Watlow PM LEGACY PID Controller

Fits 1/32 or 1/16 DIN panel control where you need one universal input, PID or dedicated limit, and simplified menus versus PM PLUS.

Key advantages

Compact DIN sizes — 1/32 and 1/16 DIN panel footprints.
±0.1% of span accuracy — ±1 °C at calibrated ambient (Type S / cold Type T notes apply).
Flexible outputs — switched DC, OC, SSR, EM relay, NO-ARC 15 A (1/16 DIN), universal process 0–10 V / 4–20 mA.
Front seal — NEMA 4X / IP66 / IP67 (P3T armor); FM Class 3545 limit option.

Typical applications

OEM panels needing a simple PID or limit controller.
Retrofits replacing basic 1/32 or 1/16 DIN temperature controllers.
Machines that need optional NO-ARC 15 A load switching on 1/16 DIN.

Selection guide

Input / loops — 1 universal input (TC/RTD/process 4–20 mA or 0–10 V); up to 2 outputs; PID or dedicated limit configurations.
Accuracy — ±0.1% of span ±1 °C at calibrated ambient (Type S 0.2%; Type T below −50 °C 0.2%).
Output — Switched DC, open collector, SSR, EM relay, NO-ARC 15 A (1/16 DIN), universal process 0–10 V / 4–20 mA.
Supply — 85–264 VAC 47–63 Hz; or 20–28 VAC; or 12–40 VDC; 10 VA (1/32 & 1/16 DIN).
IP — NEMA 4X, IP66, IP67 front seal (P3T armor); IP2X touch-safe package.
Ambient — Operating −18…+65 °C; storage −40…+85 °C; RH 0–90% non-condensing.
Display / keypad — Dual 4-digit 7-segment LED; ~1 Hz update; SMOOTH TOUCH keypad.
Communication — Standard Bus; Bluetooth via EZ-LINK app.

Common mistakes

Ordering 1/32 DIN when the panel cutout is 1/16 (or the reverse).
Specifying 15 A NO-ARC on 1/32 DIN — NO-ARC 15 A is listed for 1/16 DIN.
Assuming Class 1 Div 2 on every unit — it is optional.
Mixing PID vs dedicated limit configurations without locking the order code.
Expecting the advanced feature set of PM PLUS — Legacy uses simplified menus.

When to RFQ / what to tell us

DIN size (1/32 or 1/16), PID vs limit, and input sensor/process type.
Output types (including whether ≤15 A NO-ARC resistive on 1/16 DIN applies) and load.
Supply (85–264 VAC / 20–28 VAC / 12–40 VDC).
Bluetooth / Standard Bus need; Class 1 Div 2 or FM limit marks if required.
Quantity, ship-to country. Compatible with Watlow PM LEGACY panels — we do not claim authorized-dealer status.

Request a Quote · Get selection help

Specs

Spec	Value
SKU	47797
Brand	Watlow
Model	PM LEGACY
Product type	other (temperature & process controller)
Measuring range	1 universal input (TC/RTD/process 4–20 mA or 0–10 V); up to 2 outputs; PID or dedicated limit configurations
Accuracy	±0.1% of span ±1 °C at calibrated ambient (Type S 0.2%; Type T below −50 °C 0.2%)
Output signal	Switched DC, open collector, SSR, EM relay, NO-ARC 15 A (1/16 DIN), universal process 0–10 V / 4–20 mA
Supply voltage	85–264 VAC 47–63 Hz; or 20–28 VAC; or 12–40 VDC; 10 VA (1/32 & 1/16 DIN)
IP rating	NEMA 4X, IP66, IP67 front seal (P3T armor); IP2X touch-safe package
Ambient temperature	Operating −18…+65 °C; storage −40…+85 °C; RH 0–90% non-condensing
Display	Dual 4-digit 7-segment LED; ~1 Hz update
Communication	Standard Bus; Bluetooth via EZ-LINK app
Approvals	cULus UL/EN/CSA 61010-1; UL 50 4X; CE; RoHS; WEEE; FM Class 3545 (limit); SEMI F47-0200; Class 1 Div 2 optional
Mounting	1/32 DIN or 1/16 DIN panel mount
Notes	SMOOTH TOUCH keypad; PID auto-tune; backwards-friendly simplified menus vs advanced PM PLUS.

Documents

Watlow PM LEGACY datasheet (PDF) — request the current OEM PDF on RFQ (no direct public PDF URL stored for this SKU).

FAQ

Q: PM LEGACY vs PM PLUS? A: Legacy is the simplified single-input PID/limit line (1/32 or 1/16 DIN). PM PLUS adds more loops/options. Pick by feature need, not name alone.

Q: What accuracy is published? A: ±0.1% of span ±1 °C at calibrated ambient; Type S 0.2%; Type T below −50 °C 0.2%.

Q: Can I get 15 A NO-ARC? A: NO-ARC 15 A is listed for 1/16 DIN configurations. Confirm load type and DIN size in the RFQ.

Q: What should I send for a quote? A: DIN size, PID vs limit, I/O map, supply, marks, quantity. Compatible with Watlow PM LEGACY — we do not claim authorized-dealer status.