 mA, 2-wire, intrinsically safe (CSA / Cenelec certified) |
F · Electrical Connection
| Code | Meaning |
|---|
| 1 | 6-pin plastic connector with mating plug — IP67, NEMA 4X/6 |
| 2 | 10 ft. [3 m] waterproof cable — IP67, NEMA 4X/6 |
| 3 | 6-pin metal connector with mating plug — IP65, NEMA 4 |
| 4 | 25 ft. [7.5 m] instrumentation cable, 24 AWG shielded — IP67, NEMA 4X/6 |
| 5 | 100 ft. [30 m] waterproof cable — IP67, NEMA 4X/6 |
| 6 | 10 ft. [3 m] pressure-tested waterproof cable — IP68, NEMA 4X/6P |
| 7 | 100 ft. [30 m] pressure-tested waterproof cable — IP68, NEMA 4X/6P |
G · Cable Guide Option
| Code | Meaning |
|---|
| 0 | Standard nylon cable guide |
| 1 | Stainless steel cable guide |
| 2 | Polyurethane cable bellows |
| 3 | Integral cable brush |
Special Options & Notes
- VLS option: ordering code starts with VLS instead of PT (e.g. VLS8420-0060-111-1110) — Velocity Limiting System free-release protection. Not available with medium/high tension, stainless enclosure, bellows guide, or 2/5/15-inch ranges.
- Actual cable tension depends on range: e.g. standard tension is 13 oz at 30 in., 39 oz at 2 in., 16 oz at 50 in. See the PT8420 datasheet tension table.
Frequently Asked Questions
What does PT8420-0025-721-1453 mean?
A Celesco PT8420 with 25-inch stroke (0025), 316 stainless steel enclosure with medium cable tension (7), Ø.047" bare stainless measuring cable (2), 20–0 mA 3-wire output (4), 100 ft. waterproof cable (5) and integral cable brush (3).
What is the difference between PT8420 and PT9420?
Both are 4–20 mA cable-extension sensors. The PT8420 is the short-stroke heavy-industrial version (2–60 in.) with nine enclosure/tension combinations including 316 stainless steel and a cable-guide option; the PT9420 covers long strokes from 75 to 550 inches.
What is the VLS8420?
A PT8420 fitted with Celesco's Velocity Limiting System (VLS), which limits cable retraction to a safe 40–55 in./sec if the cable is accidentally released. Order it by replacing the PT prefix with VLS, e.g. VLS8420-0060-111-1110.
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